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# -*- coding: utf-8 -*-
"""
***************************************************************************
ClipByExtent.py
---------------------
Date : September 2013
Copyright : (C) 2013 by Alexander Bruy
Email : alexander 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__ = 'September 2013'
__copyright__ = '(C) 2013, Alexander Bruy'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
from PyQt4 import QtGui
from qgis.core import *
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterExtent import ParameterExtent
from processing.parameters.ParameterString import ParameterString
from processing.outputs.OutputRaster import OutputRaster
from processing.algs.gdal.GdalUtils import GdalUtils
class ClipByExtent(GdalAlgorithm):
INPUT = 'INPUT'
OUTPUT = 'OUTPUT'
NO_DATA = 'NO_DATA'
PROJWIN = 'PROJWIN'
EXTRA = 'EXTRA'
def defineCharacteristics(self):
self.name = 'Clip raster by extent'
self.group = '[GDAL] Extraction'
self.addParameter(ParameterRaster(self.INPUT, 'Input layer', False))
self.addParameter(ParameterString(self.NO_DATA,
'Nodata value, leave as none to take the nodata value from input',
'none'))
self.addParameter(ParameterExtent(self.PROJWIN, 'Clipping extent'))
self.addParameter(ParameterString(self.EXTRA,
'Additional creation parameters', '', optional=True))
self.addOutput(OutputRaster(self.OUTPUT, 'Output layer'))
def processAlgorithm(self, progress):
out = self.getOutputValue(self.OUTPUT)
noData = str(self.getParameterValue(self.NO_DATA))
projwin = str(self.getParameterValue(self.PROJWIN))
extra = str(self.getParameterValue(self.EXTRA))
arguments = []
arguments.append('-of')
arguments.append(GdalUtils.getFormatShortNameFromFilename(out))
arguments.append('-a_nodata')
arguments.append(noData)
regionCoords = projwin.split(',')
arguments.append('-projwin')
arguments.append(regionCoords[0])
arguments.append(regionCoords[3])
arguments.append(regionCoords[1])
arguments.append(regionCoords[2])
if len(extra) > 0:
arguments.append(extra)
arguments.append(self.getParameterValue(self.INPUT))
arguments.append(out)
GdalUtils.runGdal(['gdal_translate',
GdalUtils.escapeAndJoin(arguments)], progress)
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