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[processing] add gdal slope algorithm (addresses #7201)

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alexbruy committed Oct 13, 2013
1 parent ef2963c commit e6ba40585cdeb8985433dcf521c0e9c6eb55a3b1
@@ -55,6 +55,7 @@
from processing.gdal.extractprojection import ExtractProjection
from processing.gdal.gdal2xyz import gdal2xyz
from processing.gdal.hillshade import hillshade
from processing.gdal.slope import slope

from processing.gdal.ogr2ogr import Ogr2Ogr
from processing.gdal.ogrinfo import OgrInfo
@@ -106,7 +107,7 @@ def createAlgsList(self):
rgb2pct(), pct2rgb(), merge(), polygonize(), gdaladdo(),
ClipByExtent(), ClipByMask(), contour(), rasterize(), proximity(),
sieve(), fillnodata(), ExtractProjection(), gdal2xyz(),
hillshade(),
hillshade(), slope(),
# ----- OGR tools -----
OgrInfo(), Ogr2Ogr(), OgrSql(),
]
@@ -0,0 +1,94 @@
# -*- 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 PyQt4.QtGui import *

from processing.core.GeoAlgorithm import GeoAlgorithm
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.gdal.GdalUtils import GdalUtils
from processing.tools.system import *


class slope(GeoAlgorithm):

INPUT = 'INPUT'
BAND = 'BAND'
COMPUTE_EDGES = 'COMPUTE_EDGES'
ZEVENBERGEN = 'ZEVENBERGEN'
AS_PERCENT = 'AS_PERCENT'
SCALE = 'SCALE'
OUTPUT = 'OUTPUT'

#def getIcon(self):
# filepath = os.path.dirname(__file__) + '/icons/dem.png'
# return QIcon(filepath)

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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