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88 lines
3.2 KiB
Python
88 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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contour.py
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---------------------
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Date : September 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander bruy at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Alexander Bruy'
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__date__ = 'September 2013'
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__copyright__ = '(C) 2013, Alexander Bruy'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from PyQt4 import QtGui
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from qgis.core import *
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.core.parameters import ParameterRaster
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterString
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from processing.core.outputs import OutputVector
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from processing.algs.gdal.GdalUtils import GdalUtils
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class contour(GdalAlgorithm):
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INPUT_RASTER = 'INPUT_RASTER'
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OUTPUT_VECTOR = 'OUTPUT_VECTOR'
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INTERVAL = 'INTERVAL'
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FIELD_NAME = 'FIELD_NAME'
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EXTRA = 'EXTRA'
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def defineCharacteristics(self):
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self.name = 'Contour'
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self.group = '[GDAL] Extraction'
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self.addParameter(ParameterRaster(self.INPUT_RASTER, 'Input layer',
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False))
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self.addParameter(ParameterNumber(self.INTERVAL,
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'Interval between contour lines', 0.0,
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99999999.999999, 10.0))
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self.addParameter(ParameterString(self.FIELD_NAME,
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'Attribute name (if not set, no elevation attribute is attached)',
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'ELEV', optional=True))
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self.addParameter(ParameterString(self.EXTRA,
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'Additional creation parameters', '', optional=True))
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self.addOutput(OutputVector(self.OUTPUT_VECTOR,
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'Output file for contour lines (vector)'))
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def processAlgorithm(self, progress):
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interval = str(self.getParameterValue(self.INTERVAL))
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fieldName = str(self.getParameterValue(self.FIELD_NAME))
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extra = str(self.getParameterValue(self.EXTRA))
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arguments = []
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if len(fieldName) > 0:
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arguments.append('-a')
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arguments.append(fieldName)
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arguments.append('-i')
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arguments.append(interval)
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if len(extra) > 0:
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arguments.append(extra)
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arguments.append(self.getParameterValue(self.INPUT_RASTER))
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arguments.append(self.getOutputValue(self.OUTPUT_VECTOR))
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GdalUtils.runGdal(['gdal_contour',
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GdalUtils.escapeAndJoin(arguments)], progress)
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