[postgis-users] Help finding information on creating a "Heat Map"

[Rob Tester]

I rolled my own package to do this in a couple of weeks, using Delaunay
triangulation and Voronoi diagrams to do the interpolation between points.
You can get a package at http://www.cgal.org to do the Voronoi and the
triangulation. I also wrote another extension to use a course grid created
by the Voronoi to create contouring of the data as well. You can call the
either function and get an ouput consisting of polys that can then be
shaded.



-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Woody
Woodring
Sent: Friday, August 24, 2007 8:38 AM
To: 'PostGIS Users Discussion'
Subject: RE: [postgis-users] Help finding information on creating a "Heat
Map"

 Thanks for the info, but I had looked at theses earlier.  They require that
I ship the data to them, which is out of the question due to size and
confidentiality agreements.  

I was looking to do the work in-house, more so that I could learn something
in the process.

Thanks,
Woody

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
volunteer at spatiallink.org
Sent: Thursday, August 23, 2007 5:01 PM
To: PostGIS Users Discussion
Subject: RE: [postgis-users] Help finding information on creating a "Heat
Map"

http://www.geoiq.com/
sincerely
siva

-------- Original Message --------
Subject: [postgis-users] Help finding information on creating a "Heat Map"
From: "Woody Woodring" <george.woodring at iglass.net>
Date: Thu, August 23, 2007 4:52 pm
To: <postgis-users at postgis.refractions.net>

I am looking for information/advice on creating a "surface theme layer"
or
"Heat map layer" on my map. 

I currently have my data stored as points in Postgres/Postgis database and
need to output as continuous color gradation layer on Google maps. My
current uninformed thinking is as follows:

1) Convert the point info into some other spatial representation in the
database
2) Use GeoServer to create a WMS layer using the new representation. 

Any advice would be greatly appreciated.

Woody

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