def processAlgorithm(self, parameters, context, feedback): interpolationData = ParameterInterpolationData.parseValue(parameters[self.INTERPOLATION_DATA]) method = self.parameterAsEnum(parameters, self.METHOD, context) columns = self.parameterAsInt(parameters, self.COLUMNS, context) rows = self.parameterAsInt(parameters, self.ROWS, context) bbox = self.parameterAsExtent(parameters, self.EXTENT, context) output = self.parameterAsOutputLayer(parameters, self.OUTPUT, context) if interpolationData is None: raise QgsProcessingException( self.tr('You need to specify at least one input layer.')) layerData = [] layers = [] crs = QgsCoordinateReferenceSystem() for row in interpolationData.split(';'): v = row.split('::~::') data = QgsInterpolator.LayerData() # need to keep a reference until interpolation is complete layer = QgsProcessingUtils.variantToSource(v[0], context) data.source = layer layers.append(layer) if not crs.isValid(): crs = layer.sourceCrs() data.valueSource = int(v[1]) data.interpolationAttribute = int(v[2]) if v[3] == '0': data.sourceType = QgsInterpolator.SourcePoints elif v[3] == '1': data.sourceType = QgsInterpolator.SourceStructureLines else: data.sourceType = QgsInterpolator.SourceBreakLines layerData.append(data) if method == 0: interpolationMethod = QgsTinInterpolator.Linear else: interpolationMethod = QgsTinInterpolator.CloughTocher (triangulation_sink, triangulation_dest_id) = self.parameterAsSink(parameters, self.TRIANGULATION, context, QgsTinInterpolator.triangulationFields(), QgsWkbTypes.LineString, crs) interpolator = QgsTinInterpolator(layerData, interpolationMethod, feedback) if triangulation_sink is not None: interpolator.setTriangulationSink(triangulation_sink) writer = QgsGridFileWriter(interpolator, output, bbox, columns, rows) writer.writeFile(feedback) return {self.OUTPUT: output, self.TRIANGULATION: triangulation_dest_id}
def processAlgorithm(self, parameters, context, feedback): interpolationData = ParameterInterpolationData.parseValue(parameters[self.INTERPOLATION_DATA]) method = self.parameterAsEnum(parameters, self.METHOD, context) columns = self.parameterAsInt(parameters, self.COLUMNS, context) rows = self.parameterAsInt(parameters, self.ROWS, context) bbox = self.parameterAsExtent(parameters, self.EXTENT, context) output = self.parameterAsOutputLayer(parameters, self.OUTPUT, context) if interpolationData is None: raise QgsProcessingException( self.tr('You need to specify at least one input layer.')) layerData = [] layers = [] crs = QgsCoordinateReferenceSystem() for row in interpolationData.split(';'): v = row.split(',') data = QgsInterpolator.LayerData() # need to keep a reference until interpolation is complete layer = QgsProcessingUtils.variantToSource(v[0], context) data.source = layer layers.append(layer) if not crs.isValid(): crs = layer.sourceCrs() data.valueSource = int(v[1]) data.interpolationAttribute = int(v[2]) if v[3] == '0': data.sourceType = QgsInterpolator.SourcePoints elif v[3] == '1': data.sourceType = QgsInterpolator.SourceStructureLines else: data.sourceType = QgsInterpolator.SourceBreakLines layerData.append(data) if method == 0: interpolationMethod = QgsTinInterpolator.Linear else: interpolationMethod = QgsTinInterpolator.CloughTocher (triangulation_sink, triangulation_dest_id) = self.parameterAsSink(parameters, self.TRIANGULATION, context, QgsTinInterpolator.triangulationFields(), QgsWkbTypes.LineString, crs) interpolator = QgsTinInterpolator(layerData, interpolationMethod, feedback) if triangulation_sink is not None: interpolator.setTriangulationSink(triangulation_sink) writer = QgsGridFileWriter(interpolator, output, bbox, columns, rows) writer.writeFile(feedback) return {self.OUTPUT: output, self.TRIANGULATION: triangulation_dest_id}
def calcIsoTinInterpolation(self, iso_point_layer, resolution, interpolation_raster_path): if self.AnalysisCrs.isGeographic(): raise QgsProcessingException( 'The TIN-Interpolation algorithm in QGIS is designed to work with projected coordinate systems.Please use a projected coordinate system (eg. UTM zones) instead of geographic coordinate systems (eg. WGS84)!' ) layer_data = QgsInterpolator.LayerData() QgsInterpolator.LayerData layer_data.source = iso_point_layer #in QGIS2: vectorLayer layer_data.valueSource = QgsInterpolator.ValueAttribute layer_data.interpolationAttribute = 1 #take second field to get costs layer_data.sourceType = QgsInterpolator.SourcePoints tin_interpolator = QgsTinInterpolator([layer_data], QgsTinInterpolator.Linear) rect = iso_point_layer.extent() ncol = int((rect.xMaximum() - rect.xMinimum()) / resolution) nrows = int((rect.yMaximum() - rect.yMinimum()) / resolution) writer = QgsGridFileWriter(tin_interpolator, interpolation_raster_path, rect, ncol, nrows) writer.writeFile(self.feedback) # Creating .asc raste return QgsRasterLayer(interpolation_raster_path, "temp_qneat3_interpolation_raster")
def calcIsoInterpolation(self, iso_point_layer, resolution, interpolation_raster_path): layer_data = QgsInterpolator.LayerData() layer_data.source = iso_point_layer #in QGIS2: vectorLayer layer_data.valueSource = QgsInterpolator.ValueAttribute layer_data.interpolationAttribute = 1 #take second field to get costs layer_data.sourceType = QgsInterpolator.SourcePoints tin_interpolator = QgsTinInterpolator([layer_data], QgsTinInterpolator.Linear) rect = iso_point_layer.extent() ncol = int((rect.xMaximum() - rect.xMinimum()) / resolution) nrows = int((rect.yMaximum() - rect.yMinimum()) / resolution) writer = QgsGridFileWriter(tin_interpolator, self.interpolation_raster_path, rect, ncol, nrows, resolution, resolution) writer.writeFile(self.feedback) # Creating .asc raste return QgsRasterLayer(self.interpolation_raster_path, "temp_qneat3_interpolation_raster", True)