Major Description
The QuadTreeNode has the concept of a data container per node in the QTree, but I'd like to extend this to a general SIS spatial data type. This would in part be motivated by e.g., [1], where the suggestion is something like:
Any measurement we take in Earth and environmental sciences, although this is often ignored, has a spatio-temporal reference. A spatio-temporal reference is determined by (at least) four parameters:
1. geographic location (longitude and latitude or projected X,Y coordinates);
2. height above the ground surface (elevation);
3. time of measurement (year, month, day, hour, minute etc.);
4. spatio-temporal support (size of the blocks of material associated with measurements; time interval of measurement);
[1] http://www.lulu.com/items/volume_67/8010000/8010854/5/print/Hengl_2009_GEOSTATe2c1_f.pdf