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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.
161 lines
6.3 KiB
Python
161 lines
6.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ClipByMask.py
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---------------------
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Date : September 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander 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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from builtins import str
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__author__ = 'Alexander Bruy'
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__date__ = 'September 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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import os
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from qgis.PyQt.QtGui import QIcon
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from osgeo import gdal
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from processing.core.parameters import (ParameterRaster,
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ParameterVector,
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ParameterBoolean,
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ParameterString,
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ParameterSelection)
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from processing.core.outputs import OutputRaster
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.algs.gdal.GdalUtils import GdalUtils
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from processing.tools import dataobjects
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from processing.tools.vector import ogrConnectionString
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ClipByMask(GdalAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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NO_DATA = 'NO_DATA'
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MASK = 'MASK'
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ALPHA_BAND = 'ALPHA_BAND'
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CROP_TO_CUTLINE = 'CROP_TO_CUTLINE'
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KEEP_RESOLUTION = 'KEEP_RESOLUTION'
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OPTIONS = 'OPTIONS'
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RTYPE = 'RTYPE'
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TYPE = ['Byte', 'Int16', 'UInt16', 'UInt32', 'Int32', 'Float32', 'Float64']
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def name(self):
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return 'cliprasterbymasklayer'
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def displayName(self):
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return self.tr('Clip raster by mask layer')
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'gdaltools', 'raster-clip.png'))
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def group(self):
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return self.tr('Raster extraction')
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def defineCharacteristics(self):
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self.addParameter(ParameterRaster(self.INPUT, self.tr('Input layer'), False))
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self.addParameter(ParameterVector(self.MASK, self.tr('Mask layer'),
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[dataobjects.TYPE_VECTOR_POLYGON]))
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self.addParameter(ParameterString(self.NO_DATA,
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self.tr("Nodata value, leave blank to take the nodata value from input"),
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'', optional=True))
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self.addParameter(ParameterBoolean(self.ALPHA_BAND,
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self.tr('Create and output alpha band'),
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False))
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self.addParameter(ParameterBoolean(self.CROP_TO_CUTLINE,
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self.tr('Crop the extent of the target dataset to the extent of the cutline'),
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True))
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self.addParameter(ParameterBoolean(self.KEEP_RESOLUTION,
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self.tr('Keep resolution of output raster'),
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False))
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self.addParameter(ParameterString(self.OPTIONS,
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self.tr('Additional creation options'),
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optional=True,
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metadata={'widget_wrapper': 'processing.algs.gdal.ui.RasterOptionsWidget.RasterOptionsWidgetWrapper'}))
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self.addParameter(ParameterSelection(self.RTYPE,
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self.tr('Output raster type'),
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self.TYPE, 5))
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self.addOutput(OutputRaster(self.OUTPUT, self.tr('Clipped (mask)')))
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def getConsoleCommands(self):
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out = self.getOutputValue(self.OUTPUT)
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mask = self.getParameterValue(self.MASK)
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context = dataobjects.createContext()
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maskLayer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.MASK), context)
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ogrMask = ogrConnectionString(mask)[1:-1]
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noData = self.getParameterValue(self.NO_DATA)
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opts = self.getParameterValue(self.OPTIONS)
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if noData is not None:
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noData = str(noData)
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addAlphaBand = self.getParameterValue(self.ALPHA_BAND)
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cropToCutline = self.getParameterValue(self.CROP_TO_CUTLINE)
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keepResolution = self.getParameterValue(self.KEEP_RESOLUTION)
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arguments = []
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arguments.append('-ot')
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arguments.append(self.TYPE[self.getParameterValue(self.RTYPE)])
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arguments.append('-q')
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arguments.append('-of')
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arguments.append(GdalUtils.getFormatShortNameFromFilename(out))
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if noData and len(noData) > 0:
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arguments.append('-dstnodata')
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arguments.append(noData)
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if keepResolution:
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r = gdal.Open(self.getParameterValue(self.INPUT))
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geoTransform = r.GetGeoTransform()
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r = None
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arguments.append('-tr')
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arguments.append(str(geoTransform[1]))
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arguments.append(str(geoTransform[5]))
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arguments.append('-tap')
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arguments.append('-cutline')
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arguments.append(ogrMask)
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if maskLayer and maskLayer.subsetString() != '':
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arguments.append('-cwhere')
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arguments.append(maskLayer.subsetString())
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if cropToCutline:
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arguments.append('-crop_to_cutline')
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if addAlphaBand:
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arguments.append('-dstalpha')
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if opts:
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arguments.append('-co')
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arguments.append(opts)
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if GdalUtils.version() in [2010000, 2010100]:
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arguments.append("--config GDALWARP_IGNORE_BAD_CUTLINE YES")
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arguments.append(self.getParameterValue(self.INPUT))
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arguments.append(out)
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return ['gdalwarp', GdalUtils.escapeAndJoin(arguments)]
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