On Apr 27, 8:41 pm, Richard <[email protected]> wrote: > 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.
Easy method: make your polygons of a specific opacity (say 0.1). Overlapping polygons add their opacities, so where you have five together you will have a darker area. It's not easy to see more than ten different graduations -- in fact differentiating between one and two overlapping may not be easy -- so I wouldn't go for less than 0.1 for each polygon. Andrew --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
