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99 lines
3.4 KiB
Python
99 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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proximity.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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#******************************************************************************
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# Adapted from gdal_proximity.py, Copyright (c) 2008, Frank Warmerdam
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#******************************************************************************
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##[GDAL] Analysis=group
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##src_filename=raster
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##dst_filename=output raster
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##values=string
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##maxdist=number 0
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##nodata=number 0
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##distunits=selection GEO;PIXEL
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##fixed_buf_val=number 0
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from processing.gdal.GdalUtils import GdalUtils
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try:
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from osgeo import gdal
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except ImportError:
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import gdal
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creation_options = []
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options = []
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src_band_n = 1
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dst_band_n = 1
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creation_type = 'Float32'
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gdal.AllRegister()
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options.append( 'MAXDIST=' + str(maxdist))
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options.append( 'VALUES=' + values )
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options.append( 'DISTUNITS=' + str(distunits))
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options.append( 'NODATA=' + str(nodata))
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options.append( 'FIXED_BUF_VAL=' +str(fixed_buf_val))
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src_ds = gdal.Open( src_filename )
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srcband = src_ds.GetRasterBand(src_band_n)
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# =============================================================================
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# Try opening the destination file as an existing file.
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# =============================================================================
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try:
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driver = gdal.IdentifyDriver( dst_filename )
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if driver is not None:
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dst_ds = gdal.Open( dst_filename, gdal.GA_Update )
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dstband = dst_ds.GetRasterBand(dst_band_n)
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else:
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dst_ds = None
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except:
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dst_ds = None
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# =============================================================================
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# Create output file.
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# =============================================================================
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if dst_ds is None:
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drv = gdal.GetDriverByName(GdalUtils.getFormatShortNameFromFilename(dst_filename))
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dst_ds = drv.Create( dst_filename,
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src_ds.RasterXSize, src_ds.RasterYSize, 1,
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gdal.GetDataTypeByName(creation_type) )
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dst_ds.SetGeoTransform( src_ds.GetGeoTransform() )
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dst_ds.SetProjection( src_ds.GetProjectionRef() )
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dstband = dst_ds.GetRasterBand(1)
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# =============================================================================
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# Invoke algorithm.
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# =============================================================================
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prog_func = gdal.TermProgress
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gdal.ComputeProximity( srcband, dstband, options,
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callback = prog_func )
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srcband = None
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dstband = None
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src_ds = None
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dst_ds = None
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