Thematic Mapping Engine for generating thematic prism / choropleth / bar / proportional symbol KMZ files, has just announced the first version of his— Planet Geospatial
Many cartographers advise the use of 5-7 classes for choropleth maps.— Recently Uploaded Slideshows
The following series of county-level choropleth maps, which reveals the distribution of many of these groups, draws on this resource.— doggdot.us
So far you'll find KML choropleth examples for Google Earth.— Slashgeo
(links added) There are choropleth maps, which is why I'm mentioning it.— Planet Geospatial

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