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September 7, 2017 15:46
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Adapted the original ogr2vrt.py script to create a OSGB ready vrt file that references a tab file for use in QGIS - no more having to change the CRS!
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| #!/usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| ############################################################################### | |
| # $Id$ | |
| # | |
| # Project: OGR Python samples | |
| # Purpose: Create OGR VRT from source datasource | |
| # Author: Frank Warmerdam, warmerdam@pobox.com | |
| # | |
| ############################################################################### | |
| # Copyright (c) 2009, Frank Warmerdam <warmerdam@pobox.com> | |
| # Copyright (c) 2009-2014, Even Rouault <even dot rouault at mines-paris dot org> | |
| # | |
| # 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 sys | |
| from osgeo import ogr, gdal | |
| ############################################################################# | |
| def GeomType2Name( type ): | |
| flat_type = ogr.GT_Flatten(type) | |
| dic = { ogr.wkbUnknown : ('wkbUnknown', '25D'), | |
| ogr.wkbPoint : ('wkbPoint', '25D'), | |
| ogr.wkbLineString : ('wkbLineString', '25D'), | |
| ogr.wkbPolygon : ('wkbPolygon', '25D'), | |
| ogr.wkbMultiPoint : ('wkbMultiPoint', '25D'), | |
| ogr.wkbMultiLineString : ('wkbMultiLineString', '25D'), | |
| ogr.wkbMultiPolygon : ('wkbMultiPolygon', '25D'), | |
| ogr.wkbGeometryCollection : ('wkbGeometryCollection', '25D'), | |
| ogr.wkbNone : ('wkbNone', ''), | |
| ogr.wkbLinearRing : ('wkbLinearRing', ''), | |
| ogr.wkbCircularString : ('wkbCircularString', 'Z'), | |
| ogr.wkbCompoundCurve : ('wkbCompoundCurve', 'Z'), | |
| ogr.wkbCurvePolygon : ('wkbCurvePolygon', 'Z'), | |
| ogr.wkbMultiCurve : ('wkbMultiCurve', 'Z'), | |
| ogr.wkbMultiSurface : ('wkbMultiSurface', 'Z'), | |
| ogr.wkbCurve : ('wkbCurve', 'Z'), | |
| ogr.wkbSurface : ('wkbSurface', 'Z'), | |
| ogr.wkbPolyhedralSurface : ('wkbPolyhedralSurface', 'Z'), | |
| ogr.wkbTIN : ('wkbTIN', 'Z') | |
| ###ogr.wkbTriangle : ('wkbTriangle', 'Z') | |
| } | |
| ret = dic[flat_type][0] | |
| if flat_type != type: | |
| if ogr.GT_HasM(type): | |
| if ogr.GT_HasZ(type): | |
| ret += "ZM" | |
| else: | |
| ret += "M" | |
| else: | |
| ret += dic[flat_type][1] | |
| return ret | |
| ############################################################################# | |
| def Esc(x): | |
| return gdal.EscapeString( x, gdal.CPLES_XML ) | |
| ############################################################################# | |
| def Usage(): | |
| print('Usage: ogr2vrt.py [-relative] [-schema] [-feature_count] [-extent]') | |
| print(' in_datasource out_vrtfile [layers]') | |
| print('') | |
| sys.exit(1) | |
| ############################################################################# | |
| # Argument processing. | |
| infile = None | |
| outfile = None | |
| layer_list = [] | |
| relative = "0" | |
| schema=0 | |
| feature_count=0 | |
| extent=0 | |
| openoptions = [] | |
| argv = gdal.GeneralCmdLineProcessor( sys.argv ) | |
| if argv is None: | |
| sys.exit( 0 ) | |
| i = 1 | |
| while i < len(argv): | |
| arg = argv[i] | |
| if arg == '-relative': | |
| relative = "1" | |
| elif arg == '-schema': | |
| schema = 1 | |
| elif arg == '-feature_count': | |
| feature_count = 1 | |
| elif arg == '-extent': | |
| extent = 1 | |
| elif arg == '-oo': | |
| i += 1 | |
| openoptions.append(argv[i]) | |
| elif arg[0] == '-': | |
| Usage() | |
| elif infile is None: | |
| infile = arg | |
| elif outfile is None: | |
| outfile = arg | |
| else: | |
| layer_list.append( arg ) | |
| i = i + 1 | |
| if outfile is None: | |
| Usage() | |
| if schema and feature_count: | |
| sys.stderr.write('Ignoring -feature_count when used with -schema.\n') | |
| feature_count = 0 | |
| if schema and extent: | |
| sys.stderr.write('Ignoring -extent when used with -schema.\n') | |
| extent = 0 | |
| ############################################################################# | |
| # Open the datasource to read. | |
| src_ds = gdal.OpenEx( infile, gdal.OF_VECTOR, open_options = openoptions ) | |
| if schema: | |
| infile = '@dummy@' | |
| if len(layer_list) == 0: | |
| for lyr_idx in range(src_ds.GetLayerCount()): | |
| layer_list.append( src_ds.GetLayer(lyr_idx).GetLayerDefn().GetName() ) | |
| ############################################################################# | |
| # Start the VRT file. | |
| vrt = '<OGRVRTDataSource>\n' | |
| ############################################################################# | |
| # Metadata | |
| mdd_list = src_ds.GetMetadataDomainList() | |
| if mdd_list is not None: | |
| for domain in mdd_list: | |
| if domain == '': | |
| vrt += ' <Metadata>\n' | |
| elif len(domain) > 4 and domain[0:4] == 'xml:': | |
| vrt += ' <Metadata domain="%s" format="xml">\n' % Esc(domain) | |
| else: | |
| vrt += ' <Metadata domain="%s">\n' % Esc(domain) | |
| if len(domain) > 4 and domain[0:4] == 'xml:': | |
| vrt += src_ds.GetMetadata_List(domain)[0] | |
| else: | |
| md = src_ds.GetMetadata(domain) | |
| for key in md: | |
| vrt += ' <MDI key="%s">%s</MDI>\n' % (Esc(key), Esc(md[key])) | |
| vrt += ' </Metadata>\n' | |
| ############################################################################# | |
| # Process each source layer. | |
| for name in layer_list: | |
| layer = src_ds.GetLayerByName(name) | |
| layerdef = layer.GetLayerDefn() | |
| vrt += ' <OGRVRTLayer name="%s">\n' % Esc(name) | |
| mdd_list = layer.GetMetadataDomainList() | |
| if mdd_list is not None: | |
| for domain in mdd_list: | |
| if domain == '': | |
| vrt += ' <Metadata>\n' | |
| elif len(domain) > 4 and domain[0:4] == 'xml:': | |
| vrt += ' <Metadata domain="%s" format="xml">\n' % Esc(domain) | |
| else: | |
| vrt += ' <Metadata domain="%s">\n' % Esc(domain) | |
| if len(domain) > 4 and domain[0:4] == 'xml:': | |
| vrt += layer.GetMetadata_List(domain)[0] | |
| else: | |
| md = layer.GetMetadata(domain) | |
| for key in md: | |
| vrt += ' <MDI key="%s">%s</MDI>\n' % (Esc(key), Esc(md[key])) | |
| vrt += ' </Metadata>\n' | |
| vrt += ' <SrcDataSource relativeToVRT="%s" shared="%d">%s</SrcDataSource>\n' \ | |
| % (relative,not schema,Esc(infile)) | |
| if len(openoptions) > 0: | |
| vrt += ' <OpenOptions>\n' | |
| for option in openoptions: | |
| (key, value) = option.split('=') | |
| vrt += ' <OOI key="%s">%s</OOI>\n' % (Esc(key), Esc(value)) | |
| vrt += ' </OpenOptions>\n' | |
| if schema: | |
| vrt += ' <SrcLayer>@dummy@</SrcLayer>\n' | |
| else: | |
| vrt += ' <SrcLayer>%s</SrcLayer>\n' % Esc(name) | |
| # Historic format for mono-geometry layers | |
| if layerdef.GetGeomFieldCount() == 0: | |
| vrt += ' <GeometryType>wkbNone</GeometryType>\n' | |
| elif layerdef.GetGeomFieldCount() == 1 and \ | |
| layerdef.GetGeomFieldDefn(0).IsNullable(): | |
| vrt += ' <GeometryType>%s</GeometryType>\n' \ | |
| % GeomType2Name(layerdef.GetGeomType()) | |
| vrt += ' <LayerSRS>EPSG:27700</LayerSRS>\n' | |
| if extent: | |
| (xmin, xmax, ymin, ymax) = layer.GetExtent() | |
| vrt += ' <ExtentXMin>%.15g</ExtentXMin>\n' % xmin | |
| vrt += ' <ExtentYMin>%.15g</ExtentYMin>\n' % ymin | |
| vrt += ' <ExtentXMax>%.15g</ExtentXMax>\n' % xmax | |
| vrt += ' <ExtentYMax>%.15g</ExtentYMax>\n' % ymax | |
| # New format for multi-geometry field support | |
| else: | |
| for fld_index in range(layerdef.GetGeomFieldCount()): | |
| src_fd = layerdef.GetGeomFieldDefn( fld_index ) | |
| vrt += ' <GeometryField name="%s"' % src_fd.GetName() | |
| if src_fd.IsNullable() == 0: | |
| vrt += ' nullable="false"' | |
| vrt += '>\n' | |
| vrt += ' <GeometryType>%s</GeometryType>\n' \ | |
| % GeomType2Name(src_fd.GetType()) | |
| srs = src_fd.GetSpatialRef() | |
| if srs is not None: | |
| vrt += ' <SRS>%s</SRS>\n' \ | |
| % (Esc(srs.ExportToWkt())) | |
| if extent: | |
| (xmin, xmax, ymin, ymax) = layer.GetExtent(geom_field = fld_index) | |
| vrt += ' <ExtentXMin>%.15g</ExtentXMin>\n' % xmin | |
| vrt += ' <ExtentYMin>%.15g</ExtentYMin>\n' % ymin | |
| vrt += ' <ExtentXMax>%.15g</ExtentXMax>\n' % xmax | |
| vrt += ' <ExtentYMax>%.15g</ExtentYMax>\n' % ymax | |
| vrt += ' </GeometryField>\n' | |
| # Process all the fields. | |
| for fld_index in range(layerdef.GetFieldCount()): | |
| src_fd = layerdef.GetFieldDefn( fld_index ) | |
| if src_fd.GetType() == ogr.OFTInteger: | |
| type = 'Integer' | |
| elif src_fd.GetType() == ogr.OFTInteger64: | |
| type = 'Integer64' | |
| elif src_fd.GetType() == ogr.OFTString: | |
| type = 'String' | |
| elif src_fd.GetType() == ogr.OFTReal: | |
| type = 'Real' | |
| elif src_fd.GetType() == ogr.OFTStringList: | |
| type = 'StringList' | |
| elif src_fd.GetType() == ogr.OFTIntegerList: | |
| type = 'IntegerList' | |
| elif src_fd.GetType() == ogr.OFTInteger64List: | |
| type = 'Integer64List' | |
| elif src_fd.GetType() == ogr.OFTRealList: | |
| type = 'RealList' | |
| elif src_fd.GetType() == ogr.OFTBinary: | |
| type = 'Binary' | |
| elif src_fd.GetType() == ogr.OFTDate: | |
| type = 'Date' | |
| elif src_fd.GetType() == ogr.OFTTime: | |
| type = 'Time' | |
| elif src_fd.GetType() == ogr.OFTDateTime: | |
| type = 'DateTime' | |
| else: | |
| type = 'String' | |
| vrt += ' <Field name="%s" type="%s"' \ | |
| % (Esc(src_fd.GetName()), type) | |
| if src_fd.GetSubType() != ogr.OFSTNone: | |
| vrt += ' subtype="%s"' % ogr.GetFieldSubTypeName(src_fd.GetSubType()) | |
| if not schema: | |
| vrt += ' src="%s"' % Esc(src_fd.GetName()) | |
| if src_fd.GetWidth() > 0: | |
| vrt += ' width="%d"' % src_fd.GetWidth() | |
| if src_fd.GetPrecision() > 0: | |
| vrt += ' precision="%d"' % src_fd.GetPrecision() | |
| if src_fd.IsNullable() == 0: | |
| vrt += ' nullable="false"' | |
| vrt += '/>\n' | |
| if feature_count: | |
| vrt += ' <FeatureCount>%d</FeatureCount>\n' % layer.GetFeatureCount() | |
| vrt += ' </OGRVRTLayer>\n' | |
| vrt += '</OGRVRTDataSource>\n' | |
| ############################################################################# | |
| # Write vrt | |
| open(outfile,'w').write(vrt) |
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Example usage:
ogr2vrt.py -relative [layername].tab [layername].vrt