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# -*- coding: utf-8 -*-
"""
***************************************************************************
ClipByMask.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 osgeo import gdal
from qgis.core import *
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterVector import ParameterVector
from processing.parameters.ParameterBoolean import ParameterBoolean
from processing.parameters.ParameterString import ParameterString
from processing.outputs.OutputRaster import OutputRaster
from processing.algs.gdal.GdalUtils import GdalUtils
class ClipByMask(GdalAlgorithm):
INPUT = 'INPUT'
OUTPUT = 'OUTPUT'
NO_DATA = 'NO_DATA'
MASK = 'MASK'
ALPHA_BAND = 'ALPHA_BAND'
KEEP_RESOLUTION = 'KEEP_RESOLUTION'
EXTRA = 'EXTRA'
def defineCharacteristics(self):
self.name = 'Clip raster by mask layer'
self.group = '[GDAL] Extraction'
self.addParameter(ParameterRaster(self.INPUT, 'Input layer', False))
self.addParameter(ParameterVector(self.MASK, 'Mask layer',
[ParameterVector.VECTOR_TYPE_POLYGON]))
self.addParameter(ParameterString(self.NO_DATA,
'Nodata value, leave as none to take the nodata value from input',
'none'))
self.addParameter(ParameterBoolean(self.ALPHA_BAND,
'Create and output alpha band', False))
self.addParameter(ParameterBoolean(self.KEEP_RESOLUTION,
'Keep resolution of output raster', False))
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)
mask = self.getParameterValue(self.MASK)
noData = str(self.getParameterValue(self.NO_DATA))
addAlphaBand = self.getParameterValue(self.ALPHA_BAND)
keepResolution = self.getParameterValue(self.KEEP_RESOLUTION)
extra = str(self.getParameterValue(self.EXTRA))
arguments = []
arguments.append('-q')
arguments.append('-of')
arguments.append(GdalUtils.getFormatShortNameFromFilename(out))
arguments.append('-dstnodata')
arguments.append(noData)
if keepResolution:
r = gdal.Open(self.getParameterValue(self.INPUT))
geoTransform = r.GetGeoTransform()
r = None
arguments.append('-tr')
arguments.append(str(geoTransform[1]))
arguments.append(str(geoTransform[5]))
arguments.append('-tap')
arguments.append('-cutline')
arguments.append(mask)
arguments.append('-crop_to_cutline')
if addAlphaBand:
arguments.append('-dstalpha')
if len(extra) > 0:
arguments.append(extra)
arguments.append(self.getParameterValue(self.INPUT))
arguments.append(out)
GdalUtils.runGdal(['gdalwarp', GdalUtils.escapeAndJoin(arguments)],
progress)
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