How to remove a vector layer from QGIS?

How to remove a vector layer from QGIS?

The solution, provided by @andytilia, involves using the following command for versions of QGIS from 1.8 to 2.99. The solution involves using the following command for QGIS 3.X. Not the answer you’re looking for?

How to load a vector layer in pyqgis?

You can find a list of all functions in the official PyQGIS documentation . You’ll see that addVectorLayer is listed in the documentation as a method belonging to iface with the following description: addVectorLayer(self , vectorLayerPath: str , baseName: str , providerKey: str) → QgsVectorLayer

How to open a vector layer in Python?

Opening a vector layer, such as a the countries dataset contained in the Natural Earth geopackage, using the GUI is as simple as double-clicking it in the data source manager or drag-and-dropping it into the map window: If we want to do the same thing using Python, we need to know the exact source of the layer data.

Where to find country layer name in pyqgis?

This information can be found in the layer properties. Note how the source contains the path to the geopackage as well as information about the country layer’s layer name: If you are not using QGIS 3 yet, the above dialog will look different but it contains the same information.

How to add and delete fields in pyqgis?

Before deleting fields you may want to loop through the existing fields and print field names to the console. This can be done as follows. The output will be field names. We delete fields in a very similar way to adding fields. First check the layer capabilities, delete fields, and update fields.

How to add and remove fields from a vector layer?

We delete fields in a very similar way to adding fields. First check the layer capabilities, delete fields, and update fields. This example shows deletion of two fields by the field index. Add and remove fields from a vector layer.

How to assign shapefile to variable layer in QGIS?

We’ll load a shapefile in the QGIS interface and assign it to the variable layer with the following code. Now we’ll get the layer capabilities. This will allow us to make sure we can add and delete fields of the layer. This is done by calling capabilities () on the layer’s data provider.

How to add a layer to a QGIS TOC?

Using the new Layer tree (introduced since QGIS v.2.4 and available for QGIS v3.x) you can add a group to the QGIS ToC this way: You can learn more on Layer tree handling here and here.

How to create a layer group in Python?

Closed 2 years ago. How can I create a new group in the layer manager using python code? Using the new Layer tree (introduced since QGIS v.2.4 and available for QGIS v3.x) you can add a group to the QGIS ToC this way:

How to remove all layers * except * some specific ones?

How to remove all layers *except* some specific ones in pyqgis? I need to load several vector layers for my QGIS project, so that I test every function of my script in every one of them. However, in the end I want to work only with one or two layers of interest and discard the others, so I would like to do that automatically.

How do you perform table joins in QGIS?

Create the table join. Table joins in QGIS are performed using QgsVectorJoinInfo object. We need to specify the GEO.id2 field from the CSV layer as the Join Field and the GEOID field from the shapefile layer as the Target Field. Once you run the following code, the shapefile layer will have additional attributes joined from the csv layer.

How to load zipped layers in QGIS using Python?

Loading zipped layers in QGIS via Python. Using QgsGraduatedSymbolRendererV2 to apply a graduated style to a vector layer. Download the following files to your computer. You can type the following commands in the Python Console or the built-in Editor in QGIS. Load the shapefile. The Census Tracts file is a zip file containing the shapefile.

How to get layer information in QGIS interface?

You can type directly into the console, or select the pad and paper icon to write code in the editor. I prefer to write code in the editor because it allows me to save my work and run a compilation of commands. The simplest way to get layer information from layers in the QGIS interface is to use the layer name.

How to iterate over layers in pyqgis Python?

Then you can iterate over layers like: Because .mapLayers () returns a dictionary ( dict ), you can also use .values () method of dictionary which returns just a list which contains layers in that case. Then you can iterate over layers like: Note: After grouping I have to remove the duplicate layer so I used root.removeLayer (lyr).

Can a qgisinterface be used as a plugin?

QgisInterface Abstract base class defining interfaces exposed by QgisApp and made available to plugins. Only functionality exposed by QgisInterface can be used in plugins. This interface has to be implemented with application specific details.