[23] | 1 | #!/usr/bin/env python |
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| 2 | #****************************************************************************** |
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| 3 | # $Id: gdal_polygonize.py 18306 2009-12-15 18:57:11Z rouault $ |
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| 4 | # |
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| 5 | # Project: GDAL Python Interface |
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| 6 | # Purpose: Application for converting raster data to a vector polygon layer. |
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| 7 | # Author: Frank Warmerdam, warmerdam@pobox.com |
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| 8 | # |
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| 9 | #****************************************************************************** |
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| 10 | # Copyright (c) 2008, Frank Warmerdam |
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| 11 | # |
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| 12 | # Permission is hereby granted, free of charge, to any person obtaining a |
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| 13 | # copy of this software and associated documentation files (the "Software"), |
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| 14 | # to deal in the Software without restriction, including without limitation |
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| 15 | # the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 16 | # and/or sell copies of the Software, and to permit persons to whom the |
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| 17 | # Software is furnished to do so, subject to the following conditions: |
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| 18 | # |
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| 19 | # The above copyright notice and this permission notice shall be included |
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| 20 | # in all copies or substantial portions of the Software. |
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| 21 | # |
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| 22 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 23 | # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 24 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 25 | # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 26 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 27 | # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 28 | # DEALINGS IN THE SOFTWARE. |
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| 29 | #****************************************************************************** |
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| 30 | |
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| 31 | try: |
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| 32 | from osgeo import gdal, ogr, osr |
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| 33 | except ImportError: |
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| 34 | import gdal, ogr, osr |
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| 35 | |
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| 36 | import sys |
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| 37 | import os.path |
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| 38 | |
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| 39 | def Usage(): |
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| 40 | print(""" |
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| 41 | gdal_polygonize [-o name=value] [-nomask] [-mask filename] raster_file [-b band] |
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| 42 | [-q] [-f ogr_format] out_file [layer] [fieldname] |
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| 43 | """) |
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| 44 | sys.exit(1) |
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| 45 | |
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| 46 | # ============================================================================= |
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| 47 | # Mainline |
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| 48 | # ============================================================================= |
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| 49 | |
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| 50 | format = 'GML' |
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| 51 | options = [] |
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| 52 | quiet_flag = 0 |
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| 53 | src_filename = None |
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| 54 | src_band_n = 1 |
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| 55 | |
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| 56 | dst_filename = None |
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| 57 | dst_layername = None |
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| 58 | dst_fieldname = None |
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| 59 | dst_field = -1 |
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| 60 | |
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| 61 | mask = 'default' |
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| 62 | |
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| 63 | gdal.AllRegister() |
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| 64 | argv = gdal.GeneralCmdLineProcessor( sys.argv ) |
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| 65 | if argv is None: |
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| 66 | sys.exit( 0 ) |
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| 67 | |
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| 68 | # Parse command line arguments. |
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| 69 | i = 1 |
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| 70 | while i < len(argv): |
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| 71 | arg = argv[i] |
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| 72 | |
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| 73 | if arg == '-f': |
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| 74 | i = i + 1 |
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| 75 | format = argv[i] |
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| 76 | |
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| 77 | elif arg == '-q' or arg == '-quiet': |
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| 78 | quiet_flag = 1 |
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| 79 | |
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| 80 | elif arg == '-nomask': |
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| 81 | mask = 'none' |
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| 82 | |
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| 83 | elif arg == '-mask': |
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| 84 | i = i + 1 |
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| 85 | mask = argv[i] |
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| 86 | |
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| 87 | elif arg == '-b': |
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| 88 | i = i + 1 |
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| 89 | src_band_n = int(argv[i]) |
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| 90 | |
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| 91 | elif src_filename is None: |
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| 92 | src_filename = argv[i] |
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| 93 | |
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| 94 | elif dst_filename is None: |
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| 95 | dst_filename = argv[i] |
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| 96 | |
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| 97 | elif dst_layername is None: |
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| 98 | dst_layername = argv[i] |
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| 99 | |
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| 100 | elif dst_fieldname is None: |
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| 101 | dst_fieldname = argv[i] |
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| 102 | |
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| 103 | else: |
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| 104 | Usage() |
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| 105 | |
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| 106 | i = i + 1 |
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| 107 | |
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| 108 | if src_filename is None or dst_filename is None: |
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| 109 | Usage() |
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| 110 | |
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| 111 | if dst_layername is None: |
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| 112 | dst_layername = 'out' |
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| 113 | |
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| 114 | # ============================================================================= |
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| 115 | # Verify we have next gen bindings with the polygonize method. |
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| 116 | # ============================================================================= |
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| 117 | try: |
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| 118 | gdal.Polygonize |
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| 119 | except: |
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| 120 | print('') |
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| 121 | print('gdal.Polygonize() not available. You are likely using "old gen"') |
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| 122 | print('bindings or an older version of the next gen bindings.') |
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| 123 | print('') |
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| 124 | sys.exit(1) |
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| 125 | |
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| 126 | # ============================================================================= |
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| 127 | # Open source file |
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| 128 | # ============================================================================= |
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| 129 | |
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| 130 | src_ds = gdal.Open( src_filename ) |
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| 131 | |
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| 132 | if src_ds is None: |
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| 133 | print('Unable to open ', src_filename) |
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| 134 | sys.exit(1) |
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| 135 | |
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| 136 | srcband = src_ds.GetRasterBand(src_band_n) |
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| 137 | |
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| 138 | if mask is 'default': |
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| 139 | maskband = srcband.GetMaskBand() |
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| 140 | elif mask is 'none': |
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| 141 | maskband = None |
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| 142 | else: |
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| 143 | mask_ds = gdal.Open( mask ) |
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| 144 | maskband = mask_ds.GetRasterBand(1) |
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| 145 | |
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| 146 | # ============================================================================= |
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| 147 | # Try opening the destination file as an existing file. |
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| 148 | # ============================================================================= |
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| 149 | |
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| 150 | try: |
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| 151 | gdal.PushErrorHandler( 'QuietErrorHandler' ) |
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| 152 | dst_ds = ogr.Open( dst_filename, update=1 ) |
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| 153 | gdal.PopErrorHandler() |
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| 154 | except: |
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| 155 | dst_ds = None |
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| 156 | |
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| 157 | # ============================================================================= |
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| 158 | # Create output file. |
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| 159 | # ============================================================================= |
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| 160 | if dst_ds is None: |
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| 161 | drv = ogr.GetDriverByName(format) |
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| 162 | if not quiet_flag: |
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| 163 | print('Creating output %s of format %s.' % (dst_filename, format)) |
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| 164 | dst_ds = drv.CreateDataSource( dst_filename ) |
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| 165 | |
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| 166 | # ============================================================================= |
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| 167 | # Find or create destination layer. |
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| 168 | # ============================================================================= |
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| 169 | try: |
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| 170 | dst_layer = dst_ds.GetLayerByName(dst_layername) |
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| 171 | except: |
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| 172 | dst_layer = None |
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| 173 | |
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| 174 | if dst_layer is None: |
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| 175 | |
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| 176 | srs = None |
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| 177 | if src_ds.GetProjectionRef() != '': |
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| 178 | srs = osr.SpatialReference() |
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| 179 | srs.ImportFromWkt( src_ds.GetProjectionRef() ) |
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| 180 | |
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| 181 | dst_layer = dst_ds.CreateLayer(dst_layername, srs = srs ) |
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| 182 | |
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| 183 | if dst_fieldname is None: |
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| 184 | dst_fieldname = 'DN' |
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| 185 | |
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| 186 | fd = ogr.FieldDefn( dst_fieldname, ogr.OFTInteger ) |
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| 187 | dst_layer.CreateField( fd ) |
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| 188 | dst_field = 0 |
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| 189 | |
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| 190 | # ============================================================================= |
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| 191 | # Invoke algorithm. |
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| 192 | # ============================================================================= |
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| 193 | |
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| 194 | if quiet_flag: |
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| 195 | prog_func = None |
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| 196 | else: |
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| 197 | prog_func = gdal.TermProgress |
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| 198 | |
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| 199 | result = gdal.Polygonize( srcband, maskband, dst_layer, dst_field, options, |
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| 200 | callback = prog_func ) |
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| 201 | |
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| 202 | srcband = None |
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| 203 | dst_ds = None |
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| 204 | |
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| 205 | |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | |
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| 210 | |
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| 211 | |
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