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/usr/bin/gdal_fillnodata.py is in python-gdal 1.10.1+dfsg-5ubuntu1.

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#! /usr/bin/python
#******************************************************************************
#  $Id: gdal_fillnodata.py 23153 2011-10-01 13:40:24Z rouault $
# 
#  Project:  GDAL Python Interface
#  Purpose:  Application for filling nodata areas in a raster by interpolation
#  Author:   Frank Warmerdam, warmerdam@pobox.com
# 
#******************************************************************************
#  Copyright (c) 2008, Frank Warmerdam
# 
#  Permission is hereby granted, free of charge, to any person obtaining a
#  copy of this software and associated documentation files (the "Software"),
#  to deal in the Software without restriction, including without limitation
#  the rights to use, copy, modify, merge, publish, distribute, sublicense,
#  and/or sell copies of the Software, and to permit persons to whom the
#  Software is furnished to do so, subject to the following conditions:
# 
#  The above copyright notice and this permission notice shall be included
#  in all copies or substantial portions of the Software.
# 
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
#  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
#  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
#  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
#  DEALINGS IN THE SOFTWARE.
#******************************************************************************

try:
    from osgeo import gdal, ogr
except ImportError:
    import gdal
    import ogr

import sys
import os.path

def CopyBand( srcband, dstband ):
    for line in range(srcband.YSize):
        line_data = srcband.ReadRaster( 0, line, srcband.XSize, 1 )
        dstband.WriteRaster( 0, line, srcband.XSize, 1, line_data,
                             buf_type = srcband.DataType )
        
def Usage():
    print("""
gdal_fillnodata [-q] [-md max_distance] [-si smooth_iterations]
                [-o name=value] [-b band]
                srcfile [-nomask] [-mask filename] [-of format] [-co name=value]* [dstfile]
""")
    sys.exit(1)
    
# =============================================================================
# 	Mainline
# =============================================================================

max_distance = 100
smoothing_iterations = 0
options = []
quiet_flag = 0
src_filename = None
src_band = 1

dst_filename = None
format = 'GTiff'
creation_options = []

mask = 'default'

gdal.AllRegister()
argv = gdal.GeneralCmdLineProcessor( sys.argv )
if argv is None:
    sys.exit( 0 )

# Parse command line arguments.
i = 1
while i < len(argv):
    arg = argv[i]

    if arg == '-of':
        i = i + 1
        format = argv[i]

    elif arg == '-co':
        i = i + 1
        creation_options.append(argv[i])

    elif arg == '-q' or arg == '-quiet':
        quiet_flag = 1
        
    elif arg == '-si':
        i = i + 1
        smoothing_iterations = int(argv[i])
        
    elif arg == '-b':
        i = i + 1
        src_band = int(argv[i])
        
    elif arg == '-md':
        i = i + 1
        max_distance = float(argv[i])
        
    elif arg == '-nomask':
        mask = 'none'
        
    elif arg == '-mask':
        i = i + 1
        mask = argv[i]
        
    elif arg == '-mask':
        i = i + 1
        mask = argv[i]
        
    elif arg[:2] == '-h':
        Usage()
        
    elif src_filename is None:
        src_filename = argv[i]

    elif dst_filename is None:
        dst_filename = argv[i]

    else:
        Usage()

    i = i + 1

if src_filename is None:
    Usage()
    
# =============================================================================
# 	Verify we have next gen bindings with the sievefilter method.
# =============================================================================
try:
    gdal.FillNodata
except:
    print('')
    print('gdal.FillNodata() not available.  You are likely using "old gen"')
    print('bindings or an older version of the next gen bindings.')
    print('')
    sys.exit(1)

# =============================================================================
#	Open source file
# =============================================================================

if dst_filename is None:
    src_ds = gdal.Open( src_filename, gdal.GA_Update )
else:
    src_ds = gdal.Open( src_filename, gdal.GA_ReadOnly )
    
if src_ds is None:
    print('Unable to open %s' % src_filename)
    sys.exit(1)

srcband = src_ds.GetRasterBand(src_band)

if mask is 'default':
    maskband = srcband.GetMaskBand()
elif mask is 'none':
    maskband = None
else:
    mask_ds = gdal.Open( mask )
    maskband = mask_ds.GetRasterBand(1)

# =============================================================================
#       Create output file if one is specified.
# =============================================================================

if dst_filename is not None:

    drv = gdal.GetDriverByName(format)
    dst_ds = drv.Create( dst_filename,src_ds.RasterXSize, src_ds.RasterYSize,1,
                         srcband.DataType, creation_options )
    wkt = src_ds.GetProjection()
    if wkt != '':
        dst_ds.SetProjection( wkt )
    dst_ds.SetGeoTransform( src_ds.GetGeoTransform() )
    
    dstband = dst_ds.GetRasterBand(1)
    CopyBand( srcband, dstband )
    
else:
    dstband = srcband

# =============================================================================
#	Invoke algorithm.
# =============================================================================

if quiet_flag:
    prog_func = None
else:
    prog_func = gdal.TermProgress
    
result = gdal.FillNodata( dstband, maskband,
                          max_distance, smoothing_iterations, options,
                          callback = prog_func )


src_ds = None
dst_ds = None
mask_ds = None