def test_clip_raster(self): """Test clip_raster work""" new_raster = clip_raster(self.raster, self.raster.width(), self.raster.height(), self.extent) self.assertEqual(self.raster.rasterUnitsPerPixelY(), new_raster.rasterUnitsPerPixelY()) self.assertEqual(self.raster.rasterUnitsPerPixelX(), new_raster.rasterUnitsPerPixelX()) self.assertEqual(self.raster.extent(), new_raster.extent()) self.assertEqual(self.raster.width(), new_raster.width()) self.assertEqual(self.raster.height(), new_raster.height()) # Set extent as 1/2 of self.extent center = self.extent.center() x_max, y_max = center.x(), center.y() new_extent = QgsRectangle(self.extent.xMinimum(), self.extent.yMinimum(), x_max, y_max) new_raster = clip_raster(self.raster, self.raster.width(), self.raster.height(), new_extent) self.assertAlmostEquals(self.raster.rasterUnitsPerPixelY(), 2 * new_raster.rasterUnitsPerPixelY()) self.assertAlmostEquals(self.raster.rasterUnitsPerPixelX(), 2 * new_raster.rasterUnitsPerPixelX()) self.assertEqual(new_extent, new_raster.extent()) self.assertEqual(self.raster.width(), new_raster.width()) self.assertEqual(self.raster.height(), new_raster.height())
def test_clip_raster(self): """Test clip_raster work""" new_raster = clip_raster( self.raster, self.raster.width(), self.raster.height(), self.extent ) self.assertEqual(self.raster.rasterUnitsPerPixelY(), new_raster.rasterUnitsPerPixelY()) self.assertEqual(self.raster.rasterUnitsPerPixelX(), new_raster.rasterUnitsPerPixelX()) self.assertEqual(self.raster.extent(), new_raster.extent()) self.assertEqual(self.raster.width(), new_raster.width()) self.assertEqual(self.raster.height(), new_raster.height()) # Set extent as 1/2 of self.extent center = self.extent.center() x_max, y_max = center.x(), center.y() new_extent = QgsRectangle( self.extent.xMinimum(), self.extent.yMinimum(), x_max, y_max ) new_raster = clip_raster( self.raster, self.raster.width(), self.raster.height(), new_extent ) self.assertAlmostEquals( self.raster.rasterUnitsPerPixelY(), 2 * new_raster.rasterUnitsPerPixelY()) self.assertAlmostEquals( self.raster.rasterUnitsPerPixelX(), 2 * new_raster.rasterUnitsPerPixelX()) self.assertEqual(new_extent, new_raster.extent()) self.assertEqual(self.raster.width(), new_raster.width()) self.assertEqual(self.raster.height(), new_raster.height())
def run(self, layers=None): """Run the impact function. :param layers: List of layers expected to contain at least: H: Polygon layer of inundation areas E: Vector layer of roads :type layers: list :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare(layers) target_field = self.target_field road_type_field = self.parameters['road_type_field'] threshold_min = self.parameters['min threshold [m]'] threshold_max = self.parameters['max threshold [m]'] if threshold_min > threshold_max: message = tr( 'The minimal threshold is greater then the maximal specified ' 'threshold. Please check the values.') raise GetDataError(message) # Extract data H = self.hazard # Flood E = self.exposure # Roads H = H.get_layer() E = E.get_layer() # reproject self.extent to the hazard projection hazard_crs = H.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = H.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] # TODO: Why have these two clauses when they are not used? # Commenting out for now. # if viewport_extent[2] < clip_xmax: # clip_xmax = viewport_extent[2] # if viewport_extent[3] < clip_ymax: # clip_ymax = viewport_extent[3] height = ((viewport_extent[3] - viewport_extent[1]) / H.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / H.rasterUnitsPerPixelX()) width = int(width) raster_extent = H.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / H.width() x = xmin for i in range(H.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / H.height() y = ymin for i in range(H.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip and polygonize small_raster = clip_raster(H, width, height, QgsRectangle(*clip_extent)) (flooded_polygon_inside, flooded_polygon_outside) = polygonize_gdal(small_raster, threshold_min, threshold_max) # Filter geometry and data using the extent extent = QgsRectangle(*self.requested_extent) request = QgsFeatureRequest() request.setFilterRect(extent) if flooded_polygon_inside is None: message = tr( 'There are no objects in the hazard layer with "value">%s.' 'Please check the value or use other extent.' % (threshold_min, )) raise GetDataError(message) # reproject the flood polygons to exposure projection exposure_crs = E.crs() exposure_authid = exposure_crs.authid() if hazard_authid != exposure_authid: flooded_polygon_inside = reproject_vector_layer( flooded_polygon_inside, E.crs()) flooded_polygon_outside = reproject_vector_layer( flooded_polygon_outside, E.crs()) # Clip exposure by the extent # extent_as_polygon = QgsGeometry().fromRect(extent) # no need to clip since It is using a bbox request # line_layer = clip_by_polygon( # E, # extent_as_polygon # ) # Find inundated roads, mark them line_layer = split_by_polygon_in_out(E, flooded_polygon_inside, flooded_polygon_outside, target_field, 1, request) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(E.crs(), output_crs) road_len = flooded_len = 0 # Length of roads roads_by_type = dict() # Length of flooded roads by types roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_type_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() road_len += length if road_type not in roads_by_type: roads_by_type[road_type] = {'flooded': 0, 'total': 0} roads_by_type[road_type]['total'] += length if attributes[target_field_index] == 1: flooded_len += length roads_by_type[road_type]['flooded'] += length table_body = self._tabulate(flooded_len, self.question, road_len, roads_by_type) impact_summary = Table(table_body).toNewlineFreeString() map_title = tr('Roads inundated') style_classes = [ dict(label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict(label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5) ] style_info = dict(target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector(data=line_layer, name=tr('Flooded roads'), keywords={ 'impact_summary': impact_summary, 'map_title': map_title, 'target_field': target_field }, style_info=style_info) self._impact = line_layer return line_layer
def run(self): """Run the impact function. :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare() target_field = self.target_field # Get parameters from layer's keywords road_class_field = self.exposure.keyword('road_class_field') # Get parameters from IF parameter threshold_min = self.parameters['min threshold'].value threshold_max = self.parameters['max threshold'].value if threshold_min > threshold_max: message = tr( 'The minimal threshold is greater than the maximal specified ' 'threshold. Please check the values.') raise GetDataError(message) # reproject self.extent to the hazard projection hazard_crs = self.hazard.layer.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = self.hazard.layer.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] # TODO: Why have these two clauses when they are not used? # Commenting out for now. # if viewport_extent[2] < clip_xmax: # clip_xmax = viewport_extent[2] # if viewport_extent[3] < clip_ymax: # clip_ymax = viewport_extent[3] height = ((viewport_extent[3] - viewport_extent[1]) / self.hazard.layer.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / self.hazard.layer.rasterUnitsPerPixelX()) width = int(width) raster_extent = self.hazard.layer.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / self.hazard.layer.width() x = xmin for i in range(self.hazard.layer.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / self.hazard.layer.height() y = ymin for i in range(self.hazard.layer.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip hazard raster small_raster = clip_raster(self.hazard.layer, width, height, QgsRectangle(*clip_extent)) # Create vector features from the flood raster # For each raster cell there is one rectangular polygon # Data also get spatially indexed for faster operation index, flood_cells_map = _raster_to_vector_cells( small_raster, threshold_min, threshold_max, self.exposure.layer.crs()) # Filter geometry and data using the extent ct = QgsCoordinateTransform(QgsCoordinateReferenceSystem("EPSG:4326"), self.exposure.layer.crs()) extent = ct.transformBoundingBox(QgsRectangle(*self.requested_extent)) request = QgsFeatureRequest() request.setFilterRect(extent) if len(flood_cells_map) == 0: message = tr( 'There are no objects in the hazard layer with "value" > %s. ' 'Please check the value or use other extent.' % (threshold_min, )) raise GetDataError(message) # create template for the output layer line_layer_tmp = create_layer(self.exposure.layer) new_field = QgsField(target_field, QVariant.Int) line_layer_tmp.dataProvider().addAttributes([new_field]) line_layer_tmp.updateFields() # create empty output layer and load it filename = unique_filename(suffix='.shp') QgsVectorFileWriter.writeAsVectorFormat(line_layer_tmp, filename, "utf-8", None, "ESRI Shapefile") line_layer = QgsVectorLayer(filename, "flooded roads", "ogr") # Do the heavy work - for each road get flood polygon for that area and # do the intersection/difference to find out which parts are flooded _intersect_lines_with_vector_cells(self.exposure.layer, request, index, flood_cells_map, line_layer, target_field) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(self.exposure.layer.crs(), output_crs) flooded_keyword = tr('Flooded in the threshold (m)') self.affected_road_categories = [flooded_keyword] self.affected_road_lengths = OrderedDict([(flooded_keyword, {})]) self.road_lengths = OrderedDict() if line_layer.featureCount() < 1: raise ZeroImpactException() roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_class_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() if road_type not in self.road_lengths: self.affected_road_lengths[flooded_keyword][road_type] = 0 self.road_lengths[road_type] = 0 self.road_lengths[road_type] += length if attributes[target_field_index] == 1: self.affected_road_lengths[flooded_keyword][ road_type] += length impact_summary = self.html_report() # For printing map purpose map_title = tr('Roads inundated') legend_title = tr('Road inundated status') style_classes = [ dict(label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict(label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5) ] style_info = dict(target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector(data=line_layer, name=tr('Flooded roads'), keywords={ 'impact_summary': impact_summary, 'map_title': map_title, 'legend_title': legend_title, 'target_field': target_field }, style_info=style_info) self._impact = line_layer return line_layer
def run(self, layers=None): """Run the impact function. :param layers: List of layers expected to contain at least: H: Polygon layer of inundation areas E: Vector layer of roads :type layers: list :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare(layers) target_field = self.target_field road_type_field = self.parameters['road_type_field'] threshold_min = self.parameters['min threshold [m]'] threshold_max = self.parameters['max threshold [m]'] if threshold_min > threshold_max: message = tr( 'The minimal threshold is greater then the maximal specified ' 'threshold. Please check the values.') raise GetDataError(message) # Extract data H = self.hazard # Flood E = self.exposure # Roads H = H.get_layer() E = E.get_layer() # reproject self.extent to the hazard projection hazard_crs = H.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = H.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] # TODO: Why have these two clauses when they are not used? # Commenting out for now. # if viewport_extent[2] < clip_xmax: # clip_xmax = viewport_extent[2] # if viewport_extent[3] < clip_ymax: # clip_ymax = viewport_extent[3] height = ((viewport_extent[3] - viewport_extent[1]) / H.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / H.rasterUnitsPerPixelX()) width = int(width) raster_extent = H.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / H.width() x = xmin for i in range(H.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / H.height() y = ymin for i in range(H.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip and polygonize small_raster = clip_raster( H, width, height, QgsRectangle(*clip_extent)) (flooded_polygon_inside, flooded_polygon_outside) = polygonize_gdal( small_raster, threshold_min, threshold_max) # Filter geometry and data using the extent extent = QgsRectangle(*self.requested_extent) request = QgsFeatureRequest() request.setFilterRect(extent) if flooded_polygon_inside is None: message = tr( 'There are no objects in the hazard layer with "value">%s.' 'Please check the value or use other extent.' % ( threshold_min, )) raise GetDataError(message) # reproject the flood polygons to exposure projection exposure_crs = E.crs() exposure_authid = exposure_crs.authid() if hazard_authid != exposure_authid: flooded_polygon_inside = reproject_vector_layer( flooded_polygon_inside, E.crs()) flooded_polygon_outside = reproject_vector_layer( flooded_polygon_outside, E.crs()) # Clip exposure by the extent # extent_as_polygon = QgsGeometry().fromRect(extent) # no need to clip since It is using a bbox request # line_layer = clip_by_polygon( # E, # extent_as_polygon # ) # Find inundated roads, mark them line_layer = split_by_polygon_in_out( E, flooded_polygon_inside, flooded_polygon_outside, target_field, 1, request) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(E.crs(), output_crs) road_len = flooded_len = 0 # Length of roads roads_by_type = dict() # Length of flooded roads by types roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_type_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() road_len += length if road_type not in roads_by_type: roads_by_type[road_type] = {'flooded': 0, 'total': 0} roads_by_type[road_type]['total'] += length if attributes[target_field_index] == 1: flooded_len += length roads_by_type[road_type]['flooded'] += length table_body = self._tabulate(flooded_len, self.question, road_len, roads_by_type) impact_summary = Table(table_body).toNewlineFreeString() map_title = tr('Roads inundated') style_classes = [ dict( label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict( label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5)] style_info = dict( target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector( data=line_layer, name=tr('Flooded roads'), keywords={ 'impact_summary': impact_summary, 'map_title': map_title, 'target_field': target_field}, style_info=style_info) self._impact = line_layer return line_layer
def run(self): """Run the impact function. :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare() self.provenance.append_step( 'Calculating Step', 'Impact function is calculating the impact.') # Thresholds for tsunami hazard zone breakdown. low_max = self.parameters['low_threshold'].value medium_max = self.parameters['medium_threshold'].value high_max = self.parameters['high_threshold'].value target_field = self.target_field # Get parameters from layer's keywords road_class_field = self.exposure.keyword('road_class_field') # reproject self.extent to the hazard projection hazard_crs = self.hazard.layer.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = self.hazard.layer.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] height = ((viewport_extent[3] - viewport_extent[1]) / self.hazard.layer.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / self.hazard.layer.rasterUnitsPerPixelX()) width = int(width) raster_extent = self.hazard.layer.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / self.hazard.layer.width() x = xmin for i in range(self.hazard.layer.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / self.hazard.layer.height() y = ymin for i in range(self.hazard.layer.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip hazard raster small_raster = clip_raster(self.hazard.layer, width, height, QgsRectangle(*clip_extent)) # Create vector features from the flood raster # For each raster cell there is one rectangular polygon # Data also get spatially indexed for faster operation ranges = OrderedDict() ranges[0] = [0.0, 0.0] ranges[1] = [0.0, low_max] ranges[2] = [low_max, medium_max] ranges[3] = [medium_max, high_max] ranges[4] = [high_max, None] index, flood_cells_map = _raster_to_vector_cells( small_raster, ranges, self.exposure.layer.crs()) # Filter geometry and data using the extent ct = QgsCoordinateTransform(QgsCoordinateReferenceSystem("EPSG:4326"), self.exposure.layer.crs()) extent = ct.transformBoundingBox(QgsRectangle(*self.requested_extent)) request = QgsFeatureRequest() request.setFilterRect(extent) """ if len(low_max_flood_cells_map) == 0 and \ len(medium_max_flood_cells_map) == 0 and \ len(high_max_flood_cells_map) == 0 and \ len(high_min_flood_cells_map) == 0: message = tr( 'There are no objects in the hazard layer with "value" > 0. ' 'Please check the value or use other extent.' % ( threshold_min, )) raise GetDataError(message) """ # create template for the output layer line_layer_tmp = create_layer(self.exposure.layer) new_field = QgsField(target_field, QVariant.Int) line_layer_tmp.dataProvider().addAttributes([new_field]) line_layer_tmp.updateFields() # create empty output layer and load it filename = unique_filename(suffix='.shp') QgsVectorFileWriter.writeAsVectorFormat(line_layer_tmp, filename, "utf-8", None, "ESRI Shapefile") line_layer = QgsVectorLayer(filename, "flooded roads", "ogr") # Do the heavy work - for each road get flood polygon for that area and # do the intersection/difference to find out which parts are flooded _intersect_lines_with_vector_cells(self.exposure.layer, request, index, flood_cells_map, line_layer, target_field) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(self.exposure.layer.crs(), output_crs) # Roads breakdown self.road_lengths = OrderedDict() self.affected_road_categories = self.hazard_classes # Impacted roads breakdown self.affected_road_lengths = OrderedDict([ (self.hazard_classes[0], {}), (self.hazard_classes[1], {}), (self.hazard_classes[2], {}), (self.hazard_classes[3], {}), (self.hazard_classes[4], {}), ]) if line_layer.featureCount() < 1: raise ZeroImpactException() roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_class_field) for road in roads_data: attributes = road.attributes() affected = attributes[target_field_index] hazard_zone = self.hazard_classes[affected] road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() if road_type not in self.road_lengths: self.road_lengths[road_type] = 0 if hazard_zone not in self.affected_road_lengths: self.affected_road_lengths[hazard_zone] = {} if road_type not in self.affected_road_lengths[hazard_zone]: self.affected_road_lengths[hazard_zone][road_type] = 0 self.road_lengths[road_type] += length num_classes = len(self.hazard_classes) if attributes[target_field_index] in range(num_classes): self.affected_road_lengths[hazard_zone][road_type] += length impact_summary = self.html_report() # For printing map purpose map_title = tr('Roads inundated') legend_title = tr('Road inundated status') style_classes = [ # FIXME 0 - 0.1 dict(label=self.hazard_classes[0] + ': 0m', value=0, colour='#00FF00', transparency=0, size=1), dict(label=self.hazard_classes[1] + ': <0 - %.1f m' % low_max, value=1, colour='#FFFF00', transparency=0, size=1), dict(label=self.hazard_classes[2] + ': %.1f - %.1f m' % (low_max + 0.1, medium_max), value=2, colour='#FFB700', transparency=0, size=1), dict(label=self.hazard_classes[3] + ': %.1f - %.1f m' % (medium_max + 0.1, high_max), value=3, colour='#FF6F00', transparency=0, size=1), dict(label=self.hazard_classes[4] + ' > %.1f m' % high_max, value=4, colour='#FF0000', transparency=0, size=1), ] style_info = dict(target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') extra_keywords = { 'impact_summary': impact_summary, 'map_title': map_title, 'legend_title': legend_title, 'target_field': target_field } self.set_if_provenance() impact_layer_keywords = self.generate_impact_keywords(extra_keywords) # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector(data=line_layer, name=tr('Flooded roads'), keywords=impact_layer_keywords, style_info=style_info) self._impact = line_layer return line_layer
def run(self): """Run the impact function. :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare() self.provenance.append_step( 'Calculating Step', 'Impact function is calculating the impact.') # Thresholds for tsunami hazard zone breakdown. low_max = self.parameters['low_threshold'].value medium_max = self.parameters['medium_threshold'].value high_max = self.parameters['high_threshold'].value target_field = self.target_field # Get parameters from layer's keywords road_class_field = self.exposure.keyword('road_class_field') # reproject self.extent to the hazard projection hazard_crs = self.hazard.layer.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = self.hazard.layer.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] height = ((viewport_extent[3] - viewport_extent[1]) / self.hazard.layer.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / self.hazard.layer.rasterUnitsPerPixelX()) width = int(width) raster_extent = self.hazard.layer.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / self.hazard.layer.width() x = xmin for i in range(self.hazard.layer.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / self.hazard.layer.height() y = ymin for i in range(self.hazard.layer.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip hazard raster small_raster = clip_raster( self.hazard.layer, width, height, QgsRectangle(*clip_extent)) # Create vector features from the flood raster # For each raster cell there is one rectangular polygon # Data also get spatially indexed for faster operation ranges = OrderedDict() ranges[0] = [0.0, 0.0] ranges[1] = [0.0, low_max] ranges[2] = [low_max, medium_max] ranges[3] = [medium_max, high_max] ranges[4] = [high_max, None] index, flood_cells_map = _raster_to_vector_cells( small_raster, ranges, self.exposure.layer.crs()) # Filter geometry and data using the extent ct = QgsCoordinateTransform( QgsCoordinateReferenceSystem("EPSG:4326"), self.exposure.layer.crs()) extent = ct.transformBoundingBox(QgsRectangle(*self.requested_extent)) request = QgsFeatureRequest() request.setFilterRect(extent) """ if len(low_max_flood_cells_map) == 0 and \ len(medium_max_flood_cells_map) == 0 and \ len(high_max_flood_cells_map) == 0 and \ len(high_min_flood_cells_map) == 0: message = tr( 'There are no objects in the hazard layer with "value" > 0. ' 'Please check the value or use other extent.' % ( threshold_min, )) raise GetDataError(message) """ # create template for the output layer line_layer_tmp = create_layer(self.exposure.layer) new_field = QgsField(target_field, QVariant.Int) line_layer_tmp.dataProvider().addAttributes([new_field]) line_layer_tmp.updateFields() # create empty output layer and load it filename = unique_filename(suffix='.shp') QgsVectorFileWriter.writeAsVectorFormat( line_layer_tmp, filename, "utf-8", None, "ESRI Shapefile") line_layer = QgsVectorLayer(filename, "flooded roads", "ogr") # Do the heavy work - for each road get flood polygon for that area and # do the intersection/difference to find out which parts are flooded _intersect_lines_with_vector_cells( self.exposure.layer, request, index, flood_cells_map, line_layer, target_field) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform( self.exposure.layer.crs(), output_crs) # Roads breakdown self.road_lengths = OrderedDict() self.affected_road_categories = self.hazard_classes # Impacted roads breakdown self.affected_road_lengths = OrderedDict([ (self.hazard_classes[0], {}), (self.hazard_classes[1], {}), (self.hazard_classes[2], {}), (self.hazard_classes[3], {}), (self.hazard_classes[4], {}), ]) if line_layer.featureCount() < 1: raise ZeroImpactException() roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_class_field) for road in roads_data: attributes = road.attributes() affected = attributes[target_field_index] hazard_zone = self.hazard_classes[affected] road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() if road_type not in self.road_lengths: self.road_lengths[road_type] = 0 if hazard_zone not in self.affected_road_lengths: self.affected_road_lengths[hazard_zone] = {} if road_type not in self.affected_road_lengths[hazard_zone]: self.affected_road_lengths[hazard_zone][road_type] = 0 self.road_lengths[road_type] += length num_classes = len(self.hazard_classes) if attributes[target_field_index] in range(num_classes): self.affected_road_lengths[hazard_zone][road_type] += length impact_summary = self.html_report() # For printing map purpose map_title = tr('Roads inundated') legend_title = tr('Road inundated status') style_classes = [ # FIXME 0 - 0.1 dict( label=self.hazard_classes[0] + ': 0m', value=0, colour='#00FF00', transparency=0, size=1 ), dict( label=self.hazard_classes[1] + ': <0 - %.1f m' % low_max, value=1, colour='#FFFF00', transparency=0, size=1 ), dict( label=self.hazard_classes[2] + ': %.1f - %.1f m' % ( low_max + 0.1, medium_max), value=2, colour='#FFB700', transparency=0, size=1 ), dict( label=self.hazard_classes[3] + ': %.1f - %.1f m' % ( medium_max + 0.1, high_max), value=3, colour='#FF6F00', transparency=0, size=1 ), dict( label=self.hazard_classes[4] + ' > %.1f m' % high_max, value=4, colour='#FF0000', transparency=0, size=1 ), ] style_info = dict( target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') extra_keywords = { 'impact_summary': impact_summary, 'map_title': map_title, 'legend_title': legend_title, 'target_field': target_field } self.set_if_provenance() impact_layer_keywords = self.generate_impact_keywords(extra_keywords) # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector( data=line_layer, name=tr('Flooded roads'), keywords=impact_layer_keywords, style_info=style_info) self._impact = line_layer return line_layer
def run(self, layers=None): """Experimental impact function.""" self.validate() self.prepare(layers) target_field = self.target_field road_type_field = self.parameters['road_type_field'] threshold_min = self.parameters['min threshold [m]'] threshold_max = self.parameters['max threshold [m]'] if threshold_min > threshold_max: message = tr('''The minimal threshold is greater then the maximal specified threshold. Please check the values.''') raise GetDataError(message) # Extract data H = self.hazard # Flood E = self.exposure # Roads H = H.get_layer() E = E.get_layer() # Get necessary width and height of raster height = (self.requested_extent[3] - self.requested_extent[1]) / (H.rasterUnitsPerPixelY()) height = int(height) width = (self.requested_extent[2] - self.requested_extent[0]) / (H.rasterUnitsPerPixelX()) width = int(width) # Align raster extent and self.extent raster_extent = H.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / H.width() x = xmin for i in range(H.width()): if abs(x - self.requested_extent[0]) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / H.height() y = ymin for i in range(H.width()): if abs(y - self.requested_extent[1]) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip and polygonize small_raster = clip_raster(H, width, height, QgsRectangle(*clip_extent)) flooded_polygon = polygonize(small_raster, threshold_min, threshold_max) # Filter geometry and data using the extent requested_extent = QgsRectangle(*self.requested_extent) request = QgsFeatureRequest() request.setFilterRect(requested_extent) if flooded_polygon is None: message = tr('''There are no objects in the hazard layer with "value">'%s'. Please check the value or use other extent.''' % (threshold_min, )) raise GetDataError(message) # Clip exposure by the extent extent_as_polygon = QgsGeometry().fromRect(requested_extent) line_layer = clip_by_polygon(E, extent_as_polygon) # Find inundated roads, mark them line_layer = split_by_polygon(line_layer, flooded_polygon, request, mark_value=(target_field, 1)) # Find inundated roads, mark them # line_layer = split_by_polygon( # E, # flooded_polygon, # request, # mark_value=(target_field, 1)) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(E.crs(), output_crs) road_len = flooded_len = 0 # Length of roads roads_by_type = dict() # Length of flooded roads by types roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_type_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() road_len += length if road_type not in roads_by_type: roads_by_type[road_type] = {'flooded': 0, 'total': 0} roads_by_type[road_type]['total'] += length if attributes[target_field_index] == 1: flooded_len += length roads_by_type[road_type]['flooded'] += length table_body = self._tabulate(flooded_len, self.question, road_len, roads_by_type) impact_summary = Table(table_body).toNewlineFreeString() map_title = tr('Roads inundated') style_classes = [ dict(label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict(label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5) ] style_info = dict(target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector(data=line_layer, name=tr('Flooded roads'), keywords={ 'impact_summary': impact_summary, 'map_title': map_title, 'target_field': target_field }, style_info=style_info) self._impact = line_layer return line_layer
def run(self, layers=None): """Experimental impact function.""" self.validate() self.prepare(layers) target_field = self.target_field road_type_field = self.parameters['road_type_field'] threshold_min = self.parameters['min threshold [m]'] threshold_max = self.parameters['max threshold [m]'] if threshold_min > threshold_max: message = tr('''The minimal threshold is greater then the maximal specified threshold. Please check the values.''') raise GetDataError(message) # Extract data H = self.hazard # Flood E = self.exposure # Roads H = H.get_layer() E = E.get_layer() # Get necessary width and height of raster height = (self.requested_extent[3] - self.requested_extent[1]) / ( H.rasterUnitsPerPixelY()) height = int(height) width = (self.requested_extent[2] - self.requested_extent[0]) / ( H.rasterUnitsPerPixelX()) width = int(width) # Align raster extent and self.extent raster_extent = H.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / H.width() x = xmin for i in range(H.width()): if abs(x - self.requested_extent[0]) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / H.height() y = ymin for i in range(H.width()): if abs(y - self.requested_extent[1]) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip and polygonize small_raster = clip_raster( H, width, height, QgsRectangle(*clip_extent)) flooded_polygon = polygonize( small_raster, threshold_min, threshold_max) # Filter geometry and data using the extent requested_extent = QgsRectangle(*self.requested_extent) request = QgsFeatureRequest() request.setFilterRect(requested_extent) if flooded_polygon is None: message = tr('''There are no objects in the hazard layer with "value">'%s'. Please check the value or use other extent.''' % (threshold_min, )) raise GetDataError(message) # Clip exposure by the extent extent_as_polygon = QgsGeometry().fromRect(requested_extent) line_layer = clip_by_polygon( E, extent_as_polygon ) # Find inundated roads, mark them line_layer = split_by_polygon( line_layer, flooded_polygon, request, mark_value=(target_field, 1)) # Find inundated roads, mark them # line_layer = split_by_polygon( # E, # flooded_polygon, # request, # mark_value=(target_field, 1)) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform(E.crs(), output_crs) road_len = flooded_len = 0 # Length of roads roads_by_type = dict() # Length of flooded roads by types roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_type_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() road_len += length if road_type not in roads_by_type: roads_by_type[road_type] = {'flooded': 0, 'total': 0} roads_by_type[road_type]['total'] += length if attributes[target_field_index] == 1: flooded_len += length roads_by_type[road_type]['flooded'] += length table_body = self._tabulate(flooded_len, self.question, road_len, roads_by_type) impact_summary = Table(table_body).toNewlineFreeString() map_title = tr('Roads inundated') style_classes = [dict(label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict(label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5)] style_info = dict(target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector( data=line_layer, name=tr('Flooded roads'), keywords={'impact_summary': impact_summary, 'map_title': map_title, 'target_field': target_field}, style_info=style_info) self._impact = line_layer return line_layer
def run(self): """Run the impact function. :returns: A new line layer with inundated roads marked. :type: safe_layer """ self.validate() self.prepare() target_field = self.target_field # Get parameters from layer's keywords road_class_field = self.exposure.keyword('road_class_field') # Get parameters from IF parameter threshold_min = self.parameters['min threshold'].value threshold_max = self.parameters['max threshold'].value if threshold_min > threshold_max: message = tr( 'The minimal threshold is greater than the maximal specified ' 'threshold. Please check the values.') raise GetDataError(message) # reproject self.extent to the hazard projection hazard_crs = self.hazard.layer.crs() hazard_authid = hazard_crs.authid() if hazard_authid == 'EPSG:4326': viewport_extent = self.requested_extent else: geo_crs = QgsCoordinateReferenceSystem() geo_crs.createFromSrid(4326) viewport_extent = extent_to_geo_array( QgsRectangle(*self.requested_extent), geo_crs, hazard_crs) # Align raster extent and viewport # assuming they are both in the same projection raster_extent = self.hazard.layer.dataProvider().extent() clip_xmin = raster_extent.xMinimum() # clip_xmax = raster_extent.xMaximum() clip_ymin = raster_extent.yMinimum() # clip_ymax = raster_extent.yMaximum() if viewport_extent[0] > clip_xmin: clip_xmin = viewport_extent[0] if viewport_extent[1] > clip_ymin: clip_ymin = viewport_extent[1] # TODO: Why have these two clauses when they are not used? # Commenting out for now. # if viewport_extent[2] < clip_xmax: # clip_xmax = viewport_extent[2] # if viewport_extent[3] < clip_ymax: # clip_ymax = viewport_extent[3] height = ((viewport_extent[3] - viewport_extent[1]) / self.hazard.layer.rasterUnitsPerPixelY()) height = int(height) width = ((viewport_extent[2] - viewport_extent[0]) / self.hazard.layer.rasterUnitsPerPixelX()) width = int(width) raster_extent = self.hazard.layer.dataProvider().extent() xmin = raster_extent.xMinimum() xmax = raster_extent.xMaximum() ymin = raster_extent.yMinimum() ymax = raster_extent.yMaximum() x_delta = (xmax - xmin) / self.hazard.layer.width() x = xmin for i in range(self.hazard.layer.width()): if abs(x - clip_xmin) < x_delta: # We have found the aligned raster boundary break x += x_delta _ = i y_delta = (ymax - ymin) / self.hazard.layer.height() y = ymin for i in range(self.hazard.layer.width()): if abs(y - clip_ymin) < y_delta: # We have found the aligned raster boundary break y += y_delta clip_extent = [x, y, x + width * x_delta, y + height * y_delta] # Clip hazard raster small_raster = clip_raster( self.hazard.layer, width, height, QgsRectangle(*clip_extent)) # Create vector features from the flood raster # For each raster cell there is one rectangular polygon # Data also get spatially indexed for faster operation index, flood_cells_map = _raster_to_vector_cells( small_raster, threshold_min, threshold_max, self.exposure.layer.crs()) # Filter geometry and data using the extent ct = QgsCoordinateTransform( QgsCoordinateReferenceSystem("EPSG:4326"), self.exposure.layer.crs()) extent = ct.transformBoundingBox(QgsRectangle(*self.requested_extent)) request = QgsFeatureRequest() request.setFilterRect(extent) if len(flood_cells_map) == 0: message = tr( 'There are no objects in the hazard layer with "value" > %s. ' 'Please check the value or use other extent.' % ( threshold_min, )) raise GetDataError(message) # create template for the output layer line_layer_tmp = create_layer(self.exposure.layer) new_field = QgsField(target_field, QVariant.Int) line_layer_tmp.dataProvider().addAttributes([new_field]) line_layer_tmp.updateFields() # create empty output layer and load it filename = unique_filename(suffix='.shp') QgsVectorFileWriter.writeAsVectorFormat( line_layer_tmp, filename, "utf-8", None, "ESRI Shapefile") line_layer = QgsVectorLayer(filename, "flooded roads", "ogr") # Do the heavy work - for each road get flood polygon for that area and # do the intersection/difference to find out which parts are flooded _intersect_lines_with_vector_cells( self.exposure.layer, request, index, flood_cells_map, line_layer, target_field) target_field_index = line_layer.dataProvider().\ fieldNameIndex(target_field) # Generate simple impact report epsg = get_utm_epsg(self.requested_extent[0], self.requested_extent[1]) output_crs = QgsCoordinateReferenceSystem(epsg) transform = QgsCoordinateTransform( self.exposure.layer.crs(), output_crs) flooded_keyword = tr('Flooded in the threshold (m)') self.affected_road_categories = [flooded_keyword] self.affected_road_lengths = OrderedDict([ (flooded_keyword, {})]) self.road_lengths = OrderedDict() if line_layer.featureCount() < 1: raise ZeroImpactException() roads_data = line_layer.getFeatures() road_type_field_index = line_layer.fieldNameIndex(road_class_field) for road in roads_data: attributes = road.attributes() road_type = attributes[road_type_field_index] if road_type.__class__.__name__ == 'QPyNullVariant': road_type = tr('Other') geom = road.geometry() geom.transform(transform) length = geom.length() if road_type not in self.road_lengths: self.affected_road_lengths[flooded_keyword][road_type] = 0 self.road_lengths[road_type] = 0 self.road_lengths[road_type] += length if attributes[target_field_index] == 1: self.affected_road_lengths[ flooded_keyword][road_type] += length impact_summary = self.html_report() # For printing map purpose map_title = tr('Roads inundated') legend_title = tr('Road inundated status') style_classes = [ dict( label=tr('Not Inundated'), value=0, colour='#1EFC7C', transparency=0, size=0.5), dict( label=tr('Inundated'), value=1, colour='#F31A1C', transparency=0, size=0.5)] style_info = dict( target_field=target_field, style_classes=style_classes, style_type='categorizedSymbol') # Convert QgsVectorLayer to inasafe layer and return it line_layer = Vector( data=line_layer, name=tr('Flooded roads'), keywords={ 'impact_summary': impact_summary, 'map_title': map_title, 'legend_title': legend_title, 'target_field': target_field}, style_info=style_info) self._impact = line_layer return line_layer