[OSGeo-Discuss] density maps

[miblon]

Hi there folks,

I am currently investigating the open source options for generating 
density maps. I currently have some php code that could form the bases 
to do this, but I would prefer to use more general available api's such 
as geotools if that would be possible.

 From a j2ee developers point of view; I am looking for functionality 
that I can feed with a dataset of irregular point(jts) geometry and that 
will generate a layer like the one shown here:

http://2.bp.blogspot.com/_ZSuJiQ9ztA8/SmIM9yD-tYI/AAAAAAAABlM/FOyoqcie7Cc/s1600-h/Shootings+heat+map+Baltimore+July+2009.jpg 


or

http://rbnhw.com/media/epp-ShakeProbability.jpg

preferably, the image should be georeferenced so it can be handled as 
wms, but the latter I can fix.

Any ideas or references on where to look would be great!

kind regards,

Milo van der Linden