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148 lines
6.2 KiB
Python
148 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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IdwInterpolationAttribute.py
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---------------------
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Date : October 2016
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Copyright : (C) 2016 by Alexander Bruy
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Email : alexander dot 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__ = 'October 2016'
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__copyright__ = '(C) 2016, 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 qgis.PyQt.QtGui import QIcon
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from qgis.core import QgsRectangle
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from qgis.analysis import (QgsInterpolator,
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QgsIDWInterpolator,
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QgsGridFileWriter
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)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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from processing.core.parameters import ParameterSelection
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterExtent
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from processing.core.outputs import OutputRaster
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class IdwInterpolationAttribute(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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ATTRIBUTE = 'ATTRIBUTE'
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LAYER_TYPE = 'LAYER_TYPE'
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DISTANCE_COEFFICIENT = 'DISTANCE_COEFFICIENT'
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COLUMNS = 'COLUMNS'
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ROWS = 'ROWS'
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CELLSIZE_X = 'CELLSIZE_X'
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CELLSIZE_Y = 'CELLSIZE_Y'
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EXTENT = 'EXTENT'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'interpolation.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('IDW interpolation (using attribute)')
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self.group, self.i18n_group = self.trAlgorithm('Interpolation')
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self.TYPES = [self.tr('Points'),
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self.tr('Structure lines'),
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self.tr('Break lines')
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]
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Vector layer')))
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self.addParameter(ParameterTableField(self.ATTRIBUTE,
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self.tr('Interpolation attribute'),
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self.INPUT_LAYER,
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ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterSelection(self.LAYER_TYPE,
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self.tr('Type'),
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self.TYPES,
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0))
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self.addParameter(ParameterNumber(self.DISTANCE_COEFFICIENT,
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self.tr('Distance coefficient P'),
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0.0, 99.99, 2.0))
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self.addParameter(ParameterNumber(self.COLUMNS,
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self.tr('Number of columns'),
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0, 10000000, 300))
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self.addParameter(ParameterNumber(self.ROWS,
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self.tr('Number of rows'),
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0, 10000000, 300))
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self.addParameter(ParameterNumber(self.CELLSIZE_X,
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self.tr('Cellsize X'),
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0.0, 999999.000000, 0.0))
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self.addParameter(ParameterNumber(self.CELLSIZE_Y,
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self.tr('Cellsize Y'),
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0.0, 999999.000000, 0.0))
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self.addParameter(ParameterExtent(self.EXTENT,
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self.tr('Extent')))
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self.addOutput(OutputRaster(self.OUTPUT_LAYER,
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self.tr('Interpolated')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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fieldName = self.getParameterValue(self.ATTRIBUTE)
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layerType = self.getParameterValue(self.LAYER_TYPE)
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coefficient = self.getParameterValue(self.DISTANCE_COEFFICIENT)
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columns = self.getParameterValue(self.COLUMNS)
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rows = self.getParameterValue(self.ROWS)
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cellsizeX = self.getParameterValue(self.CELLSIZE_X)
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cellsizeY = self.getParameterValue(self.CELLSIZE_Y)
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extent = self.getParameterValue(self.EXTENT).split(',')
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output = self.getOutputValue(self.OUTPUT_LAYER)
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xMin = float(extent[0])
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xMax = float(extent[1])
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yMin = float(extent[2])
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yMax = float(extent[3])
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bbox = QgsRectangle(xMin, yMin, xMax, yMax)
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layerData = QgsInterpolator.LayerData()
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layerData.vectorLayer = layer
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layerData.zCoordInterpolation = False
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layerData.interpolationAttribute = layer.dataProvider().fieldNameIndex(fieldName)
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if layerType == 0:
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layerData.mInputType = QgsInterpolator.POINTS
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elif layerType == 1:
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layerData.mInputType = QgsInterpolator.STRUCTURE_LINES
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else:
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layerData.mInputType = QgsInterpolator.BREAK_LINES
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interpolator = QgsIDWInterpolator([layerData])
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interpolator.setDistanceCoefficient(coefficient)
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writer = QgsGridFileWriter(interpolator,
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output,
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bbox,
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columns,
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rows,
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cellsizeX,
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cellsizeY)
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writer.writeFile()
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