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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
124 lines
5.2 KiB
Python
124 lines
5.2 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 icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'zonalstats.png'))
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def group(self):
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return self.tr('Raster tools')
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def name(self):
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return 'zonalstatisticsqgis'
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def displayName(self):
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return self.tr('Zonal Statistics (QGIS)')
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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.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, context, feedback):
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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.QgsProcessingUtils.mapLayerFromString(vectorPath, context)
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rasterLayer = dataobjects.QgsProcessingUtils.mapLayerFromString(rasterPath, context)
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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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rasterLayer,
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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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