#!/usr/bin/env python ############################################################################### # $Id$ # # Project: GDAL/OGR Test Suite # Purpose: Test Polygonize() algorithm. # Author: Frank Warmerdam # ############################################################################### # 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. ############################################################################### import os import sys sys.path.append( '../pymod' ) import gdaltest import ogrtest try: from osgeo import gdal, gdalconst, ogr except: import gdal import gdalconst import ogr ############################################################################### # Test a fairly simple case, with nodata masking. def polygonize_1(): try: x = gdal.Polygonize gdaltest.have_ng = 1 except: gdaltest.have_ng = 0 return 'skip' src_ds = gdal.Open('data/polygonize_in.grd') src_band = src_ds.GetRasterBand(1) # Create a memory OGR datasource to put results in. mem_drv = ogr.GetDriverByName( 'Memory' ) mem_ds = mem_drv.CreateDataSource( 'out' ) mem_layer = mem_ds.CreateLayer( 'poly', None, ogr.wkbPolygon ) fd = ogr.FieldDefn( 'DN', ogr.OFTInteger ) mem_layer.CreateField( fd ) # run the algorithm. result = gdal.Polygonize( src_band, src_band.GetMaskBand(), mem_layer, 0 ) # Confirm we get the set of expected features in the output layer. expected_feature_number = 13 if mem_layer.GetFeatureCount() != expected_feature_number: gdaltest.post_reason( 'GetFeatureCount() returned %d instead of %d' % (mem_layer.GetFeatureCount(), expected_feature_number) ) return 'fail' expect = [ 107, 123, 115, 115, 140, 148, 123, 140, 156, 100, 101, 102, 103] tr = ogrtest.check_features_against_list( mem_layer, 'DN', expect ) # check at least one geometry. if tr: mem_layer.SetAttributeFilter( 'dn = 156' ) feat_read = mem_layer.GetNextFeature() if ogrtest.check_feature_geometry( feat_read, 'POLYGON ((440720 3751200,440720 3751020,440900 3751020,440900 3751200,440720 3751200),(440780 3751140,440840 3751140,440840 3751080,440780 3751080,440780 3751140))' ) != 0: tr = 0 feat_read.Destroy() if tr: return 'success' else: return 'fail' ############################################################################### # Test a simple case without masking. def polygonize_2(): if not gdaltest.have_ng: return 'skip' src_ds = gdal.Open('data/polygonize_in.grd') src_band = src_ds.GetRasterBand(1) # Create a memory OGR datasource to put results in. mem_drv = ogr.GetDriverByName( 'Memory' ) mem_ds = mem_drv.CreateDataSource( 'out' ) mem_layer = mem_ds.CreateLayer( 'poly', None, ogr.wkbPolygon ) fd = ogr.FieldDefn( 'DN', ogr.OFTInteger ) mem_layer.CreateField( fd ) # run the algorithm. result = gdal.Polygonize( src_band, None, mem_layer, 0 ) # Confirm we get the set of expected features in the output layer. expected_feature_number = 17 if mem_layer.GetFeatureCount() != expected_feature_number: gdaltest.post_reason( 'GetFeatureCount() returned %d instead of %d' % (mem_layer.GetFeatureCount(), expected_feature_number) ) return 'fail' expect = [ 107, 123, 115, 132, 115, 132, 140, 132, 148, 123, 140, 132, 156, 100, 101, 102, 103 ] tr = ogrtest.check_features_against_list( mem_layer, 'DN', expect ) if tr: return 'success' else: return 'fail' ############################################################################### # A more involved case with a complex looping. def polygonize_3(): if not gdaltest.have_ng: return 'skip' src_ds = gdal.Open('data/polygonize_in_2.grd') src_band = src_ds.GetRasterBand(1) # Create a memory OGR datasource to put results in. mem_drv = ogr.GetDriverByName( 'Memory' ) mem_ds = mem_drv.CreateDataSource( 'out' ) mem_layer = mem_ds.CreateLayer( 'poly', None, ogr.wkbPolygon ) fd = ogr.FieldDefn( 'DN', ogr.OFTInteger ) mem_layer.CreateField( fd ) # run the algorithm. result = gdal.Polygonize( src_band, None, mem_layer, 0 ) # Confirm we get the expected count of features. expected_feature_number = 125 if mem_layer.GetFeatureCount() != expected_feature_number: gdaltest.post_reason( 'GetFeatureCount() returned %d instead of %d' % (mem_layer.GetFeatureCount(), expected_feature_number) ) return 'fail' # check at least one geometry. mem_layer.SetAttributeFilter( 'dn = 0' ) feat_read = mem_layer.GetNextFeature() if ogrtest.check_feature_geometry( feat_read, 'POLYGON ((6 -3,6 -40,19 -40,19 -39,24 -39,25 -39,25 -38,26 -38,27 -38,27 -37,28 -37,28 -36,29 -36,29 -35,30 -35,30 -34,31 -34,31 -25,30 -25,30 -24,29 -24,29 -23,28 -23,28 -22,27 -22,27 -21,24 -21,24 -20,23 -20,23 -19,25 -19,26 -19,26 -18,27 -18,27 -17,28 -17,28 -16,29 -16,29 -8,28 -8,28 -7,27 -7,27 -6,26 -6,26 -5,24 -5,24 -4,18 -4,18 -3,6 -3),(24 -35,25 -35,26 -35,26 -33,27 -33,27 -25,26 -25,26 -23,24 -23,24 -22,11 -22,11 -36,24 -36,24 -35),(11 -7,11 -18,23 -18,23 -17,24 -17,24 -16,25 -16,25 -9,24 -9,24 -8,23 -8,23 -7,11 -7))' ) != 0: print(feat_read.GetGeometryRef().ExportToWkt()) tr = 0 else: tr = 1 feat_read.Destroy() if tr: return 'success' else: return 'fail' ############################################################################### # Test a simple case without masking but with 8-connectedness. def polygonize_4(): if not gdaltest.have_ng: return 'skip' src_ds = gdal.Open('data/polygonize_in.grd') src_band = src_ds.GetRasterBand(1) # Create a memory OGR datasource to put results in. mem_drv = ogr.GetDriverByName( 'Memory' ) mem_ds = mem_drv.CreateDataSource( 'out' ) mem_layer = mem_ds.CreateLayer( 'poly', None, ogr.wkbPolygon ) fd = ogr.FieldDefn( 'DN', ogr.OFTInteger ) mem_layer.CreateField( fd ) # run the algorithm. result = gdal.Polygonize( src_band, None, mem_layer, 0, ["8CONNECTED=8"] ) # Confirm we get the set of expected features in the output layer. expected_feature_number = 16 if mem_layer.GetFeatureCount() != expected_feature_number: gdaltest.post_reason( 'GetFeatureCount() returned %d instead of %d' % (mem_layer.GetFeatureCount(), expected_feature_number) ) return 'fail' expect = [ 107, 123, 132, 115, 132, 115, 140, 148, 123, 140, 132, 156, 100, 101, 102, 103 ] tr = ogrtest.check_features_against_list( mem_layer, 'DN', expect ) if tr: return 'success' else: return 'fail' gdaltest_list = [ polygonize_1, polygonize_2, polygonize_3, polygonize_4 ] if __name__ == '__main__': gdaltest.setup_run( 'polygonize' ) gdaltest.run_tests( gdaltest_list ) gdaltest.summarize()