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"""
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***************************************************************************
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ogr2ogrdistance.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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__revision__ = '$Format:%H$'
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import os
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.core import *
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterString
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterBoolean
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools.system import *
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from processing.tools import dataobjects
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from processing.algs.gdal.OgrAlgorithm import OgrAlgorithm
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from processing.algs.gdal.GdalUtils import GdalUtils
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class Ogr2OgrDistance(OgrAlgorithm):
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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INPUT_LAYER_A = 'INPUT_LAYER_A'
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INPUT_LAYER_B = 'INPUT_LAYER_B'
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FIELD_A = 'FIELD_A'
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FIELD_B = 'FIELD_B'
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TABLE = 'TABLE'
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OPTIONS = 'OPTIONS'
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def defineCharacteristics(self):
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self.name = 'Distance between features'
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self.group = '[OGR] PostGIS Geoprocessing'
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self.addParameter(ParameterVector(self.INPUT_LAYER_A, 'First input layer',
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[ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterTableField(self.FIELD_A, 'First input layer ID',
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self.INPUT_LAYER_A, optional=False))
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self.addParameter(ParameterVector(self.INPUT_LAYER_B, 'Second input layer',
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[ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterTableField(self.FIELD_B, 'Second input layer ID',
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self.INPUT_LAYER_B, optional=False))
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self.addParameter(ParameterString(self.TABLE, 'Table name',
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'distance_analysis', optional=False))
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self.addParameter(ParameterString(self.OPTIONS, 'Additional creation options (see ogr2ogr manual)',
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'', optional=True))
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def processAlgorithm(self, progress):
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inLayerA = self.getParameterValue(self.INPUT_LAYER_A)
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ogrLayerA = self.ogrConnectionString(inLayerA)
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layernameA = self.ogrLayerName(inLayerA)
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inLayerB = self.getParameterValue(self.INPUT_LAYER_B)
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ogrLayerB = self.ogrConnectionString(inLayerB)
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layernameB = self.ogrLayerName(inLayerB)
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fieldA = unicode(self.getParameterValue(self.FIELD_A))
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fieldB = unicode(self.getParameterValue(self.FIELD_B))
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dsUriA = QgsDataSourceURI(self.getParameterValue(self.INPUT_LAYER_A))
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geomColumnA = dsUriA.geometryColumn()
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dsUriB = QgsDataSourceURI(self.getParameterValue(self.INPUT_LAYER_B))
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geomColumnB = dsUriB.geometryColumn()
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table = unicode(self.getParameterValue(self.TABLE))
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sqlstring = "-sql \"SELECT ST_ShortestLine(g1." + geomColumnA + ",g2." + geomColumnB + ") AS geom, ST_Distance(g1." + geomColumnA + ",g2." + geomColumnB + ") AS distance, g1. " + fieldA + " AS id_from, g2. " + fieldB + " AS id_to FROM " + layernameA + " AS g1, " + layernameB + " AS g2\" -nln " + table + " -lco FID=gid -lco GEOMETRY_NAME=geom -nlt LINESTRING --config PG_USE_COPY YES"
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options = unicode(self.getParameterValue(self.OPTIONS))
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arguments = []
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arguments.append('-f')
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arguments.append('PostgreSQL')
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arguments.append(ogrLayerA)
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arguments.append(ogrLayerA)
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arguments.append(sqlstring)
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arguments.append('-overwrite')
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if len(options) > 0:
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arguments.append(options)
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commands = []
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if isWindows():
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commands = ['cmd.exe', '/C ', 'ogr2ogr.exe',
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GdalUtils.escapeAndJoin(arguments)]
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else:
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commands = ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]
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GdalUtils.runGdal(commands, progress)
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