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117 lines
5.0 KiB
Python
117 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ZonalStatisticsQgis.py
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---------------------
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Date : September 2016
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Copyright : (C) 2016 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__ = 'September 2016'
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__copyright__ = '(C) 2016, 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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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.analysis import QgsZonalStatistics
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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 ParameterRaster
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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 ParameterSelection
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ZonalStatisticsQgis(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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COLUMN_PREFIX = 'COLUMN_PREFIX'
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STATISTICS = 'STATS'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'zonalstats.png'))
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def defineCharacteristics(self):
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self.STATS = {self.tr('Count'): QgsZonalStatistics.Count,
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self.tr('Sum'): QgsZonalStatistics.Sum,
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self.tr('Mean'): QgsZonalStatistics.Mean,
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self.tr('Median'): QgsZonalStatistics.Median,
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self.tr('Std. dev.'): QgsZonalStatistics.StDev,
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self.tr('Min'): QgsZonalStatistics.Min,
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self.tr('Max'): QgsZonalStatistics.Max,
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self.tr('Range'): QgsZonalStatistics.Range,
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self.tr('Minority'): QgsZonalStatistics.Minority,
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self.tr('Majority'): QgsZonalStatistics.Majority,
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self.tr('Variety'): QgsZonalStatistics.Variety,
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self.tr('All'): QgsZonalStatistics.All
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}
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self.name, self.i18n_name = self.trAlgorithm('Zonal Statistics (QGIS)')
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self.group, self.i18n_group = self.trAlgorithm('Raster tools')
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self.addParameter(ParameterRaster(self.INPUT_RASTER,
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self.tr('Raster layer')))
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self.addParameter(ParameterNumber(self.RASTER_BAND,
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self.tr('Raster band'),
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1, 999, 1))
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self.addParameter(ParameterVector(self.INPUT_VECTOR,
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self.tr('Vector layer containing zones'),
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[dataobjects.TYPE_VECTOR_POLYGON]))
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self.addParameter(ParameterString(self.COLUMN_PREFIX,
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self.tr('Output column prefix'), '_'))
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self.addParameter(ParameterSelection(self.STATISTICS,
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self.tr('Statistics to calculate'),
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list(self.STATS.keys()),
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multiple=True))
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self.addOutput(OutputVector(self.OUTPUT_LAYER,
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self.tr('Zonal statistics'),
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True,
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datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, progress):
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rasterPath = self.getParameterValue(self.INPUT_RASTER)
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vectorPath = self.getParameterValue(self.INPUT_VECTOR)
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bandNumber = self.getParameterValue(self.RASTER_BAND)
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columnPrefix = self.getParameterValue(self.COLUMN_PREFIX)
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st = self.getParameterValue(self.STATISTICS)
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vectorLayer = dataobjects.getObjectFromUri(vectorPath)
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keys = list(self.STATS.keys())
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selectedStats = 0
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for i in st:
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selectedStats |= self.STATS[keys[i]]
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zs = QgsZonalStatistics(vectorLayer,
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rasterPath,
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columnPrefix,
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bandNumber,
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selectedStats)
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zs.calculateStatistics(None)
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self.setOutputValue(self.OUTPUT_LAYER, vectorPath)
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