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hillshade.py
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hillshade.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
hillshade.py
---------------------
Date : October 2013
Copyright : (C) 2013 by Alexander Bruy
Email : alexander dot bruy at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Alexander Bruy'
__date__ = 'October 2013'
__copyright__ = '(C) 2013, Alexander Bruy'
import os
from qgis.core import (QgsRasterFileWriter,
QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBand,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterRasterDestination)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class hillshade(GdalAlgorithm):
INPUT = 'INPUT'
BAND = 'BAND'
COMPUTE_EDGES = 'COMPUTE_EDGES'
ZEVENBERGEN = 'ZEVENBERGEN'
Z_FACTOR = 'Z_FACTOR'
SCALE = 'SCALE'
AZIMUTH = 'AZIMUTH'
ALTITUDE = 'ALTITUDE'
COMBINED = 'COMBINED'
MULTIDIRECTIONAL = 'MULTIDIRECTIONAL'
OPTIONS = 'OPTIONS'
EXTRA = 'EXTRA'
OUTPUT = 'OUTPUT'
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT, self.tr('Input layer')))
self.addParameter(QgsProcessingParameterBand(self.BAND,
self.tr('Band number'),
1,
parentLayerParameterName=self.INPUT))
self.addParameter(QgsProcessingParameterNumber(self.Z_FACTOR,
self.tr('Z factor (vertical exaggeration)'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0,
defaultValue=1.0))
self.addParameter(QgsProcessingParameterNumber(self.SCALE,
self.tr('Scale (ratio of vertical units to horizontal)'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0,
defaultValue=1.0))
self.addParameter(QgsProcessingParameterNumber(self.AZIMUTH,
self.tr('Azimuth of the light'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0,
maxValue=360,
defaultValue=315.0))
self.addParameter(QgsProcessingParameterNumber(self.ALTITUDE,
self.tr('Altitude of the light'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0,
defaultValue=45.0))
self.addParameter(QgsProcessingParameterBoolean(self.COMPUTE_EDGES,
self.tr('Compute edges'),
defaultValue=False))
self.addParameter(QgsProcessingParameterBoolean(self.ZEVENBERGEN,
self.tr("Use Zevenbergen&Thorne formula instead of the Horn's one"),
defaultValue=False))
self.addParameter(QgsProcessingParameterBoolean(self.COMBINED,
self.tr("Combined shading"),
defaultValue=False))
self.addParameter(QgsProcessingParameterBoolean(self.MULTIDIRECTIONAL,
self.tr("Multidirectional shading"),
defaultValue=False))
options_param = QgsProcessingParameterString(self.OPTIONS,
self.tr('Additional creation options'),
defaultValue='',
optional=True)
options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
options_param.setMetadata({
'widget_wrapper': {
'class': 'processing.algs.gdal.ui.RasterOptionsWidget.RasterOptionsWidgetWrapper'}})
self.addParameter(options_param)
extra_param = QgsProcessingParameterString(self.EXTRA,
self.tr('Additional command-line parameters'),
defaultValue=None,
optional=True)
extra_param.setFlags(extra_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(extra_param)
self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr('Hillshade')))
def name(self):
return 'hillshade'
def displayName(self):
return self.tr('Hillshade')
def group(self):
return self.tr('Raster analysis')
def groupId(self):
return 'rasteranalysis'
def commandName(self):
return 'gdaldem'
def getConsoleCommands(self, parameters, context, feedback, executing=True):
arguments = ['hillshade']
inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if inLayer is None:
raise QgsProcessingException(self.invalidRasterError(parameters, self.INPUT))
arguments.append(inLayer.source())
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, out)
arguments.append(out)
arguments.append('-of')
arguments.append(QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]))
arguments.append('-b')
arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
arguments.append('-z')
arguments.append(str(self.parameterAsDouble(parameters, self.Z_FACTOR, context)))
arguments.append('-s')
arguments.append(str(self.parameterAsDouble(parameters, self.SCALE, context)))
multidirectional = self.parameterAsBoolean(parameters, self.MULTIDIRECTIONAL, context)
# azimuth and multidirectional are mutually exclusive
if not multidirectional:
arguments.append('-az')
arguments.append(str(self.parameterAsDouble(parameters, self.AZIMUTH, context)))
arguments.append('-alt')
arguments.append(str(self.parameterAsDouble(parameters, self.ALTITUDE, context)))
if self.parameterAsBoolean(parameters, self.COMPUTE_EDGES, context):
arguments.append('-compute_edges')
if self.parameterAsBoolean(parameters, self.ZEVENBERGEN, context):
arguments.append('-alg')
arguments.append('ZevenbergenThorne')
combined = self.parameterAsBoolean(parameters, self.COMBINED, context)
if combined and not multidirectional:
arguments.append('-combined')
elif multidirectional and not combined:
arguments.append('-multidirectional')
elif multidirectional and combined:
raise QgsProcessingException(self.tr('Options -multirectional and -combined are mutually exclusive.'))
options = self.parameterAsString(parameters, self.OPTIONS, context)
if options:
arguments.extend(GdalUtils.parseCreationOptions(options))
if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ''):
extra = self.parameterAsString(parameters, self.EXTRA, context)
arguments.append(extra)
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]