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# -*- coding: utf-8 -*-
"""
***************************************************************************
slope.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'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterBoolean import ParameterBoolean
from processing.parameters.ParameterNumber import ParameterNumber
from processing.outputs.OutputRaster import OutputRaster
from processing.algs.gdal.GdalUtils import GdalUtils
from processing.tools.system import *
class slope(GdalAlgorithm):
INPUT = 'INPUT'
BAND = 'BAND'
COMPUTE_EDGES = 'COMPUTE_EDGES'
ZEVENBERGEN = 'ZEVENBERGEN'
AS_PERCENT = 'AS_PERCENT'
SCALE = 'SCALE'
OUTPUT = 'OUTPUT'
def defineCharacteristics(self):
self.name = 'Slope'
self.group = '[GDAL] Analysis'
self.addParameter(ParameterRaster(self.INPUT, 'Input layer'))
self.addParameter(ParameterNumber(self.BAND, 'Band number', 1, 99, 1))
self.addParameter(ParameterBoolean(self.COMPUTE_EDGES, 'Compute edges',
False))
self.addParameter(ParameterBoolean(self.ZEVENBERGEN,
"Use Zevenbergen&Thorne formula (instead of the Horn's one)",
False))
self.addParameter(ParameterBoolean(self.AS_PERCENT,
'Slope expressed as percent (instead of degrees)',
False))
self.addParameter(ParameterNumber(self.SCALE,
'Scale (ratio of vert. units to horiz.)', 0.0,
99999999.999999, 1.0))
self.addOutput(OutputRaster(self.OUTPUT, 'Output file'))
def processAlgorithm(self, progress):
arguments = ['slope']
arguments.append(unicode(self.getParameterValue(self.INPUT)))
arguments.append(unicode(self.getOutputValue(self.OUTPUT)))
arguments.append('-b')
arguments.append(str(self.getParameterValue(self.BAND)))
arguments.append('-s')
arguments.append(str(self.getParameterValue(self.SCALE)))
if self.getParameterValue(self.COMPUTE_EDGES):
arguments.append('-compute_edges')
if self.getParameterValue(self.ZEVENBERGEN):
arguments.append('-alg')
arguments.append('ZevenbergenThorne')
if self.getParameterValue(self.AS_PERCENT):
arguments.append('-p')
GdalUtils.runGdal(['gdaldem',
GdalUtils.escapeAndJoin(arguments)], progress)
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