This: http://en.wikipedia.org/wiki/Thematic_map
For an example of a real life interactive one, here's one I created as part of the practicum for my GIS diploma: http://wells.viu.ca/vicgmn/
Yes, I want to know about those orc population densities.
No, the voices in my head say they have nothing to do with psi.
This: http://en.wikipedia.org/wiki/Thematic_map
For an example of a real life interactive one, here's one I created as part of the practicum for my GIS diploma: http://wells.viu.ca/vicgmn/