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115 lines
4.1 KiB
Python
115 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsFromPolygons.py
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---------------------
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Date : August 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'August 2013'
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__copyright__ = '(C) 2013, Alexander Bruy'
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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 osgeo import gdal
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from qgis.core import *
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from PyQt4.QtCore import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.parameters.ParameterRaster import ParameterRaster
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from processing.parameters.ParameterVector import ParameterVector
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from processing.outputs.OutputVector import OutputVector
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from processing.tools import dataobjects, vector
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from processing.tools.general import *
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class PointsFromPolygons(GeoAlgorithm):
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INPUT_RASTER = "INPUT_RASTER"
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RASTER_BAND = "RASTER_BAND"
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INPUT_VECTOR = "INPUT_VECTOR"
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OUTPUT_LAYER = "OUTPUT_LAYER"
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def defineCharacteristics(self):
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self.name = "Get raster values at polygon nodes"
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self.group = "Vector analysis tools"
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self.addParameter(ParameterRaster(self.INPUT_RASTER, "Raster layer"))
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self.addParameter(ParameterVector(self.INPUT_VECTOR, "Vector layer", [ParameterVector.VECTOR_TYPE_POLYGON]))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer"))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_VECTOR))
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rasterPath = unicode(self.getParameterValue(self.INPUT_RASTER))
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rasterDS = gdal.Open(rasterPath, gdal.GA_ReadOnly)
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geoTransform = rasterDS.GetGeoTransform()
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rasterDS = None
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fields = QgsFields()
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fields.append(QgsField("id", QVariant.Int, "", 10, 0))
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fields.append(QgsField("poly_id", QVariant.Int, "", 10, 0))
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fields.append(QgsField("point_id", QVariant.Int, "", 10, 0))
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writer = self.getOutputFromName(self.OUTPUT_LAYER).getVectorWriter(fields.toList(), QGis.WKBPoint, layer.crs())
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outFeature = QgsFeature()
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outFeature.setFields(fields)
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point = QgsPoint()
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fid = 0
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polyId = 0
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pointId = 0
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current = 0
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features = vector.features(layer)
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total = 100.0 / len(features)
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for f in features:
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geom = f.geometry()
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bbox = geom.boundingBox()
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xMin = bbox.xMinimum()
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xMax = bbox.xMaximum()
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yMin = bbox.yMinimum()
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yMax = bbox.yMaximum()
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startRow, startColumn = mapToPixel(xMin, yMax, geoTransform)
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endRow, endColumn = mapToPixel(xMax, yMin, geoTransform)
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for row in xrange(startRow, endRow + 1):
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for col in xrange(startColumn, endColumn + 1):
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x, y = pixelToMap(row, col, geoTransform)
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point.setX(x)
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point.setY(y)
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if geom.contains(point):
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outFeature.setGeometry(QgsGeometry.fromPoint(point))
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outFeature["id"] = fid
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outFeature["poly_id"] = polyId
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outFeature["point_id"] = pointId
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fid += 1
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pointId +=1
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writer.addFeature(outFeature)
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pointId = 0
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polyId += 1
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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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