This file is indexed.

/usr/lib/python3/dist-packages/gpxpy/gpx.py is in python3-gpxpy 1.1.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
# -*- coding: utf-8 -*-

# Copyright 2011 Tomo Krajina
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
GPX related stuff
"""

import logging as mod_logging
import math as mod_math
import collections as mod_collections
import copy as mod_copy
import datetime as mod_datetime

from . import utils as mod_utils
from . import geo as mod_geo
from . import gpxfield as mod_gpxfield

# GPX date format to be used when writing the GPX output:
DATE_FORMAT = '%Y-%m-%dT%H:%M:%SZ'

# GPX date format(s) used for parsing. The T between date and time and Z after
# time are allowed, too:
DATE_FORMATS = [
    '%Y-%m-%d %H:%M:%S',
    '%Y-%m-%d %H:%M:%S.%f',
    #'%Y-%m-%d %H:%M:%S%z',
    #'%Y-%m-%d %H:%M:%S.%f%z',
]
# Used in smoothing, sum must be 1:
SMOOTHING_RATIO = (0.4, 0.2, 0.4)

# When computing stopped time -- this is the minimum speed between two points,
# if speed is less than this value -- we'll assume it is zero
DEFAULT_STOPPED_SPEED_THRESHOLD = 1

# Fields used for all point elements (route point, track point, waypoint):
GPX_10_POINT_FIELDS = [
        mod_gpxfield.GPXField('latitude', attribute='lat', type=mod_gpxfield.FLOAT_TYPE, mandatory=True),
        mod_gpxfield.GPXField('longitude', attribute='lon', type=mod_gpxfield.FLOAT_TYPE, mandatory=True),
        mod_gpxfield.GPXField('elevation', 'ele', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('time', type=mod_gpxfield.TIME_TYPE),
        mod_gpxfield.GPXField('magnetic_variation', 'magvar', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('geoid_height', 'geoidheight', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('name'),
        mod_gpxfield.GPXField('comment', 'cmt'),
        mod_gpxfield.GPXField('description', 'desc'),
        mod_gpxfield.GPXField('source', 'src'),
        mod_gpxfield.GPXField('link', 'url'),
        mod_gpxfield.GPXField('link_text', 'urlname'),
        mod_gpxfield.GPXField('symbol', 'sym'),
        mod_gpxfield.GPXField('type'),
        mod_gpxfield.GPXField('type_of_gpx_fix', 'fix', possible=('none', '2d', '3d', 'dgps', 'pps',)),
        mod_gpxfield.GPXField('satellites', 'sat', type=mod_gpxfield.INT_TYPE),
        mod_gpxfield.GPXField('horizontal_dilution', 'hdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('vertical_dilution', 'vdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('position_dilution', 'pdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('age_of_dgps_data', 'ageofdgpsdata', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('dgps_id', 'dgpsid'),
]
GPX_11_POINT_FIELDS = [
        mod_gpxfield.GPXField('latitude', attribute='lat', type=mod_gpxfield.FLOAT_TYPE, mandatory=True),
        mod_gpxfield.GPXField('longitude', attribute='lon', type=mod_gpxfield.FLOAT_TYPE, mandatory=True),
        mod_gpxfield.GPXField('elevation', 'ele', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('time', type=mod_gpxfield.TIME_TYPE),
        mod_gpxfield.GPXField('magnetic_variation', 'magvar', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('geoid_height', 'geoidheight', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('name'),
        mod_gpxfield.GPXField('comment', 'cmt'),
        mod_gpxfield.GPXField('description', 'desc'),
        mod_gpxfield.GPXField('source', 'src'),
        'link',
            mod_gpxfield.GPXField('link', attribute='href'),
            mod_gpxfield.GPXField('link_text', tag='text'),
            mod_gpxfield.GPXField('link_type', tag='type'),
        '/link',
        mod_gpxfield.GPXField('symbol', 'sym'),
        mod_gpxfield.GPXField('type'),
        mod_gpxfield.GPXField('type_of_gpx_fix', 'fix', possible=('none', '2d', '3d', 'dgps', 'pps',)),
        mod_gpxfield.GPXField('satellites', 'sat', type=mod_gpxfield.INT_TYPE),
        mod_gpxfield.GPXField('horizontal_dilution', 'hdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('vertical_dilution', 'vdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('position_dilution', 'pdop', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('age_of_dgps_data', 'ageofdgpsdata', type=mod_gpxfield.FLOAT_TYPE),
        mod_gpxfield.GPXField('dgps_id', 'dgpsid'),
        mod_gpxfield.GPXExtensionsField('extensions'),
]

# GPX1.0 track points have two more fields after time
# Note that this is not true for GPX1.1
GPX_TRACK_POINT_FIELDS = GPX_10_POINT_FIELDS[:4] \
        + [ \
                mod_gpxfield.GPXField('course', type=mod_gpxfield.FLOAT_TYPE), \
                mod_gpxfield.GPXField('speed', type=mod_gpxfield.FLOAT_TYPE) \
          ] \
        + GPX_10_POINT_FIELDS[4:]

# When possible, the result of various methods are named tuples defined here:
TimeBounds = mod_collections.namedtuple(
    'TimeBounds',
    ('start_time', 'end_time'))
MovingData = mod_collections.namedtuple(
    'MovingData',
    ('moving_time', 'stopped_time', 'moving_distance', 'stopped_distance', 'max_speed'))
UphillDownhill = mod_collections.namedtuple(
    'UphillDownhill',
    ('uphill', 'downhill'))
MinimumMaximum = mod_collections.namedtuple(
    'MinimumMaximum',
    ('minimum', 'maximum'))
NearestLocationData = mod_collections.namedtuple(
    'NearestLocationData',
    ('location', 'track_no', 'segment_no', 'point_no'))
PointData = mod_collections.namedtuple(
    'PointData',
    ('point', 'distance_from_start', 'track_no', 'segment_no', 'point_no'))


class GPXException(Exception):
    """
    Exception used for invalid GPX files. Is is used when the XML file is
    valid but something is wrong with the GPX data.
    """
    pass


class GPXBounds:
    gpx_10_fields = gpx_11_fields = [
            mod_gpxfield.GPXField('min_latitude', attribute='minlat', type=mod_gpxfield.FLOAT_TYPE),
            mod_gpxfield.GPXField('max_latitude', attribute='maxlat', type=mod_gpxfield.FLOAT_TYPE),
            mod_gpxfield.GPXField('min_longitude', attribute='minlon', type=mod_gpxfield.FLOAT_TYPE),
            mod_gpxfield.GPXField('max_longitude', attribute='maxlon', type=mod_gpxfield.FLOAT_TYPE),
    ]

    __slots__ = ('min_latitude', 'max_latitude', 'min_longitude', 'max_longitude')

    def __init__(self, min_latitude=None, max_latitude=None, min_longitude=None, max_longitude=None):
        self.min_latitude = min_latitude
        self.max_latitude = max_latitude
        self.min_longitude = min_longitude
        self.max_longitude = max_longitude

    def __iter__(self):
        return (self.min_latitude, self.max_latitude, self.min_longitude, self.max_longitude,).__iter__()

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)


class GPXXMLSyntaxException(GPXException):
    """
    Exception used when the the XML syntax is invalid.

    The __cause__ can be a minidom or lxml exception (See http://www.python.org/dev/peps/pep-3134/).
    """
    def __init__(self, message, original_exception):
        GPXException.__init__(self, message)
        self.__cause__ = original_exception


class GPXWaypoint(mod_geo.Location):
    gpx_10_fields = GPX_10_POINT_FIELDS
    gpx_11_fields = GPX_11_POINT_FIELDS

    __slots__ = ('latitude', 'longitude', 'elevation', 'time',
                 'magnetic_variation', 'geoid_height', 'name', 'comment',
                 'description', 'source', 'link', 'link_text', 'symbol',
                 'type', 'type_of_gpx_fix', 'satellites',
                 'horizontal_dilution', 'vertical_dilution',
                 'position_dilution', 'age_of_dgps_data', 'dgps_id',
                 'link_type', 'extensions')

    def __init__(self, latitude=None, longitude=None, elevation=None, time=None,
                 name=None, description=None, symbol=None, type=None,
                 comment=None, horizontal_dilution=None, vertical_dilution=None,
                 position_dilution=None):
        mod_geo.Location.__init__(self, latitude, longitude, elevation)

        self.latitude = latitude
        self.longitude = longitude
        self.elevation = elevation
        self.time = time
        self.magnetic_variation = None
        self.geoid_height = None
        self.name = name
        self.comment = comment
        self.description = description
        self.source = None
        self.link = None
        self.link_text = None
        self.link_type = None
        self.symbol = symbol
        self.type = type
        self.type_of_gpx_fix = None
        self.satellites = None
        self.horizontal_dilution = horizontal_dilution
        self.vertical_dilution = vertical_dilution
        self.position_dilution = position_dilution
        self.age_of_dgps_data = None
        self.dgps_id = None
        self.extensions = None

    def __str__(self):
        return '[wpt{%s}:%s,%s@%s]' % (self.name, self.latitude, self.longitude, self.elevation)

    def __repr__(self):
        representation = '%s, %s' % (self.latitude, self.longitude)
        for attribute in 'elevation', 'time', 'name', 'description', 'symbol', 'type', 'comment', \
                'horizontal_dilution', 'vertical_dilution', 'position_dilution':
            value = getattr(self, attribute)
            if value is not None:
                representation += ', %s=%s' % (attribute, repr(value))
        return 'GPXWaypoint(%s)' % representation

    def get_max_dilution_of_precision(self):
        """
        Only care about the max dop for filtering, no need to go into too much detail
        """
        return max(self.horizontal_dilution, self.vertical_dilution, self.position_dilution)

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)


class GPXRoutePoint(mod_geo.Location):
    gpx_10_fields = GPX_10_POINT_FIELDS
    gpx_11_fields = GPX_11_POINT_FIELDS

    __slots__ = ('latitude', 'longitude', 'elevation', 'time',
                 'magnetic_variation', 'geoid_height', 'name', 'comment',
                 'description', 'source', 'link', 'link_text', 'symbol',
                 'type', 'type_of_gpx_fix', 'satellites',
                 'horizontal_dilution', 'vertical_dilution',
                 'position_dilution', 'age_of_dgps_data', 'dgps_id',
                 'link_type', 'extensions')

    def __init__(self, latitude=None, longitude=None, elevation=None, time=None, name=None,
                 description=None, symbol=None, type=None, comment=None,
                 horizontal_dilution=None, vertical_dilution=None,
                 position_dilution=None):

        mod_geo.Location.__init__(self, latitude, longitude, elevation)
        self.latitude = latitude
        self.longitude = longitude
        self.elevation = elevation
        self.time = time
        self.magnetic_variation = None
        self.geoid_height = None
        self.name = name
        self.comment = comment
        self.description = description
        self.source = None
        self.link = None
        self.link_text = None
        self.symbol = symbol
        self.type = type
        self.type_of_gpx_fix = None
        self.satellites = None
        self.horizontal_dilution = horizontal_dilution
        self.vertical_dilution = vertical_dilution
        self.position_dilution = position_dilution
        self.age_of_dgps_data = None
        self.dgps_id = None
        self.link_type = None
        self.extensions = None

    def __str__(self):
        return '[rtept{%s}:%s,%s@%s]' % (self.name, self.latitude, self.longitude, self.elevation)

    def __repr__(self):
        representation = '%s, %s' % (self.latitude, self.longitude)
        for attribute in 'elevation', 'time', 'name', 'description', 'symbol', 'type', 'comment', \
                'horizontal_dilution', 'vertical_dilution', 'position_dilution':
            value = getattr(self, attribute)
            if value is not None:
                representation += ', %s=%s' % (attribute, repr(value))
        return 'GPXRoutePoint(%s)' % representation

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)


class GPXRoute:
    gpx_10_fields = [
            mod_gpxfield.GPXField('name'),
            mod_gpxfield.GPXField('comment', 'cmt'),
            mod_gpxfield.GPXField('description', 'desc'),
            mod_gpxfield.GPXField('source', 'src'),
            mod_gpxfield.GPXField('link', 'url'),
            mod_gpxfield.GPXField('link_text', 'urlname'),
            mod_gpxfield.GPXField('number', type=mod_gpxfield.INT_TYPE),
            mod_gpxfield.GPXComplexField('points', tag='rtept', classs=GPXRoutePoint, is_list=True),
    ]
    gpx_11_fields = [
            mod_gpxfield.GPXField('name'),
            mod_gpxfield.GPXField('comment', 'cmt'),
            mod_gpxfield.GPXField('description', 'desc'),
            mod_gpxfield.GPXField('source', 'src'),
            'link',
                mod_gpxfield.GPXField('link', attribute='href'),
                mod_gpxfield.GPXField('link_text', tag='text'),
                mod_gpxfield.GPXField('link_type', tag='type'),
            '/link',
            mod_gpxfield.GPXField('number', type=mod_gpxfield.INT_TYPE),
            mod_gpxfield.GPXField('type'),
            mod_gpxfield.GPXExtensionsField('extensions'),
            mod_gpxfield.GPXComplexField('points', tag='rtept', classs=GPXRoutePoint, is_list=True),
    ]

    __slots__ = ('name', 'comment', 'description', 'source', 'link',
                 'link_text', 'number', 'points', 'link_type', 'type',
                 'extensions')

    def __init__(self, name=None, description=None, number=None):
        self.name = name
        self.comment = None
        self.description = description
        self.source = None
        self.link = None
        self.link_text = None
        self.number = number
        self.points = []
        self.link_type = None
        self.type = None
        self.extensions = None

    def remove_elevation(self):
        """ Removes elevation data from route """
        for point in self.points:
            point.remove_elevation()

    def length(self):
        """
        Computes length (2-dimensional) of route.

        Returns:
        -----------
        length: float
            Length returned in meters
        """
        return mod_geo.length_2d(self.points)

    def get_center(self):
        """
        Get the center of the route.

        Returns
        -------
        center: Location
            latitude: latitude of center in degrees
            longitude: longitude of center in degrees
            elevation: not calculated here
        """
        if not self.points:
            return None

        if not self.points:
            return None

        sum_lat = 0.
        sum_lon = 0.
        n = 0.

        for point in self.points:
            n += 1.
            sum_lat += point.latitude
            sum_lon += point.longitude

        if not n:
            return mod_geo.Location(float(0), float(0))

        return mod_geo.Location(latitude=sum_lat / n, longitude=sum_lon / n)

    def walk(self, only_points=False):
        """
        Generator for iterating over route points

        Parameters
        ----------
        only_points: boolean
            Only yield points (no index yielded)

        Yields
        ------
        point: GPXRoutePoint
            A point in the GPXRoute
        point_no: int
            Not included in yield if only_points is true
        """
        for point_no, point in enumerate(self.points):
            if only_points:
                yield point
            else:
                yield point, point_no

    def get_points_no(self):
        """
        Get the number of points in route.

        Returns
        ----------
        num_points : integer
            Number of points in route
        """
        return len(self.points)

    def move(self, location_delta):
        """
        Moves each point in the route.

        Parameters
        ----------
        location_delta: LocationDelta
            LocationDelta to move each point
        """
        for route_point in self.points:
            route_point.move(location_delta)

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)

    def __repr__(self):
        representation = ''
        for attribute in 'name', 'description', 'number':
            value = getattr(self, attribute)
            if value is not None:
                representation += '%s%s=%s' % (', ' if representation else '', attribute, repr(value))
        representation += '%spoints=[%s])' % (', ' if representation else '', '...' if self.points else '')
        return 'GPXRoute(%s)' % representation


class GPXTrackPoint(mod_geo.Location):
    gpx_10_fields = GPX_TRACK_POINT_FIELDS
    gpx_11_fields = GPX_11_POINT_FIELDS

    __slots__ = ('latitude', 'longitude', 'elevation', 'time', 'course',
                 'speed', 'magnetic_variation', 'geoid_height', 'name',
                 'comment', 'description', 'source', 'link', 'link_text',
                 'symbol', 'type', 'type_of_gpx_fix', 'satellites',
                 'horizontal_dilution', 'vertical_dilution',
                 'position_dilution', 'age_of_dgps_data', 'dgps_id',
                 'link_type', 'extensions')

    def __init__(self, latitude=None, longitude=None, elevation=None, time=None, symbol=None, comment=None,
                 horizontal_dilution=None, vertical_dilution=None, position_dilution=None, speed=None,
                 name=None):
        mod_geo.Location.__init__(self, latitude, longitude, elevation)
        self.latitude = latitude
        self.longitude = longitude
        self.elevation = elevation
        self.time = time
        self.course = None
        self.speed = speed
        self.magnetic_variation = None
        self.geoid_height = None
        self.name = name
        self.comment = comment
        self.description = None
        self.source = None
        self.link = None
        self.link_text = None
        self.link_type = None
        self.symbol = symbol
        self.type = None
        self.type_of_gpx_fix = None
        self.satellites = None
        self.horizontal_dilution = horizontal_dilution
        self.vertical_dilution = vertical_dilution
        self.position_dilution = position_dilution
        self.age_of_dgps_data = None
        self.dgps_id = None
        self.extensions = None

    def __repr__(self):
        representation = '%s, %s' % (self.latitude, self.longitude)
        for attribute in 'elevation', 'time', 'symbol', 'comment', 'horizontal_dilution', \
                'vertical_dilution', 'position_dilution', 'speed', 'name':
            value = getattr(self, attribute)
            if value is not None:
                representation += ', %s=%s' % (attribute, repr(value))
        return 'GPXTrackPoint(%s)' % representation

    def adjust_time(self, delta):
        """
        Adjusts the time of the point by the specified delta

        Parameters
        ----------
        delta : datetime.timedelta
            Positive time delta will adjust time into the future
            Negative time delta will adjust time into the past
        """
        if self.time:
            self.time += delta

    def remove_time(self):
        """ Will remove time metadata. """
        self.time = None

    def time_difference(self, track_point):
        """
        Get time difference between specified point and this point.

        Parameters
        ----------
        track_point : GPXTrackPoint

        Returns
        ----------
        time_difference : float
            Time difference returned in seconds
        """
        if not self.time or not track_point or not track_point.time:
            return None

        time_1 = self.time
        time_2 = track_point.time

        if time_1 == time_2:
            return 0

        if time_1 > time_2:
            delta = time_1 - time_2
        else:
            delta = time_2 - time_1

        return mod_utils.total_seconds(delta)

    def speed_between(self, track_point):
        """
        Compute the speed between specified point and this point.

        NOTE: This is a computed speed, not the GPXTrackPoint speed that comes
              the GPX file.

        Parameters
        ----------
        track_point : GPXTrackPoint

        Returns
        ----------
        speed : float
            Speed returned in meters/second
        """
        if not track_point:
            return None

        seconds = self.time_difference(track_point)
        length = self.distance_3d(track_point)
        if not length:
            length = self.distance_2d(track_point)

        if not seconds or length is None:
            return None

        return length / float(seconds)

    def __str__(self):
        return '[trkpt:%s,%s@%s@%s]' % (self.latitude, self.longitude, self.elevation, self.time)

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)


class GPXTrackSegment:
    gpx_10_fields = [
            mod_gpxfield.GPXComplexField('points', tag='trkpt', classs=GPXTrackPoint, is_list=True),
    ]
    gpx_11_fields = [
            mod_gpxfield.GPXComplexField('points', tag='trkpt', classs=GPXTrackPoint, is_list=True),
            mod_gpxfield.GPXExtensionsField('extensions'),
    ]

    __slots__ = ('points', 'extensions', )

    def __init__(self, points=None):
        self.points = points if points else []
        self.extensions = None

    def simplify(self, max_distance=None):
        """
        Simplify using the Ramer-Douglas-Peucker algorithm: http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
        """
        if not max_distance:
            max_distance = 10

        self.points = mod_geo.simplify_polyline(self.points, max_distance)

    def reduce_points(self, min_distance):
        """
        Reduces the number of points in the track segment. Segment points will
        be updated in place.

        Parameters
        ----------
        min_distance : float
            The minimum separation in meters between points
        """
        reduced_points = []
        for point in self.points:
            if reduced_points:
                distance = reduced_points[-1].distance_3d(point)
                if distance >= min_distance:
                    reduced_points.append(point)
            else:
                # Leave first point:
                reduced_points.append(point)

        self.points = reduced_points

    def _find_next_simplified_point(self, pos, max_distance):
        for candidate in range(pos + 1, len(self.points) - 1):
            for i in range(pos + 1, candidate):
                d = mod_geo.distance_from_line(self.points[i],
                                               self.points[pos],
                                               self.points[candidate])
                if d > max_distance:
                    return candidate - 1
        return None

    def adjust_time(self, delta):
        """
        Adjusts the time of all points in the segment by the specified delta

        Parameters
        ----------
        delta : datetime.timedelta
            Positive time delta will adjust point times into the future
            Negative time delta will adjust point times into the past
        """
        for track_point in self.points:
            track_point.adjust_time(delta)

    def remove_time(self):
        """ Removes time data for all points in the segment. """
        for track_point in self.points:
            track_point.remove_time()

    def remove_elevation(self):
        """ Removes elevation data for all points in the segment. """
        for track_point in self.points:
            track_point.remove_elevation()

    def length_2d(self):
        """
        Computes 2-dimensional length (meters) of segment (only latitude and
        longitude, no elevation).

        Returns
        ----------
        length : float
            Length returned in meters
        """
        return mod_geo.length_2d(self.points)

    def length_3d(self):
        """
        Computes 3-dimensional length of segment (latitude, longitude, and
        elevation).

        Returns
        ----------
        length : float
            Length returned in meters
        """
        return mod_geo.length_3d(self.points)

    def move(self, location_delta):
        """
        Moves each point in the segment.

        Parameters
        ----------
        location_delta: LocationDelta object
            Delta (distance/angle or lat/lon offset to apply each point in the
            segment
        """
        for track_point in self.points:
            track_point.move(location_delta)

    def walk(self, only_points=False):
        """
        Generator for iterating over segment points

        Parameters
        ----------
        only_points: boolean
            Only yield points (no index yielded)

        Yields
        ------
        point: GPXTrackPoint
            A point in the sement
        point_no: int
            Not included in yield if only_points is true
        """
        for point_no, point in enumerate(self.points):
            if only_points:
                yield point
            else:
                yield point, point_no

    def get_points_no(self):
        """
        Gets the number of points in segment.

        Returns
        ----------
        num_points : integer
            Number of points in segment
        """
        if not self.points:
            return 0
        return len(self.points)

    def split(self, point_no):
        """
        Splits the segment into two parts. If one of the split segments is
        empty it will not be added in the result. The segments will be split
        in place.

        Parameters
        ----------
        point_no : integer
            The index of the track point in the segment to split
        """
        part_1 = self.points[:point_no + 1]
        part_2 = self.points[point_no + 1:]
        return GPXTrackSegment(part_1), GPXTrackSegment(part_2)

    def join(self, track_segment):
        """ Joins with another segment """
        self.points += track_segment.points

    def remove_point(self, point_no):
        """ Removes a point specificed by index from the segment """
        if point_no < 0 or point_no >= len(self.points):
            return

        part_1 = self.points[:point_no]
        part_2 = self.points[point_no + 1:]

        self.points = part_1 + part_2

    def get_moving_data(self, stopped_speed_threshold=None):
        """
        Return a tuple of (moving_time, stopped_time, moving_distance,
        stopped_distance, max_speed) that may be used for detecting the time
        stopped, and max speed. Not that those values are not absolutely true,
        because the "stopped" or "moving" information aren't saved in the segment.

        Because of errors in the GPS recording, it may be good to calculate
        them on a reduced and smoothed version of the track.

        Parameters
        ----------
        stopped_speed_threshold : float
            speeds (km/h) below this threshold are treated as if having no
            movement. Default is 1 km/h.

        Returns
        ----------
        moving_data : MovingData : named tuple
            moving_time : float
                time (seconds) of segment in which movement was occuring
            stopped_time : float
                time (seconds) of segment in which no movement was occuring
            stopped_distance : float
                distance (meters) travelled during stopped times
            moving_distance : float
                distance (meters) travelled during moving times
            max_speed : float
                Maximum speed (m/s) during the segment.
        """
        if not stopped_speed_threshold:
            stopped_speed_threshold = DEFAULT_STOPPED_SPEED_THRESHOLD

        moving_time = 0.
        stopped_time = 0.

        moving_distance = 0.
        stopped_distance = 0.

        speeds_and_distances = []

        for i in range(1, len(self.points)):

            previous = self.points[i - 1]
            point = self.points[i]

            # Won't compute max_speed for first and last because of common GPS
            # recording errors, and because smoothing don't work well for those
            # points:
            if point.time and previous.time:
                timedelta = point.time - previous.time

                if point.elevation and previous.elevation:
                    distance = point.distance_3d(previous)
                else:
                    distance = point.distance_2d(previous)

                seconds = mod_utils.total_seconds(timedelta)
                speed_kmh = 0
                if seconds > 0:
                    # TODO: compute treshold in m/s instead this to kmh every time:
                    speed_kmh = (distance / 1000.) / (mod_utils.total_seconds(timedelta) / 60. ** 2)

                #print speed, stopped_speed_threshold
                if speed_kmh <= stopped_speed_threshold:
                    stopped_time += mod_utils.total_seconds(timedelta)
                    stopped_distance += distance
                else:
                    moving_time += mod_utils.total_seconds(timedelta)
                    moving_distance += distance

                    if distance and moving_time:
                        speeds_and_distances.append((distance / mod_utils.total_seconds(timedelta), distance, ))

        max_speed = None
        if speeds_and_distances:
            max_speed = mod_geo.calculate_max_speed(speeds_and_distances)

        return MovingData(moving_time, stopped_time, moving_distance, stopped_distance, max_speed)

    def get_time_bounds(self):
        """
        Gets the time bound (start and end) of the segment.

        returns
        ----------
        time_bounds : TimeBounds named tuple
            start_time : datetime
                Start time of the first segment in track
            end time : datetime
                End time of the last segment in track
        """
        start_time = None
        end_time = None

        for point in self.points:
            if point.time:
                if not start_time:
                    start_time = point.time
                if point.time:
                    end_time = point.time

        return TimeBounds(start_time, end_time)

    def get_bounds(self):
        """
        Gets the latitude and longitude bounds of the segment.

        Returns
        ----------
        bounds : Bounds named tuple
            min_latitude : float
                Minimum latitude of segment in decimal degrees [-90, 90]
            max_latitude : float
                Maxium latitude of segment in decimal degrees [-90, 90]
            min_longitude : float
                Minium longitude of segment in decimal degrees [-180, 180]
            max_longitude : float
                Maxium longitude of segment in decimal degrees [-180, 180]
        """
        min_lat = None
        max_lat = None
        min_lon = None
        max_lon = None

        for point in self.points:
            if min_lat is None or point.latitude < min_lat:
                min_lat = point.latitude
            if max_lat is None or point.latitude > max_lat:
                max_lat = point.latitude
            if min_lon is None or point.longitude < min_lon:
                min_lon = point.longitude
            if max_lon is None or point.longitude > max_lon:
                max_lon = point.longitude

        return GPXBounds(min_lat, max_lat, min_lon, max_lon)

    def get_speed(self, point_no):
        """
        Computes the speed at the specified point index.

        Parameters
        ----------
        point_no : integer
            index of the point used to compute speed

        Returns
        ----------
        speed : float
            Speed returned in m/s
        """
        point = self.points[point_no]

        previous_point = None
        next_point = None

        if 0 < point_no < len(self.points):
            previous_point = self.points[point_no - 1]
        if 0 < point_no < len(self.points) - 1:
            next_point = self.points[point_no + 1]

        #mod_logging.debug('previous: %s' % previous_point)
        #mod_logging.debug('next: %s' % next_point)

        speed_1 = point.speed_between(previous_point)
        speed_2 = point.speed_between(next_point)

        if speed_1:
            speed_1 = abs(speed_1)
        if speed_2:
            speed_2 = abs(speed_2)

        if speed_1 and speed_2:
            return (speed_1 + speed_2) / 2.

        if speed_1:
            return speed_1

        return speed_2

    def add_elevation(self, delta):
        """
        Adjusts elevation data for segment.

        Parameters
        ----------
        delta : float
            Elevation delta in meters to apply to track
        """
        mod_logging.debug('delta = %s' % delta)

        if not delta:
            return

        for track_point in self.points:
            if track_point.elevation is not None:
                track_point.elevation += delta

    def add_missing_data(self, get_data_function, add_missing_function):
        """
        Calculate missing data.

        Parameters
        ----------
        get_data_function : object
            Returns the data from point
        add_missing_function : void
            Function with the following arguments: array with points with missing data, the point before them (with data),
            the point after them (with data), and distance ratios between points in the interval (the sum of distances ratios
            will be 1)
        """
        if not get_data_function:
            raise GPXException('Invalid get_data_function: %s' % get_data_function)
        if not add_missing_function:
            raise GPXException('Invalid add_missing_function: %s' % add_missing_function)

        # Points (*without* data) between two points (*with* data):
        interval = []
        # Point (*with* data) before and after the interval:
        start_point = None

        previous_point = None
        for track_point in self.points:
            data = get_data_function(track_point)
            if data is None and previous_point:
                if not start_point:
                    start_point = previous_point
                interval.append(track_point)
            else:
                if interval:
                    distances_ratios = self._get_interval_distances_ratios(interval,
                                                                           start_point, track_point)
                    add_missing_function(interval, start_point, track_point,
                                         distances_ratios)
                    start_point = None
                    interval = []
            previous_point = track_point

    def _get_interval_distances_ratios(self, interval, start, end):
        assert start, start
        assert end, end
        assert interval, interval
        assert len(interval) > 0, interval

        distances = []
        distance_from_start = 0
        previous_point = start
        for point in interval:
            distance_from_start += float(point.distance_3d(previous_point))
            distances.append(distance_from_start)
            previous_point = point

        from_start_to_end = distances[-1] + interval[-1].distance_3d(end)

        assert len(interval) == len(distances)

        return list(map(
                lambda distance: (distance / from_start_to_end) if from_start_to_end else 0,
                distances))

    def get_duration(self):
        """
        Calculates duration or track segment

        Returns
        -------
        duration: float
            Duration in seconds
        """
        if not self.points or len(self.points) < 2:
            return 0

        # Search for start:
        first = self.points[0]
        if not first.time:
            first = self.points[1]

        last = self.points[-1]
        if not last.time:
            last = self.points[-2]

        if not last.time or not first.time:
            mod_logging.debug('Can\'t find time')
            return None

        if last.time < first.time:
            mod_logging.debug('Not enough time data')
            return None

        return mod_utils.total_seconds(last.time - first.time)

    def get_uphill_downhill(self):
        """
        Calculates the uphill and downhill elevation climbs for the track
        segment. If elevation for some points is not found those are simply
        ignored.

        Returns
        -------
        uphill_downhill: UphillDownhill named tuple
            uphill: float
                Uphill elevation climbs in meters
            downhill: float
                Downhill elevation descent in meters
        """
        if not self.points:
            return UphillDownhill(0, 0)

        elevations = list(map(lambda point: point.elevation, self.points))
        uphill, downhill = mod_geo.calculate_uphill_downhill(elevations)

        return UphillDownhill(uphill, downhill)

    def get_elevation_extremes(self):
        """
        Calculate elevation extremes of track segment

        Returns
        -------
        min_max_elevation: MinimumMaximum named tuple
            minimum: float
                Minimum elevation in meters
            maximum: float
                Maximum elevation in meters
        """
        if not self.points:
            return MinimumMaximum(None, None)

        elevations = map(lambda location: location.elevation, self.points)
        elevations = filter(lambda elevation: elevation is not None, elevations)
        elevations = list(elevations)

        if len(elevations) == 0:
            return MinimumMaximum(None, None)

        return MinimumMaximum(min(elevations), max(elevations))

    def get_location_at(self, time):
        """
        Gets approx. location at given time. Note that, at the moment this
        method returns an instance of GPXTrackPoint in the future -- this may
        be a mod_geo.Location instance with approximated latitude, longitude
        and elevation!
        """
        if not self.points:
            return None

        if not time:
            return None

        first_time = self.points[0].time
        last_time = self.points[-1].time

        if not first_time and not last_time:
            mod_logging.debug('No times for track segment')
            return None

        if not first_time <= time <= last_time:
            mod_logging.debug('Not in track (search for:%s, start:%s, end:%s)' % (time, first_time, last_time))
            return None

        for point in self.points:
            if point.time and time <= point.time:
                # TODO: If between two points -- approx position!
                # return mod_geo.Location(point.latitude, point.longitude)
                return point

    def get_nearest_location(self, location):
        """ Return the (location, track_point_no) on this track segment """
        if not self.points:
            return None, None

        result = None
        current_distance = None
        result_track_point_no = None
        for i in range(len(self.points)):
            track_point = self.points[i]
            if not result:
                result = track_point
            else:
                distance = track_point.distance_2d(location)
                #print current_distance, distance
                if not current_distance or distance < current_distance:
                    current_distance = distance
                    result = track_point
                    result_track_point_no = i

        return result, result_track_point_no

    def smooth(self, vertical=True, horizontal=False, remove_extremes=False):
        """ "Smooths" the elevation graph. Can be called multiple times. """
        if len(self.points) <= 3:
            return

        elevations = []
        latitudes = []
        longitudes = []

        for point in self.points:
            elevations.append(point.elevation)
            latitudes.append(point.latitude)
            longitudes.append(point.longitude)

        avg_distance = 0
        avg_elevation_delta = 1
        if remove_extremes:
            # compute the average distance between two points:
            distances = []
            elevations_delta = []
            for i in range(len(self.points))[1:]:
                distances.append(self.points[i].distance_2d(self.points[i - 1]))
                elevation_1 = self.points[i].elevation
                elevation_2 = self.points[i - 1].elevation
                if elevation_1 is not None and elevation_2 is not None:
                    elevations_delta.append(abs(elevation_1 - elevation_2))
            if distances:
                avg_distance = 1.0 * sum(distances) / len(distances)
            if elevations_delta:
                avg_elevation_delta = 1.0 * sum(elevations_delta) / len(elevations_delta)

        # If The point moved more than this number * the average distance between two
        # points -- then is a candidate for deletion:
        # TODO: Make this a method parameter
        remove_2d_extremes_threshold = 1.75 * avg_distance
        remove_elevation_extremes_threshold = avg_elevation_delta * 5  # TODO: Param

        new_track_points = [self.points[0]]

        for i in range(len(self.points))[1:-1]:
            new_point = None
            point_removed = False
            if vertical and elevations[i - 1] and elevations[i] and elevations[i + 1]:
                old_elevation = self.points[i].elevation
                new_elevation = SMOOTHING_RATIO[0] * elevations[i - 1] + \
                    SMOOTHING_RATIO[1] * elevations[i] + \
                    SMOOTHING_RATIO[2] * elevations[i + 1]

                if not remove_extremes:
                    self.points[i].elevation = new_elevation

                if remove_extremes:
                    # The point must be enough distant to *both* neighbours:
                    d1 = abs(old_elevation - elevations[i - 1])
                    d2 = abs(old_elevation - elevations[i + 1])
                    #print d1, d2, remove_2d_extremes_threshold

                    # TODO: Remove extremes threshold is meant only for 2D, elevation must be
                    # computed in different way!
                    if min(d1, d2) < remove_elevation_extremes_threshold and abs(old_elevation - new_elevation) < remove_2d_extremes_threshold:
                        new_point = self.points[i]
                    else:
                        #print 'removed elevation'
                        point_removed = True
                else:
                    new_point = self.points[i]
            else:
                new_point = self.points[i]

            if horizontal:
                old_latitude = self.points[i].latitude
                new_latitude = SMOOTHING_RATIO[0] * latitudes[i - 1] + \
                    SMOOTHING_RATIO[1] * latitudes[i] + \
                    SMOOTHING_RATIO[2] * latitudes[i + 1]
                old_longitude = self.points[i].longitude
                new_longitude = SMOOTHING_RATIO[0] * longitudes[i - 1] + \
                    SMOOTHING_RATIO[1] * longitudes[i] + \
                    SMOOTHING_RATIO[2] * longitudes[i + 1]

                if not remove_extremes:
                    self.points[i].latitude = new_latitude
                    self.points[i].longitude = new_longitude

                # TODO: This is not ideal.. Because if there are points A, B and C on the same
                # line but B is very close to C... This would remove B (and possibly) A even though
                # it is not an extreme. This is the reason for this algorithm:
                d1 = mod_geo.distance(latitudes[i - 1], longitudes[i - 1], None, latitudes[i], longitudes[i], None)
                d2 = mod_geo.distance(latitudes[i + 1], longitudes[i + 1], None, latitudes[i], longitudes[i], None)
                d = mod_geo.distance(latitudes[i - 1], longitudes[i - 1], None, latitudes[i + 1], longitudes[i + 1], None)

                #print d1, d2, d, remove_extremes

                if d1 + d2 > d * 1.5 and remove_extremes:
                    d = mod_geo.distance(old_latitude, old_longitude, None, new_latitude, new_longitude, None)
                    #print "d, threshold = ", d, remove_2d_extremes_threshold
                    if d < remove_2d_extremes_threshold:
                        new_point = self.points[i]
                    else:
                        #print 'removed 2d'
                        point_removed = True
                else:
                    new_point = self.points[i]

            if new_point and not point_removed:
                new_track_points.append(new_point)

        new_track_points.append(self.points[- 1])

        #print 'len=', len(new_track_points)

        self.points = new_track_points

    def has_times(self):
        """
        Returns if points in this segment contains timestamps.

        The first point, the last point, and 75% of the points must have times
        for this method to return true.
        """
        if not self.points:
            return True
            # ... or otherwise one empty track segment would change the entire
            # track's "has_times" status!

        found = 0
        for track_point in self.points:
            if track_point.time:
                found += 1

        return len(self.points) > 2 and float(found) / float(len(self.points)) > .75

    def has_elevations(self):
        """
        Returns if points in this segment contains elevation.

        The first point, the last point, and at least 75% of the points must
        have elevation for this method to return true.
        """
        if not self.points:
            return True
            # ... or otherwise one empty track segment would change the entire
            # track's "has_times" status!

        found = 0
        for track_point in self.points:
            if track_point.elevation:
                found += 1

        return len(self.points) > 2 and float(found) / float(len(self.points)) > .75

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)

    def __repr__(self):
        return 'GPXTrackSegment(points=[%s])' % ('...' if self.points else '')

    def clone(self):
        return mod_copy.deepcopy(self)


class GPXTrack:
    gpx_10_fields = [
            mod_gpxfield.GPXField('name'),
            mod_gpxfield.GPXField('comment', 'cmt'),
            mod_gpxfield.GPXField('description', 'desc'),
            mod_gpxfield.GPXField('source', 'src'),
            mod_gpxfield.GPXField('link', 'url'),
            mod_gpxfield.GPXField('link_text', 'urlname'),
            mod_gpxfield.GPXField('number', type=mod_gpxfield.INT_TYPE),
            mod_gpxfield.GPXComplexField('segments', tag='trkseg', classs=GPXTrackSegment, is_list=True),
    ]
    gpx_11_fields = [
            mod_gpxfield.GPXField('name'),
            mod_gpxfield.GPXField('comment', 'cmt'),
            mod_gpxfield.GPXField('description', 'desc'),
            mod_gpxfield.GPXField('source', 'src'),
            'link',
                mod_gpxfield.GPXField('link', attribute='href'),
                mod_gpxfield.GPXField('link_text', tag='text'),
                mod_gpxfield.GPXField('link_type', tag='type'),
            '/link',
            mod_gpxfield.GPXField('number', type=mod_gpxfield.INT_TYPE),
            mod_gpxfield.GPXField('type'),
            mod_gpxfield.GPXExtensionsField('extensions'),
            mod_gpxfield.GPXComplexField('segments', tag='trkseg', classs=GPXTrackSegment, is_list=True),
    ]

    __slots__ = ('name', 'comment', 'description', 'source', 'link',
                 'link_text', 'number', 'segments', 'link_type', 'type',
                 'extensions')

    def __init__(self, name=None, description=None, number=None):
        self.name = name
        self.comment = None
        self.description = description
        self.source = None
        self.link = None
        self.link_text = None
        self.number = number
        self.segments = []
        self.link_type = None
        self.type = None
        self.extensions = None

    def simplify(self, max_distance=None):
        """
        Simplify using the Ramer-Douglas-Peucker algorithm: http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
        """
        for segment in self.segments:
            segment.simplify(max_distance=max_distance)

    def reduce_points(self, min_distance):
        """
        Reduces the number of points in the track. Segment points will be
        updated in place.

        Parameters
        ----------
        min_distance : float
            The minimum separation in meters between points
        """
        for segment in self.segments:
            segment.reduce_points(min_distance)

    def adjust_time(self, delta):
        """
        Adjusts the time of all segments in the track by the specified delta

        Parameters
        ----------
        delta : datetime.timedelta
            Positive time delta will adjust time into the future
            Negative time delta will adjust time into the past
        """
        for segment in self.segments:
            segment.adjust_time(delta)

    def remove_time(self):
        """ Removes time data for all points in all segments of track. """
        for segment in self.segments:
            segment.remove_time()

    def remove_elevation(self):
        """ Removes elevation data for all points in all segments of track. """
        for segment in self.segments:
            segment.remove_elevation()

    def remove_empty(self):
        """ Removes empty segments in track """
        result = []

        for segment in self.segments:
            if len(segment.points) > 0:
                result.append(segment)

        self.segments = result

    def length_2d(self):
        """
        Computes 2-dimensional length (meters) of track (only latitude and
        longitude, no elevation). This is the sum of the 2D length of all
        segments.

        Returns
        ----------
        length : float
            Length returned in meters
        """
        length = 0
        for track_segment in self.segments:
            d = track_segment.length_2d()
            if d:
                length += d
        return length

    def get_time_bounds(self):
        """
        Gets the time bound (start and end) of the track.

        Returns
        ----------
        time_bounds : TimeBounds named tuple
            start_time : datetime
                Start time of the first segment in track
            end time : datetime
                End time of the last segment in track
        """
        start_time = None
        end_time = None

        for track_segment in self.segments:
            point_start_time, point_end_time = track_segment.get_time_bounds()
            if not start_time and point_start_time:
                start_time = point_start_time
            if point_end_time:
                end_time = point_end_time

        return TimeBounds(start_time, end_time)

    def get_bounds(self):
        """
        Gets the latitude and longitude bounds of the track.

        Returns
        ----------
        bounds : Bounds named tuple
            min_latitude : float
                Minimum latitude of track in decimal degrees [-90, 90]
            max_latitude : float
                Maxium latitude of track in decimal degrees [-90, 90]
            min_longitude : float
                Minium longitude of track in decimal degrees [-180, 180]
            max_longitude : float
                Maxium longitude of track in decimal degrees [-180, 180]
        """
        min_lat = None
        max_lat = None
        min_lon = None
        max_lon = None
        for track_segment in self.segments:
            bounds = track_segment.get_bounds()

            if not mod_utils.is_numeric(min_lat) or (bounds.min_latitude and bounds.min_latitude < min_lat):
                min_lat = bounds.min_latitude
            if not mod_utils.is_numeric(max_lat) or (bounds.max_latitude and bounds.max_latitude > max_lat):
                max_lat = bounds.max_latitude
            if not mod_utils.is_numeric(min_lon) or (bounds.min_longitude and bounds.min_longitude < min_lon):
                min_lon = bounds.min_longitude
            if not mod_utils.is_numeric(max_lon) or (bounds.max_longitude and bounds.max_longitude > max_lon):
                max_lon = bounds.max_longitude

        return GPXBounds(min_lat, max_lat, min_lon, max_lon)

    def walk(self, only_points=False):
        """
        Generator used to iterates through track

        Parameters
        ----------
        only_point s: boolean
            Only yield points while walking

        Yields
        ----------
        point : GPXTrackPoint
            Point in the track
        segment_no : integer
            Index of segment containint point. This is suppressed if only_points
            is True.
        point_no : integer
            Index of point. This is suppressed if only_points is True.
        """
        for segment_no, segment in enumerate(self.segments):
            for point_no, point in enumerate(segment.points):
                if only_points:
                    yield point
                else:
                    yield point, segment_no, point_no

    def get_points_no(self):
        """
        Get the number of points in all segments in the track.

        Returns
        ----------
        num_points : integer
            Number of points in track
        """
        result = 0

        for track_segment in self.segments:
            result += track_segment.get_points_no()

        return result

    def length_3d(self):
        """
        Computes 3-dimensional length of track (latitude, longitude, and
        elevation). This is the sum of the 3D length of all segments.

        Returns
        ----------
        length : float
            Length returned in meters
        """
        length = 0
        for track_segment in self.segments:
            d = track_segment.length_3d()
            if d:
                length += d
        return length

    def split(self, track_segment_no, track_point_no):
        """
        Splits one of the segments in the track in two parts. If one of the
        split segments is empty it will not be added in the result. The
        segments will be split in place.

        Parameters
        ----------
        track_segment_no : integer
            The index of the segment to split
        track_point_no : integer
            The index of the track point in the segment to split
        """
        new_segments = []
        for i in range(len(self.segments)):
            segment = self.segments[i]
            if i == track_segment_no:
                segment_1, segment_2 = segment.split(track_point_no)
                if segment_1:
                    new_segments.append(segment_1)
                if segment_2:
                    new_segments.append(segment_2)
            else:
                new_segments.append(segment)
        self.segments = new_segments

    def join(self, track_segment_no, track_segment_no_2=None):
        """
        Joins two segments of this track. The segments will be split in place.

        Parameters
        ----------
        track_segment_no : integer
            The index of the first segment to join
        track_segment_no_2 : integer
            The index of second segment to join. If track_segment_no_2 is not
            provided,the join will be with the next segment after
            track_segment_no.
        """
        if not track_segment_no_2:
            track_segment_no_2 = track_segment_no + 1

        if track_segment_no_2 >= len(self.segments):
            return

        new_segments = []
        for i in range(len(self.segments)):
            segment = self.segments[i]
            if i == track_segment_no:
                second_segment = self.segments[track_segment_no_2]
                segment.join(second_segment)

                new_segments.append(segment)
            elif i == track_segment_no_2:
                # Nothing, it is already joined
                pass
            else:
                new_segments.append(segment)
        self.segments = new_segments

    def get_moving_data(self, stopped_speed_threshold=None):
        """
        Return a tuple of (moving_time, stopped_time, moving_distance,
        stopped_distance, max_speed) that may be used for detecting the time
        stopped, and max speed. Not that those values are not absolutely true,
        because the "stopped" or "moving" information aren't saved in the track.

        Because of errors in the GPS recording, it may be good to calculate
        them on a reduced and smoothed version of the track.

        Parameters
        ----------
        stopped_speed_threshold : float
            speeds (km/h) below this threshold are treated as if having no
            movement. Default is 1 km/h.

        Returns
        ----------
        moving_data : MovingData : named tuple
            moving_time : float
                time (seconds) of track in which movement was occuring
            stopped_time : float
                time (seconds) of track in which no movement was occuring
            stopped_distance : float
                distance (meters) travelled during stopped times
            moving_distance : float
                distance (meters) travelled during moving times
            max_speed : float
                Maximum speed (m/s) during the track.
        """
        moving_time = 0.
        stopped_time = 0.

        moving_distance = 0.
        stopped_distance = 0.

        max_speed = 0.

        for segment in self.segments:
            track_moving_time, track_stopped_time, track_moving_distance, track_stopped_distance, track_max_speed = segment.get_moving_data(stopped_speed_threshold)
            moving_time += track_moving_time
            stopped_time += track_stopped_time
            moving_distance += track_moving_distance
            stopped_distance += track_stopped_distance

            if track_max_speed is not None and track_max_speed > max_speed:
                max_speed = track_max_speed

        return MovingData(moving_time, stopped_time, moving_distance, stopped_distance, max_speed)

    def add_elevation(self, delta):
        """
        Adjusts elevation data for track.

        Parameters
        ----------
        delta : float
            Elevation delta in meters to apply to track
        """
        for track_segment in self.segments:
            track_segment.add_elevation(delta)

    def add_missing_data(self, get_data_function, add_missing_function):
        for track_segment in self.segments:
            track_segment.add_missing_data(get_data_function, add_missing_function)

    def move(self, location_delta):
        """
        Moves each point in the track.

        Parameters
        ----------
        location_delta: LocationDelta object
            Delta (distance/angle or lat/lon offset to apply each point in each
            segment of the track
        """
        for track_segment in self.segments:
            track_segment.move(location_delta)

    def get_duration(self):
        """
        Calculates duration or track

        Returns
        -------
        duration: float
            Duration in seconds or None if any time data is missing
        """
        if not self.segments:
            return 0

        result = 0
        for track_segment in self.segments:
            duration = track_segment.get_duration()
            if duration or duration == 0:
                result += duration
            elif duration is None:
                return None

        return result

    def get_uphill_downhill(self):
        """
        Calculates the uphill and downhill elevation climbs for the track.
        If elevation for some points is not found those are simply ignored.

        Returns
        -------
        uphill_downhill: UphillDownhill named tuple
            uphill: float
                Uphill elevation climbs in meters
            downhill: float
                Downhill elevation descent in meters
        """
        if not self.segments:
            return UphillDownhill(0, 0)

        uphill = 0
        downhill = 0

        for track_segment in self.segments:
            current_uphill, current_downhill = track_segment.get_uphill_downhill()

            uphill += current_uphill
            downhill += current_downhill

        return UphillDownhill(uphill, downhill)

    def get_location_at(self, time):
        """
        Gets approx. location at given time. Note that, at the moment this
        method returns an instance of GPXTrackPoint in the future -- this may
        be a mod_geo.Location instance with approximated latitude, longitude
        and elevation!
        """
        result = []
        for track_segment in self.segments:
            location = track_segment.get_location_at(time)
            if location:
                result.append(location)

        return result

    def get_elevation_extremes(self):
        """
        Calculate elevation extremes of track

        Returns
        -------
        min_max_elevation: MinimumMaximum named tuple
            minimum: float
                Minimum elevation in meters
            maximum: float
                Maximum elevation in meters
        """
        if not self.segments:
            return MinimumMaximum(None, None)

        elevations = []

        for track_segment in self.segments:
            (_min, _max) = track_segment.get_elevation_extremes()
            if _min is not None:
                elevations.append(_min)
            if _max is not None:
                elevations.append(_max)

        if len(elevations) == 0:
            return MinimumMaximum(None, None)

        return MinimumMaximum(min(elevations), max(elevations))

    def get_center(self):
        """
        Get the center of the route.

        Returns
        -------
        center: Location
            latitude: latitude of center in degrees
            longitude: longitude of center in degrees
            elevation: not calculated here
        """
        if not self.segments:
            return None
        sum_lat = 0
        sum_lon = 0
        n = 0
        for track_segment in self.segments:
            for point in track_segment.points:
                n += 1.
                sum_lat += point.latitude
                sum_lon += point.longitude

        if not n:
            return mod_geo.Location(float(0), float(0))

        return mod_geo.Location(latitude=sum_lat / n, longitude=sum_lon / n)

    def smooth(self, vertical=True, horizontal=False, remove_extremes=False):
        """ See: GPXTrackSegment.smooth() """
        for track_segment in self.segments:
            track_segment.smooth(vertical, horizontal, remove_extremes)

    def has_times(self):
        """ See GPXTrackSegment.has_times() """
        if not self.segments:
            return None

        result = True
        for track_segment in self.segments:
            result = result and track_segment.has_times()

        return result

    def has_elevations(self):
        """ Returns true if track data has elevation for all segments """
        if not self.segments:
            return None

        result = True
        for track_segment in self.segments:
            result = result and track_segment.has_elevations()

        return result

    def get_nearest_location(self, location):
        """ Returns (location, track_segment_no, track_point_no) for nearest location on track """
        if not self.segments:
            return None

        result = None
        distance = None
        result_track_segment_no = None
        result_track_point_no = None

        for i in range(len(self.segments)):
            track_segment = self.segments[i]
            nearest_location, track_point_no = track_segment.get_nearest_location(location)
            nearest_location_distance = None
            if nearest_location:
                nearest_location_distance = nearest_location.distance_2d(location)

            if not distance or nearest_location_distance < distance:
                if nearest_location:
                    distance = nearest_location_distance
                    result = nearest_location
                    result_track_segment_no = i
                    result_track_point_no = track_point_no

        return result, result_track_segment_no, result_track_point_no

    def clone(self):
        return mod_copy.deepcopy(self)

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)

    def __repr__(self):
        representation = ''
        for attribute in 'name', 'description', 'number':
            value = getattr(self, attribute)
            if value is not None:
                representation += '%s%s=%s' % (', ' if representation else '', attribute, repr(value))
        representation += '%ssegments=%s' % (', ' if representation else '', repr(self.segments))
        return 'GPXTrack(%s)' % representation


class GPX:
    gpx_10_fields = [
            mod_gpxfield.GPXField('version', attribute=True),
            mod_gpxfield.GPXField('creator', attribute=True),
            mod_gpxfield.GPXField('name'),
            mod_gpxfield.GPXField('description', 'desc'),
            mod_gpxfield.GPXField('author_name', 'author'),
            mod_gpxfield.GPXField('author_email', 'email'),
            mod_gpxfield.GPXField('link', 'url'),
            mod_gpxfield.GPXField('link_text', 'urlname'),
            mod_gpxfield.GPXField('time', type=mod_gpxfield.TIME_TYPE),
            mod_gpxfield.GPXField('keywords'),
            mod_gpxfield.GPXComplexField('bounds', classs=GPXBounds),
            mod_gpxfield.GPXComplexField('waypoints', classs=GPXWaypoint, tag='wpt', is_list=True),
            mod_gpxfield.GPXComplexField('routes', classs=GPXRoute, tag='rte', is_list=True),
            mod_gpxfield.GPXComplexField('tracks', classs=GPXTrack, tag='trk', is_list=True),
    ]
    gpx_11_fields = [
            mod_gpxfield.GPXField('version', attribute=True),
            mod_gpxfield.GPXField('creator', attribute=True),
            'metadata',
                mod_gpxfield.GPXField('name', 'name'),
                mod_gpxfield.GPXField('description', 'desc'),
                'author',
                    mod_gpxfield.GPXField('author_name', 'name'),
                    mod_gpxfield.GPXEmailField('author_email', 'email'),
                    'link',
                        mod_gpxfield.GPXField('author_link', attribute='href'),
                        mod_gpxfield.GPXField('author_link_text', tag='text'),
                        mod_gpxfield.GPXField('author_link_type', tag='type'),
                    '/link',
                '/author',
                'copyright',
                    mod_gpxfield.GPXField('copyright_author', attribute='author'),
                    mod_gpxfield.GPXField('copyright_year', tag='year'),
                    mod_gpxfield.GPXField('copyright_license', tag='license'),
                '/copyright',
                'link',
                    mod_gpxfield.GPXField('link', attribute='href'),
                    mod_gpxfield.GPXField('link_text', tag='text'),
                    mod_gpxfield.GPXField('link_type', tag='type'),
                '/link',
                mod_gpxfield.GPXField('time', type=mod_gpxfield.TIME_TYPE),
                mod_gpxfield.GPXField('keywords'),
                mod_gpxfield.GPXComplexField('bounds', classs=GPXBounds),
                mod_gpxfield.GPXExtensionsField('metadata_extensions', tag='extensions'),
            '/metadata',
            mod_gpxfield.GPXComplexField('waypoints', classs=GPXWaypoint, tag='wpt', is_list=True),
            mod_gpxfield.GPXComplexField('routes', classs=GPXRoute, tag='rte', is_list=True),
            mod_gpxfield.GPXComplexField('tracks', classs=GPXTrack, tag='trk', is_list=True),
            mod_gpxfield.GPXExtensionsField('extensions'),
    ]

    __slots__ = ('version', 'creator', 'name', 'description', 'author_name',
                 'author_email', 'link', 'link_text', 'time', 'keywords',
                 'bounds', 'waypoints', 'routes', 'tracks', 'author_link',
                 'author_link_text', 'author_link_type', 'copyright_author',
                 'copyright_year', 'copyright_license', 'link_type',
                 'metadata_extensions', 'extensions')

    def __init__(self):
        self.version = None
        self.creator = None
        self.name = None
        self.description = None
        self.link = None
        self.link_text = None
        self.link_type = None
        self.time = None
        self.keywords = None
        self.bounds = None
        self.author_name = None
        self.author_email = None
        self.author_link = None
        self.author_link_text = None
        self.author_link_type = None
        self.copyright_author = None
        self.copyright_year = None
        self.copyright_license = None
        self.metadata_extensions = None
        self.extensions = None
        self.waypoints = []
        self.routes = []
        self.tracks = []

    def simplify(self, max_distance=None):
        """
        Simplify using the Ramer-Douglas-Peucker algorithm: http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
        """
        for track in self.tracks:
            track.simplify(max_distance=max_distance)

    def reduce_points(self, max_points_no=None, min_distance=None):
        """
        Reduces the number of points. Points will be updated in place.

        Parameters
        ----------

        max_points : int
            The maximum number of points to include in the GPX
        min_distance : float
            The minimum separation in meters between points
        """
        if max_points_no is None and min_distance is None:
            raise ValueError("Either max_point_no or min_distance must be supplied")

        if max_points_no is not None and max_points_no < 2:
            raise ValueError("max_points_no must be greater than or equal to 2")

        points_no = len(list(self.walk()))
        if max_points_no is not None and points_no <= max_points_no:
            # No need to reduce points only if no min_distance is specified:
            if not min_distance:
                return

        length = self.length_3d()

        min_distance = min_distance or 0
        max_points_no = max_points_no or 1000000000

        min_distance = max(min_distance, mod_math.ceil(length / float(max_points_no)))

        for track in self.tracks:
            track.reduce_points(min_distance)

        # TODO
        mod_logging.debug('Track reduced to %s points' % self.get_track_points_no())

    def adjust_time(self, delta):
        """
        Adjusts the time of all points in all of the segments of all tracks by
        the specified delta.

        Parameters
        ----------
        delta : datetime.timedelta
            Positive time delta will adjust times into the future
            Negative time delta will adjust times into the past
        """
        if self.time:
            self.time += delta
        for track in self.tracks:
            track.adjust_time(delta)

    def remove_time(self):
        """ Removes time data. """
        for track in self.tracks:
            track.remove_time()

    def remove_elevation(self, tracks=True, routes=False, waypoints=False):
        """ Removes elevation data. """
        if tracks:
            for track in self.tracks:
                track.remove_elevation()
        if routes:
            for route in self.routes:
                route.remove_elevation()
        if waypoints:
            for waypoint in self.waypoints:
                waypoint.remove_elevation()

    def get_time_bounds(self):
        """
        Gets the time bounds (start and end) of the GPX file.

        Returns
        ----------
        time_bounds : TimeBounds named tuple
            start_time : datetime
                Start time of the first segment in track
            end time : datetime
                End time of the last segment in track
        """
        start_time = None
        end_time = None

        for track in self.tracks:
            track_start_time, track_end_time = track.get_time_bounds()
            if not start_time:
                start_time = track_start_time
            if track_end_time:
                end_time = track_end_time

        return TimeBounds(start_time, end_time)

    def get_bounds(self):
        """
        Gets the latitude and longitude bounds of the GPX file.

        Returns
        ----------
        bounds : Bounds named tuple
            min_latitude : float
                Minimum latitude of track in decimal degrees [-90, 90]
            max_latitude : float
                Maxium latitude of track in decimal degrees [-90, 90]
            min_longitude : float
                Minium longitude of track in decimal degrees [-180, 180]
            max_longitude : float
                Maxium longitude of track in decimal degrees [-180, 180]
        """
        min_lat = None
        max_lat = None
        min_lon = None
        max_lon = None
        for track in self.tracks:
            bounds = track.get_bounds()

            if not mod_utils.is_numeric(min_lat) or bounds.min_latitude < min_lat:
                min_lat = bounds.min_latitude
            if not mod_utils.is_numeric(max_lat) or bounds.max_latitude > max_lat:
                max_lat = bounds.max_latitude
            if not mod_utils.is_numeric(min_lon) or bounds.min_longitude < min_lon:
                min_lon = bounds.min_longitude
            if not mod_utils.is_numeric(max_lon) or bounds.max_longitude > max_lon:
                max_lon = bounds.max_longitude

        return GPXBounds(min_lat, max_lat, min_lon, max_lon)

    def get_points_no(self):
        """
        Get the number of points in all segments of all track.

        Returns
        ----------
        num_points : integer
            Number of points in GPX
        """
        result = 0
        for track in self.tracks:
            result += track.get_points_no()
        return result

    def refresh_bounds(self):
        """
        Compute bounds and reload min_latitude, max_latitude, min_longitude
        and max_longitude properties of this object
        """

        bounds = self.get_bounds()

        self.bounds = bounds

    def smooth(self, vertical=True, horizontal=False, remove_extremes=False):
        """ See GPXTrackSegment.smooth(...) """
        for track in self.tracks:
            track.smooth(vertical=vertical, horizontal=horizontal, remove_extremes=remove_extremes)

    def remove_empty(self):
        """ Removes segments, routes """

        routes = []

        for route in self.routes:
            if len(route.points) > 0:
                routes.append(route)

        self.routes = routes

        for track in self.tracks:
            track.remove_empty()

    def get_moving_data(self, stopped_speed_threshold=None):
        """
        Return a tuple of (moving_time, stopped_time, moving_distance, stopped_distance, max_speed)
        that may be used for detecting the time stopped, and max speed. Not that those values are not
        absolutely true, because the "stopped" or "moving" information aren't saved in the track.

        Because of errors in the GPS recording, it may be good to calculate them on a reduced and
        smoothed version of the track. Something like this:

        cloned_gpx = gpx.clone()
        cloned_gpx.reduce_points(2000, min_distance=10)
        cloned_gpx.smooth(vertical=True, horizontal=True)
        cloned_gpx.smooth(vertical=True, horizontal=False)
        moving_time, stopped_time, moving_distance, stopped_distance, max_speed_ms = cloned_gpx.get_moving_data
        max_speed_kmh = max_speed_ms * 60. ** 2 / 1000.

        Experiment with your own variations to get the values you expect.

        Max speed is in m/s.
        """
        moving_time = 0.
        stopped_time = 0.

        moving_distance = 0.
        stopped_distance = 0.

        max_speed = 0.

        for track in self.tracks:
            track_moving_time, track_stopped_time, track_moving_distance, track_stopped_distance, track_max_speed = track.get_moving_data(stopped_speed_threshold)
            moving_time += track_moving_time
            stopped_time += track_stopped_time
            moving_distance += track_moving_distance
            stopped_distance += track_stopped_distance

            if track_max_speed > max_speed:
                max_speed = track_max_speed

        return MovingData(moving_time, stopped_time, moving_distance, stopped_distance, max_speed)

    def split(self, track_no, track_segment_no, track_point_no):
        """
        Splits one of the segments of a track in two parts. If one of the
        split segments is empty it will not be added in the result. The
        segments will be split in place.

        Parameters
        ----------
        track_no : integer
            The index of the track to split
        track_segment_no : integer
            The index of the segment to split
        track_point_no : integer
            The index of the track point in the segment to split
        """
        track = self.tracks[track_no]

        track.split(track_segment_no=track_segment_no, track_point_no=track_point_no)

    def length_2d(self):
        """
        Computes 2-dimensional length of the GPX file (only latitude and
        longitude, no elevation). This is the sum of 3D length of all segments
        in all tracks.

        Returns
        ----------
        length : float
            Length returned in meters
        """
        result = 0
        for track in self.tracks:
            length = track.length_2d()
            if length or length == 0:
                result += length
        return result

    def length_3d(self):
        """
        Computes 3-dimensional length of the GPX file (latitude, longitude, and
        elevation). This is the sum of 3D length of all segments in all tracks.

        Returns
        ----------
        length : float
            Length returned in meters
        """
        result = 0
        for track in self.tracks:
            length = track.length_3d()
            if length or length == 0:
                result += length
        return result

    def walk(self, only_points=False):
        """
        Generator used to iterates through points in GPX file

        Parameters
        ----------
        only_point s: boolean
            Only yield points while walking

        Yields
        ----------
        point : GPXTrackPoint
            Point in the track
        track_no : integer
            Index of track containint point. This is suppressed if only_points
            is True.
        segment_no : integer
            Index of segment containint point. This is suppressed if only_points
            is True.
        point_no : integer
            Index of point. This is suppressed if only_points is True.
        """
        for track_no, track in enumerate(self.tracks):
            for segment_no, segment in enumerate(track.segments):
                for point_no, point in enumerate(segment.points):
                    if only_points:
                        yield point
                    else:
                        yield point, track_no, segment_no, point_no

    def get_track_points_no(self):
        """ Number of track points, *without* route and waypoints """
        result = 0

        for track in self.tracks:
            for segment in track.segments:
                result += len(segment.points)

        return result

    def get_duration(self):
        """
        Calculates duration of GPX file

        Returns
        -------
        duration: float
            Duration in seconds or None if time data is not fully populated.
        """
        if not self.tracks:
            return 0

        result = 0
        for track in self.tracks:
            duration = track.get_duration()
            if duration or duration == 0:
                result += duration
            elif duration is None:
                return None

        return result

    def get_uphill_downhill(self):
        """
        Calculates the uphill and downhill elevation climbs for the gpx file.
        If elevation for some points is not found those are simply ignored.

        Returns
        -------
        uphill_downhill: UphillDownhill named tuple
            uphill: float
                Uphill elevation climbs in meters
            downhill: float
                Downhill elevation descent in meters
        """
        if not self.tracks:
            return UphillDownhill(0, 0)

        uphill = 0
        downhill = 0

        for track in self.tracks:
            current_uphill, current_downhill = track.get_uphill_downhill()

            uphill += current_uphill
            downhill += current_downhill

        return UphillDownhill(uphill, downhill)

    def get_location_at(self, time):
        """
        Gets approx. location at given time. Note that, at the moment this
        method returns an instance of GPXTrackPoint in the future -- this may
        be a mod_geo.Location instance with approximated latitude, longitude
        and elevation!
        """
        result = []
        for track in self.tracks:
            locations = track.get_location_at(time)
            for location in locations:
                result.append(location)

        return result

    def get_elevation_extremes(self):
        """
        Calculate elevation extremes of GPX file

        Returns
        -------
        min_max_elevation: MinimumMaximum named tuple
            minimum: float
                Minimum elevation in meters
            maximum: float
                Maximum elevation in meters
        """
        if not self.tracks:
            return MinimumMaximum(None, None)

        elevations = []

        for track in self.tracks:
            (_min, _max) = track.get_elevation_extremes()
            if _min is not None:
                elevations.append(_min)
            if _max is not None:
                elevations.append(_max)

        if len(elevations) == 0:
            return MinimumMaximum(None, None)

        return MinimumMaximum(min(elevations), max(elevations))

    def get_points_data(self, distance_2d=False):
        """
        Returns a list of tuples containing the actual point, its distance from the start,
        track_no, segment_no, and segment_point_no
        """
        distance_from_start = 0
        previous_point = None

        # (point, distance_from_start) pairs:
        points = []

        for track_no in range(len(self.tracks)):
            track = self.tracks[track_no]
            for segment_no in range(len(track.segments)):
                segment = track.segments[segment_no]
                for point_no in range(len(segment.points)):
                    point = segment.points[point_no]
                    if previous_point and point_no > 0:
                        if distance_2d:
                            distance = point.distance_2d(previous_point)
                        else:
                            distance = point.distance_3d(previous_point)

                        distance_from_start += distance

                    points.append(PointData(point, distance_from_start, track_no, segment_no, point_no))

                    previous_point = point

        return points

    def get_nearest_locations(self, location, threshold_distance=0.01):
        """
        Returns a list of locations of elements like
        consisting of points where the location may be on the track

        threshold_distance is the the minimum distance from the track
        so that the point *may* be counted as to be "on the track".
        For example 0.01 means 1% of the track distance.
        """

        assert location
        assert threshold_distance

        result = []

        points = self.get_points_data()

        if not points:
            return ()

        distance = points[- 1][1]

        threshold = distance * threshold_distance

        min_distance_candidate = None
        distance_from_start_candidate = None
        track_no_candidate = None
        segment_no_candidate = None
        point_no_candidate = None

        for point, distance_from_start, track_no, segment_no, point_no in points:
            distance = location.distance_3d(point)
            if distance < threshold:
                if min_distance_candidate is None or distance < min_distance_candidate:
                    min_distance_candidate = distance
                    distance_from_start_candidate = distance_from_start
                    track_no_candidate = track_no
                    segment_no_candidate = segment_no
                    point_no_candidate = point_no
            else:
                if distance_from_start_candidate is not None:
                    result.append((distance_from_start_candidate, track_no_candidate, segment_no_candidate, point_no_candidate))
                min_distance_candidate = None
                distance_from_start_candidate = None
                track_no_candidate = None
                segment_no_candidate = None
                point_no_candidate = None

        if distance_from_start_candidate is not None:
            result.append(NearestLocationData(distance_from_start_candidate, track_no_candidate, segment_no_candidate, point_no_candidate))

        return result

    def get_nearest_location(self, location):
        """ Returns (location, track_no, track_segment_no, track_point_no) for the
        nearest location on map """
        if not self.tracks:
            return None

        result = None
        distance = None
        result_track_no = None
        result_segment_no = None
        result_point_no = None
        for i in range(len(self.tracks)):
            track = self.tracks[i]
            nearest_location, track_segment_no, track_point_no = track.get_nearest_location(location)
            nearest_location_distance = None
            if nearest_location:
                nearest_location_distance = nearest_location.distance_2d(location)
            if not distance or nearest_location_distance < distance:
                result = nearest_location
                distance = nearest_location_distance
                result_track_no = i
                result_segment_no = track_segment_no
                result_point_no = track_point_no

        return NearestLocationData(result, result_track_no, result_segment_no, result_point_no)

    def add_elevation(self, delta):
        """
        Adjusts elevation data of GPX data.

        Parameters
        ----------
        delta : float
            Elevation delta in meters to apply to GPX data
        """
        for track in self.tracks:
            track.add_elevation(delta)

    def add_missing_data(self, get_data_function, add_missing_function):
        for track in self.tracks:
            track.add_missing_data(get_data_function, add_missing_function)

    def add_missing_elevations(self):
        def _add(interval, start, end, distances_ratios):
            assert start
            assert end
            assert start.elevation is not None
            assert end.elevation is not None
            assert interval
            assert len(interval) == len(distances_ratios)
            for i in range(len(interval)):
                interval[i].elevation = start.elevation + distances_ratios[i] * (end.elevation - start.elevation)

        self.add_missing_data(get_data_function=lambda point: point.elevation,
                              add_missing_function=_add)

    def add_missing_times(self):
        def _add(interval, start, end, distances_ratios):
            if (not start) or (not end) or (not start.time) or (not end.time):
                return
            assert interval
            assert len(interval) == len(distances_ratios)

            seconds_between = float(mod_utils.total_seconds(end.time - start.time))

            for i in range(len(interval)):
                point = interval[i]
                ratio = distances_ratios[i]
                point.time = start.time + mod_datetime.timedelta(
                    seconds=ratio * seconds_between)

        self.add_missing_data(get_data_function=lambda point: point.time,
                              add_missing_function=_add)

    def add_missing_speeds(self):
        """
        The missing speeds are added to a segment.

        The weighted harmonic mean is used to approximate the speed at
        a :obj:'~.GPXTrackPoint'.
        For this to work the speed of the first and last track point in a
        segment needs to be known.
        """
        def _add(interval, start, end, distances_ratios):
            if (not start) or (not end) or (not start.time) or (not end.time):
                return
            assert interval
            assert len(interval) == len(distances_ratios)

            time_dist_before = (interval[0].time_difference(start),
                                interval[0].distance_3d(start))
            time_dist_after = (interval[-1].time_difference(end),
                               interval[-1].distance_3d(end))

            # Assemble list of times and distance to neighboring points
            times_dists = [(interval[i].time_difference(interval[i+1]),
                            interval[i].distance_3d(interval[i+1]))
                            for i in range(len(interval) - 1)]
            times_dists.insert(0, time_dist_before)
            times_dists.append(time_dist_after)

            for i, point in enumerate(interval):
                time_left, dist_left = times_dists[i]
                time_right, dist_right = times_dists[i+1]
                point.speed = float(dist_left + dist_right) / (time_left + time_right)

        self.add_missing_data(get_data_function=lambda point: point.speed,
                              add_missing_function=_add)

    def move(self, location_delta):
        """
        Moves each point in the gpx file (routes, waypoints, tracks).

        Parameters
        ----------
        location_delta: LocationDelta
            LocationDelta to move each point
        """
        for route in self.routes:
            route.move(location_delta)

        for waypoint in self.waypoints:
            waypoint.move(location_delta)

        for track in self.tracks:
            track.move(location_delta)

    def to_xml(self, version=None):
        """
        FIXME: Note, this method will change self.version
        """
        if not version:
            if self.version:
                version = self.version
            else:
                version = '1.0'

        if version != '1.0' and version != '1.1':
            raise GPXException('Invalid version %s' % version)

        self.version = version
        if not self.creator:
            self.creator = 'gpx.py -- https://github.com/tkrajina/gpxpy'

        v = version.replace('.', '/')
        xml_attributes = {
                'xmlns:xsi': 'http://www.w3.org/2001/XMLSchema-instance',
                'xmlns': 'http://www.topografix.com/GPX/%s' % v,
                'xsi:schemaLocation': 'http://www.topografix.com/GPX/%s http://www.topografix.com/GPX/%s/gpx.xsd' % (v, v)
        }

        content = mod_gpxfield.gpx_fields_to_xml(self, 'gpx', version, custom_attributes=xml_attributes)

        return '<?xml version="1.0" encoding="UTF-8"?>\n' + content.strip()

    def has_times(self):
        """ See GPXTrackSegment.has_times() """
        if not self.tracks:
            return None

        result = True
        for track in self.tracks:
            result = result and track.has_times()

        return result

    def has_elevations(self):
        """ See GPXTrackSegment.has_elevations()) """
        if not self.tracks:
            return None

        result = True
        for track in self.tracks:
            result = result and track.has_elevations()

        return result

    def __hash__(self):
        return mod_utils.hash_object(self, self.__slots__)

    def __repr__(self):
        representation = ''
        for attribute in 'waypoints', 'routes', 'tracks':
            value = getattr(self, attribute)
            if value:
                representation += '%s%s=%s' % (', ' if representation else '', attribute, repr(value))
        return 'GPX(%s)' % representation

    def clone(self):
        return mod_copy.deepcopy(self)

# Add attributes and fill default values (lists or None) for all GPX elements:
for var_name in dir():
    var_value = vars()[var_name]
    if hasattr(var_value, 'gpx_10_fields') or hasattr(var_value, 'gpx_11_fields'):
        #print('Check/fill %s' % var_value)
        mod_gpxfield.gpx_check_slots_and_default_values(var_value)