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596b56c441
- Avoid use of seperate feature requests for every point - Use GEOS prepared geometries when testing for point containment Quick stats: ~1500 point layer BEFORE: 17 seconds AFTER: 3 seconds ~900k point layer BEFORE: 30 mins = canceled at 20% AFTER: 2.5 mins = 100% complete
127 lines
5.2 KiB
Python
127 lines
5.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsInPolygon.py
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---------------------
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Date : August 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__ = 'August 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 PyQt4.QtCore import QVariant
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from qgis.core import QgsField, QgsFeatureRequest, QgsFeature, QgsGeometry
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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 ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class PointsInPolygonWeighted(GeoAlgorithm):
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POLYGONS = 'POLYGONS'
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POINTS = 'POINTS'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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WEIGHT = 'WEIGHT'
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# =========================================================================
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# def getIcon(self):
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# return QIcon(os.path.dirname(__file__) + "/icons/sum_points.png")
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# =========================================================================
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Count points in polygon(weighted)')
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self.group, self.i18n_group = self.trAlgorithm('Vector analysis tools')
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self.addParameter(ParameterVector(self.POLYGONS,
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self.tr('Polygons'), [ParameterVector.VECTOR_TYPE_POLYGON]))
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self.addParameter(ParameterVector(self.POINTS,
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self.tr('Points'), [ParameterVector.VECTOR_TYPE_POINT]))
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self.addParameter(ParameterTableField(self.WEIGHT,
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self.tr('Weight field'), self.POINTS))
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self.addParameter(ParameterString(self.FIELD,
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self.tr('Count field name'), 'NUMPOINTS'))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Weighted count')))
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def processAlgorithm(self, progress):
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polyLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POLYGONS))
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pointLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POINTS))
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fieldName = self.getParameterValue(self.FIELD)
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fieldIdx = pointLayer.fieldNameIndex(self.getParameterValue(self.WEIGHT))
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polyProvider = polyLayer.dataProvider()
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fields = polyProvider.fields()
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fields.append(QgsField(fieldName, QVariant.Int))
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(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
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polyLayer.pendingFields(), fieldName)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields.toList(), polyProvider.geometryType(), polyProvider.crs())
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spatialIndex = vector.spatialindex(pointLayer)
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ftPoint = QgsFeature()
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outFeat = QgsFeature()
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geom = QgsGeometry()
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current = 0
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features = vector.features(polyLayer)
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total = 100.0 / float(len(features))
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for ftPoly in features:
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geom = ftPoly.geometry()
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engine = QgsGeometry.createGeometryEngine(geom.geometry())
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engine.prepareGeometry()
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attrs = ftPoly.attributes()
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count = 0
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points = spatialIndex.intersects(geom.boundingBox())
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if len(points) > 0:
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progress.setText(unicode(len(points)))
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request = QgsFeatureRequest().setFilterFids(points)
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fit = pointLayer.getFeatures(request)
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ftPoint = QgsFeature()
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while fit.nextFeature(ftPoint):
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tmpGeom = QgsGeometry(ftPoint.geometry())
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if engine.contains(tmpGeom.geometry()):
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weight = unicode(ftPoint.attributes()[fieldIdx])
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try:
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count += float(weight)
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except:
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# Ignore fields with non-numeric values
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pass
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outFeat.setGeometry(geom)
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if idxCount == len(attrs):
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attrs.append(count)
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else:
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attrs[idxCount] = count
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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