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89 lines
3.3 KiB
Python
89 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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CreateConstantRaster.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 osgeo import gdal
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from qgis.core import (QgsProcessingParameterRasterLayer,
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QgsProcessingParameterNumber,
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QgsProcessingParameterRasterDestination)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.tools.raster import RasterWriter
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class CreateConstantRaster(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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NUMBER = 'NUMBER'
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def group(self):
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return self.tr('Raster tools')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT,
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self.tr('Reference layer')))
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self.addParameter(QgsProcessingParameterNumber(self.NUMBER,
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self.tr('Constant value'), QgsProcessingParameterNumber.Double,
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defaultValue=1))
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self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr('Constant')))
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def name(self):
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return 'createconstantrasterlayer'
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def displayName(self):
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return self.tr('Create constant raster layer')
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def processAlgorithm(self, parameters, context, feedback):
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layer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
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value = self.parameterAsDouble(parameters, self.NUMBER, context)
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outputFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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raster = gdal.Open(layer.source(), gdal.GA_ReadOnly)
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geoTransform = raster.GetGeoTransform()
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cellsize = (layer.extent().xMaximum() - layer.extent().xMinimum()) \
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/ layer.width()
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w = RasterWriter(outputFile,
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layer.extent().xMinimum(),
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layer.extent().yMinimum(),
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layer.extent().xMaximum(),
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layer.extent().yMaximum(),
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cellsize,
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1,
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layer.crs(),
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geoTransform
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)
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w.matrix.fill(value)
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w.close()
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return {self.OUTPUT: outputFile}
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