HeatMap ...

[Olivier Salmon]

Hello all,

Does anyone know how those kind of maps are made: http://www.zoopla.co.uk/heatmaps/ ?

Are they pre-build? and if yes ... how ?

Any help / tips / information will be more than welcome !

Cheers

[DiTieM]

It looks to me like they are using Google Maps with a FusionTablesLayer (shown as a heatmap).

The maps are not prebuilt. A server (from Google) computes them in real time and send the images

to the client (browser) that  draws them on the top of the map.

I hope it helps!

[Trevor Seaman]

Have a look at Google fusion tables
You can build them there if you have the data

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[Albert Sun]

While you could build a heatmap with Google Fusion Tables, that
particular map doesn't use Fusion Tables. They've rendered their own
set of tiles which match the base tiles and are hosting them
themselves ( one here http://www.zoopla.co.uk/static/images/maps/heatmaps/6/31_22.png
for example)

For each zoom level you render a 256x256 png with the color shading
and that gets overlaid the map. There are some tools that can make it
easier. http://code.google.com/p/gheat/ is one of them.