This is pretty cool! However, I'm going to put on my Edward Tufte hat and point out that it's probably best to serve up this data in a static table. It always disappoints me to see sparse, categorical data visualized on a map since there's no additional context one achieves from the geospatial components. OP: maybe you could explore visualizing continuous fields, such as the Earth gravity field: http://www.csr.utexas.edu/grace/gallery/gravity/ggm01_asia_f...