[postgis-devel] Heatmaps with raster

Sandro Santilli strk at keybit.net
Wed Apr 24 03:29:45 PDT 2013

I'm looking at how to optimize the production of a "density map"
to avoid a table scan for each grid cell (which scales pretty bad).

The idea is to use a temporary raster as the state value and "print"
each scanned geometry over it, in a single table scan.

Can postgis raster be used for this approach ?

In other words, is there a function to rasterize a geometry against
an existing raster?


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