Has anyone done a mashup where overlapping polygons have been used to display a density map. Consider the following: 200 polygons some of which over lap. Where two overlap the overlap would be a different color, where three overlap, a different color and so on. I would like to use such a mashup to measure the density of a number of species in a specific range. I realize that a GIS system would produce this, but if there is one that would produce a google map this would be marvelous. I have individual polygons of separate species, but would like to know where the highest density of all of them would be.I literally have hundreds of these individual species maps so there would need to be some sort of processing the info to break the groups into layers of ten species.
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