Graphics Reference
In-Depth Information
Note that you aren't limited to using memory layers to represent actual geospatial data.
You could just as easily use the memory layer to display information that doesn't represent
a location. For example, you can use a memory layer to draw arrows onto a map, or to
shade certain areas of the map using a semi-transparent polygon. Memory-based map lay-
ers are an extremely powerful tool, and one that you will often use when writing your own
programs based on QGIS.
