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

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alexbruy committed Oct 13, 2013
1 parent 10506c5 commit ef2963c8b42bec643574660d5bc583d544486ff5
@@ -54,6 +54,7 @@
from processing.gdal.fillnodata import fillnodata
from processing.gdal.extractprojection import ExtractProjection
from processing.gdal.gdal2xyz import gdal2xyz
from processing.gdal.hillshade import hillshade

from processing.gdal.ogr2ogr import Ogr2Ogr
from processing.gdal.ogrinfo import OgrInfo
@@ -105,6 +106,7 @@ def createAlgsList(self):
rgb2pct(), pct2rgb(), merge(), polygonize(), gdaladdo(),
ClipByExtent(), ClipByMask(), contour(), rasterize(), proximity(),
sieve(), fillnodata(), ExtractProjection(), gdal2xyz(),
hillshade(),
# ----- OGR tools -----
OgrInfo(), Ogr2Ogr(), OgrSql(),
]
@@ -0,0 +1,103 @@
# -*- 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'

# 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 hillshade(GeoAlgorithm):

INPUT = 'INPUT'
BAND = 'BAND'
COMPUTE_EDGES = 'COMPUTE_EDGES'
ZEVENBERGEN = 'ZEVENBERGEN'
Z_FACTOR = 'Z_FACTOR'
SCALE = 'SCALE'
AZIMUTH = 'AZIMUTH'
ALTITUDE = 'ALTITUDE'
OUTPUT = 'OUTPUT'

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

def defineCharacteristics(self):
self.name = 'Hillshade'
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(ParameterNumber(self.Z_FACTOR,
'Z factor (vertical exaggeration)', 0.0,
99999999.999999, 1.0))
self.addParameter(ParameterNumber(self.SCALE,
'Scale (ratio of vert. units to horiz.)', 0.0,
99999999.999999, 1.0))
self.addParameter(ParameterNumber(self.AZIMUTH,
'Azimuth of the light', 0.0, 359.0, 315.0))
self.addParameter(ParameterNumber(self.ALTITUDE,
'Altitude of the light', 0.0, 99999999.999999, 45.0))

self.addOutput(OutputRaster(self.OUTPUT, 'Output file'))

def processAlgorithm(self, progress):
arguments = ['hillshade']
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('-z')
arguments.append(str(self.getParameterValue(self.Z_FACTOR)))
arguments.append('-s')
arguments.append(str(self.getParameterValue(self.SCALE)))
arguments.append('-az')
arguments.append(str(self.getParameterValue(self.AZIMUTH)))
arguments.append('-alt')
arguments.append(str(self.getParameterValue(self.ALTITUDE)))

if self.getParameterValue(self.COMPUTE_EDGES):
arguments.append('-compute_edges')

if self.getParameterValue(self.ZEVENBERGEN):
arguments.append('-alg')
arguments.append('ZevenbergenThorne')

GdalUtils.runGdal(['gdaldem',
GdalUtils.escapeAndJoin(arguments)], progress)

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