[processing] add gdal interpolation (nearest) algorithm (addresses #7201)

Author: alexbruy

python/plugins/processing/gdal/GdalOgrAlgorithmProvider.py

@@ -63,6 +63,7 @@
 from processing.gdal.ColorRelief import ColorRelief
 from processing.gdal.GridInvDist import GridInvDist
 from processing.gdal.GridAverage import GridAverage
+from processing.gdal.GridNearest import GridNearest
 
 from processing.gdal.ogr2ogr import Ogr2Ogr
 from processing.gdal.ogrinfo import OgrInfo
@@ -115,7 +116,7 @@ def createAlgsList(self):
             ClipByExtent(), ClipByMask(), contour(), rasterize(), proximity(),
             sieve(), fillnodata(), ExtractProjection(), gdal2xyz(),
             hillshade(), slope(), aspect(), tri(), tpi(), roughness(),
-            ColorRelief(), GridInvDist(), GridAverage(),
+            ColorRelief(), GridInvDist(), GridAverage(), GridNearest(),
             # ----- OGR tools -----
             OgrInfo(), Ogr2Ogr(), OgrSql(),
             ]

python/plugins/processing/gdal/GridNearest.py

@@ -0,0 +1,97 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    GridNearest.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.ParameterVector import ParameterVector
+from processing.parameters.ParameterTableField import ParameterTableField
+from processing.parameters.ParameterNumber import ParameterNumber
+from processing.outputs.OutputRaster import OutputRaster
+from processing.gdal.GdalUtils import GdalUtils
+from processing.tools.system import *
+
+
+class GridNearest(GeoAlgorithm):
+
+    INPUT = 'INPUT'
+    Z_FIELD = 'Z_FIELD'
+    RADIUS_1 = 'RADIUS_1'
+    RADIUS_2 = 'RADIUS_2'
+    ANGLE = 'ANGLE'
+    NODATA = 'NODATA'
+    OUTPUT = 'OUTPUT'
+
+    #def getIcon(self):
+    #    filepath = os.path.dirname(__file__) + '/icons/dem.png'
+    #    return QIcon(filepath)
+
+    def defineCharacteristics(self):
+        self.name = 'Grid (Nearest neighbor)'
+        self.group = '[GDAL] Analysis'
+        self.addParameter(ParameterVector(self.INPUT, 'Input layer',
+                          [ParameterVector.VECTOR_TYPE_POINT]))
+        self.addParameter(ParameterTableField(self.Z_FIELD, 'Z field',
+                          self.INPUT, ParameterTableField.DATA_TYPE_NUMBER,
+                          True))
+        self.addParameter(ParameterNumber(self.RADIUS_1, 'Radius 1',
+                          0.0, 99999999.999999, 0.0))
+        self.addParameter(ParameterNumber(self.RADIUS_2, 'Radius 2',
+                          0.0, 99999999.999999, 0.0))
+        self.addParameter(ParameterNumber(self.ANGLE, 'Angle',
+                          0.0, 359.0, 0.0))
+        self.addParameter(ParameterNumber(self.NODATA, 'Nodata',
+                          0.0, 99999999.999999, 0.0))
+
+        self.addOutput(OutputRaster(self.OUTPUT, 'Output file'))
+
+    def processAlgorithm(self, progress):
+        arguments = ['-l']
+        arguments.append(
+                os.path.basename(os.path.splitext(
+                        unicode(self.getParameterValue(self.INPUT)))[0]))
+
+        fieldName = self.getParameterValue(self.Z_FIELD)
+        if fieldName is not None and fieldName != '':
+            arguments.append('-zfield')
+            arguments.append(fieldName)
+
+        params = 'nearest'
+        params += ':radius1=%s' % self.getParameterValue(self.RADIUS_1)
+        params += ':radius2=%s' % self.getParameterValue(self.RADIUS_2)
+        params += ':angle=%s' % self.getParameterValue(self.ANGLE)
+        params += ':nodata=%s' % self.getParameterValue(self.NODATA)
+
+        arguments.append('-a')
+        arguments.append(params)
+
+        arguments.append(unicode(self.getParameterValue(self.INPUT)))
+        arguments.append(unicode(self.getOutputValue(self.OUTPUT)))
+
+        GdalUtils.runGdal(['gdal_grid',
+                          GdalUtils.escapeAndJoin(arguments)], progress)