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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