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158 lines
6.0 KiB
Python
158 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ogrinfo.py
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---------------------
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Date : November 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__ = 'November 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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from sextante.outputs.OutputHTML import OutputHTML
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from sextante.parameters.ParameterVector import ParameterVector
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from qgis.core import *
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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import string
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import re
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import ogr
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from sextante.gdal.OgrAlgorithm import OgrAlgorithm
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class OgrInfo(OgrAlgorithm):
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#constants used to refer to parameters and outputs.
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#They will be used when calling the algorithm from another algorithm,
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#or when calling SEXTANTE from the QGIS console.
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OUTPUT = "OUTPUT"
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INPUT_LAYER = "INPUT_LAYER"
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def defineCharacteristics(self):
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self.name = "ogrinfo"
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self.group = "[OGR] Miscellaneous"
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self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_ANY, False))
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self.addOutput(OutputHTML(self.OUTPUT, "Layer information"))
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def processAlgorithm(self, progress):
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input = self.getParameterValue(self.INPUT_LAYER)
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ogrLayer = self.ogrConnectionString(input)
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output = self.getOutputValue(self.OUTPUT)
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self.ogrinfo( ogrLayer )
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f = open(output, "w")
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f.write("<pre>" + self.info + "</pre>")
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f.close()
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def out(self, text):
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self.info = self.info + text + '\n'
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def ogrinfo(self, pszDataSource):
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bVerbose = True
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bSummaryOnly = True
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self.info = ''
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qDebug("Opening data source '%s'" % pszDataSource)
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poDS = ogr.Open( pszDataSource, False )
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if poDS is None:
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self.info = self.failure(pszDataSource)
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return
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poDriver = poDS.GetDriver()
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if bVerbose:
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self.out( "INFO: Open of `%s'\n"
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" using driver `%s' successful." % (pszDataSource, poDriver.GetName()) )
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poDS_Name = poDS.GetName()
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if str(type(pszDataSource)) == "<type 'unicode'>" and str(type(poDS_Name)) == "<type 'str'>":
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poDS_Name = unicode(poDS_Name, "utf8")
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if bVerbose and pszDataSource != poDS_Name:
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self.out( "INFO: Internal data source name `%s'\n"
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" different from user name `%s'." % (poDS_Name, pszDataSource ))
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#/* -------------------------------------------------------------------- */
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#/* Process each data source layer. */
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#/* -------------------------------------------------------------------- */
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for iLayer in range(poDS.GetLayerCount()):
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poLayer = poDS.GetLayer(iLayer)
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if poLayer is None:
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self.out( "FAILURE: Couldn't fetch advertised layer %d!" % iLayer )
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return 1
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self.ReportOnLayer( poLayer )
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def ReportOnLayer( self, poLayer, pszWHERE=None, poSpatialFilter=None ):
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bVerbose = True
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poDefn = poLayer.GetLayerDefn()
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#/* -------------------------------------------------------------------- */
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#/* Set filters if provided. */
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#/* -------------------------------------------------------------------- */
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if pszWHERE is not None:
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if poLayer.SetAttributeFilter( pszWHERE ) != 0:
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self.out("FAILURE: SetAttributeFilter(%s) failed." % pszWHERE)
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return
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if poSpatialFilter is not None:
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poLayer.SetSpatialFilter( poSpatialFilter )
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#/* -------------------------------------------------------------------- */
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#/* Report various overall information. */
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#/* -------------------------------------------------------------------- */
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self.out( "" )
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self.out( "Layer name: %s" % poDefn.GetName() )
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if bVerbose:
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self.out( "Geometry: %s" % ogr.GeometryTypeToName( poDefn.GetGeomType() ) )
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self.out( "Feature Count: %d" % poLayer.GetFeatureCount() )
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oExt = poLayer.GetExtent(True, can_return_null = True)
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if oExt is not None:
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self.out("Extent: (%f, %f) - (%f, %f)" % (oExt[0], oExt[1], oExt[2], oExt[3]))
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if poLayer.GetSpatialRef() is None:
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pszWKT = "(unknown)"
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else:
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pszWKT = poLayer.GetSpatialRef().ExportToPrettyWkt()
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self.out( "Layer SRS WKT:\n%s" % pszWKT )
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if len(poLayer.GetFIDColumn()) > 0:
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self.out( "FID Column = %s" % poLayer.GetFIDColumn() )
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if len(poLayer.GetGeometryColumn()) > 0:
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self.out( "Geometry Column = %s" % poLayer.GetGeometryColumn() )
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for iAttr in range(poDefn.GetFieldCount()):
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poField = poDefn.GetFieldDefn( iAttr )
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self.out( "%s: %s (%d.%d)" % ( \
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poField.GetNameRef(), \
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poField.GetFieldTypeName( poField.GetType() ), \
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poField.GetWidth(), \
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poField.GetPrecision() ))
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