lineVecLayer = QgsVectorLayer("LineString", layername,"memory") lineProvider = lineVecLayer.dataProvider() lineProvider.addAttributes( [ QgsField("seq", QVariant.Int),QgsField("name", QVariant.String)] ) lineVecLayer.startEditing()print("editing layer:%s..."% (layername)) points = [QgsPo...
1. New GeoPackage Layer 2. 选择上一步创建的.gpkg 3. 矢量类型选择line 4. 增添Filed: name: name; type: text. 注意要点击Add to filed lists才能真正增添filed 5. Ok 6. 选择Add New Layer 在已有的database中(.gpkg)创建一个新图层(river) 切换到编辑模式,增添Line,注意河流流向是从上游到下游。支...
ff.baseName());zoomToFirstLayer<QgsVectorLayer*>();constQStringid="native:clip";...
工具栏Layer->Add Layer->Add Delimited Text Layer ③红色箭头处选择csv文件 ④选择文件后,程序会自动选择一些设置, file format文件格式,红色框中的X轴对应经度,Y轴对应纬度,因为文件中有这两个字段,所以可以自动匹配上,如果没有可以选择下拉框,手动指定。椭圆框中为地理坐标系。 sample data可以看一下数据的预览。
layer = QgsVectorLayer('path/to/shapefile.shp', 'layer_name', 'ogr') if layer.isValid(): QgsProject.instance().addMapLayer(layer) 2.获取图层属性: python provider = layer.dataProvider() fields = provider.fields() for field in fields: print(field.name(), field.typeName()) 3.创建新图层...
Go to the Raster menu > Projections > Warp (Reprojects)..., then click the Run as Batch Process... button at the bottom of the window. In the Input layer column, click Autofill... > Select Files... (or Add All Files from a Directory... depending on what you plan on doing, jus...
我们通过点击工具栏中的Add WMS Layer button 来加载WMS图层,类似加载SpatiaLite数据库图层,图层数据是存储在数据库中的,为了使用这些图层,我们首先要连接这些数据库。而添加WMS图层,需要先连接远程服务器。 点NEW 按钮 创建一个新的WMS连接,首先需要一个WMS 服务地址 ,互联网上有许多免费的WMS 服务,例如: terrestri...
Don't try to install OWSLib on mingw builds Jun 15, 2022 postinstall use cmake native FindPython (qgis#42497) Mar 29, 2021 python Add QgsProviderRegistry.providersForLayerType method to list all prov… Jun 15, 2022 resources Drop gpkg_metadata_reference_column_name_update trigger generated by...
Switch to the Display tab. Here you can enter any text that will be displayed when you hover over the features of the layer. Even better, you can use layer field values and expressions to define a much more useful message. Click on theƐbutton. ...
provider.addFeatures(features) RuntimeError: wrapped C/C++ object of type QgsVectorDataProvider has been deleted I'm not sure how it is possible for the data provider object to get deleted before the end of the function. I hold a proper reference to it and the layer. And each job gets ...