Contents
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 start a QGIS project in Python?
Python Plugins 1.3. Running Python code when QGIS starts 1.4. Python Applications 1.5. Technical notes on PyQt and SIP 2. Loading Projects 2.1. Resolving bad paths 3. Loading Layers 3.1. Vector Layers 3.2. Raster Layers 3.3. QgsProject instance 4. Accessing the Table Of Contents (TOC) 4.1. The QgsProject class 4.2. QgsLayerTreeGroup class 5.
How to create a vector layer in pyqgis?
Selecting features 6.4. Modifying Vector Layers 6.5. Using Spatial Index 6.6. The QgsVectorLayerUtils class 6.7. Creating Vector Layers
What do you need to know about pyqgis development?
Raster Layers 3.3. QgsProject instance 4. Accessing the Table Of Contents (TOC) 4.1. The QgsProject class 4.2. QgsLayerTreeGroup class 5. Using Raster Layers 5.1. Layer Details 5.2. Renderer 5.3. Query Values 6. Using Vector Layers 6.1. Retrieving information about attributes 6.2. Iterating over Vector Layer 6.3. Selecting features 6.4.
How do you remove a layer in QGIS?
Layers can be removed by the user in the QGIS interface, or via Python using the removeMapLayer () method. Adding a layer to the current project is done using the addMapLayer () method:
How to create a vector layer in QGIS?
To create and add a vector layer instance to the project, specify the layer’s data source identifier, name for the layer and provider’s name: The data source identifier is a string and it is specific to each vector data provider. Layer’s name is used in the layer list widget. It is important to check whether the layer has been loaded successfully.
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 move layers in the layer order panel using pyqgis?
To automatically move newly added layers to the top of Layer Order Panel, you could use the legendLayersAdded SIGNAL (this signal is appropriate because it’s emitted after the Layer Order Panel gets the new layer) from QgsMapLayerRegistry and reorder layers in this way:
Is there an error trying to play QGIS Python?
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How to set layer order in layer order panel?
You can set layer order in the Layer Order Panel ” manually ” using QgsLayerTreeCanvasBridge.setCustomLayerOrder () method, which receives an ordered list of layer ids. For instance (assuming you just loaded vlayer ):
How to load a layer in QGIS using Python?
The first operation is to select the Python Console from the Plugins menu: Then, if you have to load a Vector layer: If you have to load a Raster layer: Note If you are working on a Python script, be sure to import the following row before anyone of the codes written above:
How to create a layer tree group in QGIS?
Layer tree group node serves as a container for layers and further groups. Group names do not need to be unique within one tree nor within one parent. Append an existing node. Append a new group node with given name. Append a new layer node for given map layer.
Do you need a unique name for a group in QGIS?
Group names do not need to be unique within one tree nor within one parent. Append an existing node. Append a new group node with given name. Append a new layer node for given map layer. Returns a clone of the group. Returns text representation of the tree.
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