What do you need to know about pyqgis documentation?
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. Modifying Vector Layers 6.5. Using Spatial Index 6.6. The QgsVectorLayerUtils class 6.7.
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
Which is the entry point in the QGIS documentation?
QgsAuthManager the entry point 14.4. Adapt plugins to use Authentication infrastructure 14.5. Authentication GUIs 15. Tasks – doing heavy work in the background 15.1. Introduction
What do you mean by virtual layers in QGIS?
A special kind of vector layer allows you to define a layer as the result of an advanced query, using the SQL language on any number of other vector layers that QGIS is able to open. These layers are called virtual layers: they do not carry data by themselves and can be seen as views to other layers.
What can be used in a virtual layer query?
The underlying engine uses SQLite and Spatialite to operate. It means you can use all of the SQL your local installation of SQLite understands. Functions from SQLite and spatial functions from Spatialite can also be used in a virtual layer query.
Which is the generic container for geometry in QGIS?
A geometry is the spatial representation of a feature. Since QGIS 2.10, QgsGeometry acts as a generic container for geometry objects. QgsGeometry is implicitly shared, so making copies of geometries is inexpensive. The geometry container class can also be stored inside a QVariant object.
How to run Python code when QGIS starts?
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.