/usr/share/gnudatalanguage/coyote/cgfindmapboundary.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; cgFINDMAPBOUNDARY
;
; PURPOSE:
;
; Utility routine to find the map projection grid boundary from a file,
; if it is possible to do so. Currently works with GeoTIFF files, CF 1.4
; compliant netCDF files, and GPD files created with the GPD_Viewer software
; from the Catatlyst Library.
;******************************************************************************************;
; ;
; Copyright (c) 2012, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; Utility routine to find the map projection grid boundary from a file,
; if it is possible to do so. Currently works with GeoTIFF files, CF 1.4
; compliant netCDF files, and GPD files created with the GPD_Viewer software
; from the Catatlyst Library.
;
; :Categories:
; Utility
;
; :Returns:
; The return value is either a 1, indicating a boundary can be found, or a 0 indicating
; that the boundary could not be found.
;
; :Params:
; filename: in, required, type='string'
; The name of a filename to open to see if a projected map grid boundary can be found.
; boundary: out, optional, type=float
; The boundary of the image in projected meter space, in the form [x0,y0,x1,y1].
;
; :Keywords:
; use_latlon: in, optional, type=boolean, default=0
; If the filename is a netCDF file, set this keyword to force the boundary
; to be determined by reading the include latitude/longitude arrays.
; utm_south: in, optional, type=boolean, default=0
; Set this keyword to add 10e6 to each of the Y values. This is sometimes
; necessary with LandSat images in the Southern hemisphere, where the Y values
; are given in negative values to indicate southern UTM zones.
; xrange: out, optional, type=float
; A two element vector: boundary[[0,2]]
; yrange: out, optional, type=float
; A two element vector: boundary[[1,3]]
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Written by: David W. Fanning, 23 February 2010.::
; Added XRANGE and YRANGE keywords. 25 February 2010. DWF
; Added USE_LATLON keyword for finding boundary of netCDF files containing latitude
; and longitude arrays. 6 April 2010. DWF.
; Added UTM_SOUTH keyword to handle Landsat dat in UTM projections in GeoTiff files
; that have to have 10e6 added to Y values to make them work in IDL. 14 Aug 2012. DWF.
; Renamed cgFindMapBoundary from FindMapBoundary. 21 Aug 2012. DWF.
; Changed reference to NCDF_Coord to cgNCDFMap. 28 Oct 2012. DWF.
;
; :Copyright:
; Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
FUNCTION cgFindMapBoundary, filename, boundary, $
USE_LATLON=use_latlon, $
UTM_SOUTH=utm_south, $
XRANGE=xrange, $
YRANGE=yrange
COMPILE_OPT idl2
On_Error, 2
; Is this a GeoTIFF file:
isGeoTiff = Query_Tiff(filename, geoInfo, GEOTIFF=geoStruct)
; If it is a GeoTiff file, do this.
IF isGeoTiff THEN BEGIN
xscale = geoStruct.ModelPixelScaleTag[0]
yscale = geoStruct.ModelPixelScaleTag[1]
tp = geoStruct.ModelTiePointTag[3:4]
dims = geoInfo.dimensions
xsize = dims[0]
ysize = dims[1]
xOrigin = tp[0]
yOrigin = tp[1] - (yscale * ysize)
xEnd = xOrigin + (xscale * xsize)
yEnd = tp[1]
; Some UTM projections indicate southern hemisphere scenes with negative
; values for the lats. These have to have 10e6 added to them to work in IDL.
IF Keyword_Set(UTM_SOUTH) THEN BEGIN
yOrigin = yOrigin + 10e6
yEnd = yEnd + 10e6
ENDIF
boundary = [xOrigin, yOrigin, xEnd, yEnd]
xrange = boundary[[0,2]]
yrange = boundary[[1,3]]
RETURN, 1
ENDIF
; Is this an netCDF file?
isNCDF = NCDF_IsValidFile(filename)
IF isNCDF THEN BEGIN
mapCoord = cgNCDFMap(filename, XRANGE=xrange, YRANGE=yrange, $
SUCCESS=success, /SILENT, USE_LATLON=use_latlon)
IF success THEN BEGIN
boundary = [xrange[0], yrange[0], xrange[1], yrange[1]]
xrange = boundary[[0,2]]
yrange = boundary[[1,3]]
RETURN, 1
ENDIF
ENDIF
; Maybe it is a GPD file produced from the GPD_Viewer.
; If so, compute the limits from the file.
root_name = cgRootName(filename, EXTENSION=ext)
IF StrLowCase(ext) NE 'gpd' THEN $
Message, 'Do not recognize the file as one for which a ' + $
'grid boundary can be computed.'
; Read the file.
lines = File_Lines(filename)
OpenR, lun, filename, /Get_Lun
data = StrArr(lines)
ReadF, lun, data
Free_Lun, lun
upData = StrUpCase(data)
; Can you find the origins of the upper left corner and the grid
; height and width?
loc = StrPos(upData, 'MAP ORIGIN X:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
x0 = 0.0D
ReadS, thisLine, x0, FORMAT ='(30x, D0)'
ENDIF
loc = StrPos(upData, 'GRID UPPER-LEFT X:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
x0 = 0.0D
ReadS, thisLine, x0, FORMAT ='(30x, D0)'
ENDIF
loc = StrPos(upData, 'MAP ORIGIN Y:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
y1 = 0.0D
ReadS, thisLine, y1, FORMAT ='(30x, D0)'
ENDIF
loc = StrPos(upData, 'GRID UPPER-LEFT Y:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
y1 = 0.0D
ReadS, thisLine, y1, FORMAT ='(30x, D0)'
ENDIF
loc = StrPos(upData, 'GRID MAP UNITS PER CELL:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
mapunits = 0.0D
ReadS, thisLine, mapunits, FORMAT ='(30x, F0)'
ENDIF
loc = StrPos(upData, 'MAP SCALE:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
mapscale = 0.0D
ReadS, thisLine, mapscale, FORMAT ='(30x, F0)'
ENDIF
loc = StrPos(upData, 'GRID WIDTH:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
cols = 0L
ReadS, thisLine, cols, FORMAT ='(30x, I0)'
ENDIF
loc = StrPos(upData, 'GRID HEIGHT:')
index = Where(loc NE -1, count)
IF count GT 0 THEN BEGIN
thisLine = data[index[0]]
rows = 0L
ReadS, thisLine, rows, FORMAT ='(30x, I0)'
ENDIF
IF (N_Elements(x0) NE 0) AND $
(N_Elements(y1) NE 0) AND $
(N_Elements(mapunits) NE 0) AND $
(N_Elements(mapscale) NE 0) AND $
(N_Elements(cols) NE 0) AND $
(N_Elements(rows) NE 0) THEN BEGIN
x1 = x0 + cols*mapunits*mapscale
y0 = y1 - rows*mapunits*mapscale
boundary = [x0, y0, x1, y1]
xrange = boundary[[0,2]]
yrange = boundary[[1,3]]
RETURN, 1
ENDIF
; Can't find boundary, report no success.
RETURN, 0
END
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