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0001 The online version of this example can be found at
0002 https://techbase.kde.org/Marble/DisplayGeoDataGroundOverlay
0003 
0004 GeoDataGroundOverlay is the class used in Marble to implement the features
0005 of the GroundOverlay KML element. More precisely, an instance references
0006 an icon that gets displayed on top of a certain area on the globe and a
0007 LatLonBox (GeoDataLatLonBox in Marble) describing its exact surface.
0008 
0009 As in the tutorial for displaying placemarks, we will be using a
0010 GeoDataDocument as the containter for our overlay. The document is
0011 afterwards exposed to Marble by having it added to the GeoDataTreeModel.