I have a long list of GeoHash codes for a certain geographic region. I'm using 6-character precision so for example if the area under study was Earl's Court in London, I would have a few six letter codes that for that region.
What I want to do is to be able to generate heat maps using this information. Specifically I want to colour a set of codes based on a certain condition.
I have searched but the only thing I have seen is the GeoHash query page (http://geohash.org/c216ne), but that just returns a marker to the a specific position, not the area.
Are there any tools for generating a heat map with this geoHash Information?