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Mastering QGIS by GISP Dr. John Van Hoesen, GISP Dr. Richard Smith Jr., GISP Kurt Menke, Dr. Luigi Pirelli

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Vector structure

The QgsVectorLayer class is more complex that its raster equivalent. To describe it, we will first approach basic layer parameters and then we will explore how the vector is organized. We will explore some classes that are involved in the vector structure that represent rows and headers.

The basic vector methods

We will explore the vector class working on a real vector; we will load alaska.shp in the myVector variable.

This variable is an instance of the QgsVectorLayer class. This means that all methods of the vector are documented at http://qgis.org/api/classQgsVectorLayer.html. As for rasters, this class is a specialization of the generic QgsMapLayer class.

To get the extent of the layer, it's necessary to use the extent() method ...

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