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Geographical Heat Map

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Veign:
Anyone know of anything around that lets me create, and manage, a heat map of the world.  Its has to be an online solution that I can host locally on a web server - Google Map solution preferred.

The way I see it working is the map, or code, makes calls (Ajax) to the database to retrieve values for a square being viewed and displays a heat map overlay on the view.  Some initial settings determine values corresponding to colors.

Anyone know of anything around?

edited: Should note that this is for a PHP / MySQL project.

tinjaw:
My list of things bookmarked "for future study" on this topic are...

gheat - Project Hosting on Google Code
HeatMapAPI.com - Home
Density Mapping in Google Maps with HeatMapAPI « GeoChalkboard
Create a Heat Map with Your Own Data (& Embed on Your Site!)

Veign:
Those are the same ones I've come acroos.
HeatMapAPI looks great but costs a fortune and not possible for a high traffic website. 
gHeat is in Python - not something I've dealt with before and time is not on my side to learn.
http://imagine-it.org/google/geoiqmap.html - Doesn't work anymore and references HeatMapAPI
And the last references HeatMapAPI.

Hard to believe that HeatMapAPI is the only option, that no one else has done this before.

Veign:
Found this guy:
http://maps.forum.nu/

Looks promising.

tinjaw:
Doh! How'd I miss that. I have that in my bookmarks.

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