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.

On Sep 20, 3:58 am, Trevor Seaman <[email protected]> wrote:
> Have a look at Google fusion tables
> You can build them there if you have the data
>
>
>
>
>
>
>
> On Tue, Sep 20, 2011 at 9:11 AM, Olivier Salmon <[email protected]> wrote:
> > 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
>
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