Processing.initialize()importprocessing# 2. 加载数据data_source=r"XX.shp"data_output=r"XX.shp"image_output=r"XX.png"fileInfo=QFileInfo(data_source)iffileInfo.exists():print("File exists; Path is correct")dlr_layer=QgsVectorLayer(data_source,"dlr_layer","ogr")ifnotdlr_layer.isValid():...
Today, we’ll take the next step and add basemaps to our maps. This is trickier than I would have expected. In particular, I was fighting with “invalid” OSM tile layers until I realized that my QGIS application instance somehow lacked the “WMS” provider. ...
= -1 Fix for PostGIS LINESTRING rendering Database Connections can now be deleted Fixes to Database Connection dialog Fix for crash when opening a shapefile attribute table twice in succession Fix for crash when opening invalid shapefiles Version 0.0.10-alpha May 13, 2003 *Fixes to project ...
Yes, you can execute SQL queries in the Python Console by using the appropriate PyQGIS functions and classes. This often involves creating a database connection (usingQgsDataSourceUriandQgsVectorLayerfor example), and then executing SQL commands using that connection. It’s a powerful way to int...
cbd.shp zoning_cbd.shp split_zoning_cbd.shp Procedure Open QGIS. Click Open Data Source Manager icon to add layers to work on for the tutorial. Switch to the Vector tab and use the browsing button to navigate to the folder where you have kept the processed shapefiles. Select cbd.shp, ...
When working with vector data layers, you may encounter geometry errors. These errors often become part of your data after running geoprocessing, digitizing, editing or data conversion. QGIS3 comes with build-in tools and algorithms to detect and fix invalid geometries. This tutorial will show you...
def processAlgorithm(self, parameters, context, feedback): source = self.parameterAsSource(parameters, self.INPUT, context) if source is None: raise QgsProcessingException( self.invalidSourceError(parameters, self.INPUT)) join_source = self.parameterAsSource(parameters, self.JOIN, context) if ...
# invalid f3 = QgsFeature(3) f3.setAttributes(["c"]) f3.setGeometry( QgsGeometry.fromWkt('Polygon((0 0, 1 0, 1 1, 0 1, 0 0))')) # valid self.assertTrue(pr.addFeatures([f1, f2, f3])) res = [ f['x'] for f in layer.getFeatures(QgsFeatureRequest( ).setInvalidGeometr...
Digitizing: Edit Invalid Attributes on Copy/Paste to Another Layer Digitizing: Snapping cache parallelization Data Management: DXF Export Improvements Forms and Widgets: Create geometric feature from the relation editor Forms and Widgets: Improve feature selection dialog Analysis Tools: Smooth Export of th...
CBSA data: cb_2018_us_cbsa_5m.shp Ballpark data: 2019-mlb-ballparks.geojsonhub_layer_name = "2019-mlb-ballparks.geojson" hub_layer = QgsVectorLayer(hub_layer_name) hub_name_field = "Team" spoke_layer_name = "cb_2018_us_cbsa_5m.shp" spoke_layer = QgsVectorLayer(spoke_layer_name...