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85 lines
3.1 KiB
Python
85 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Slope.py
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---------------------
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Date : October 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__ = 'October 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 QgsSlopeFilter
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from qgis.core import (QgsRasterFileWriter,
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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.dataobjects import exportRasterLayer
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Slope(QgisAlgorithm):
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INPUT = 'INPUT'
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Z_FACTOR = 'Z_FACTOR'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'dem.png'))
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def group(self):
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return self.tr('Raster terrain analysis')
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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('Elevation layer')))
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self.addParameter(QgsProcessingParameterNumber(self.Z_FACTOR,
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self.tr('Z factor'), QgsProcessingParameterNumber.Double,
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1, False, 0.00, 999999.99))
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self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr('Slope')))
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def name(self):
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return 'slope'
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def displayName(self):
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return self.tr('Slope')
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def processAlgorithm(self, parameters, context, feedback):
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inputFile = exportRasterLayer(self.parameterAsRasterLayer(parameters, self.INPUT, context))
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zFactor = self.parameterAsDouble(parameters, self.Z_FACTOR, context)
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outputFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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outputFormat = QgsRasterFileWriter.driverForExtension(os.path.splitext(outputFile)[1])
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slope = QgsSlopeFilter(inputFile, outputFile, outputFormat)
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slope.setZFactor(zFactor)
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slope.processRaster(feedback)
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return {self.OUTPUT: outputFile}
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