For further mappings of big multidimensional datasets (datacubes) to heatmaps: http://vis.stanford.edu/projects/immens/ http://vis.stanford.edu/projects/immens/

For further mappings of big multidimensional datasets (datacubes) to heatmaps: http://vis.stanford.edu/projects/immens/ http://vis.stanford.edu/projects/immens/ , http://www.nanocubes.net/ http://www.nanocubes.net/, and http://www.mapd.com/ http://www.mapd.com/ . I'm not as familiar with the GIS space, but suspect a bunch there too.