[postgis-users] Spatial joins in raster?

[Paul Ramsey]

GRASS? That leaps out as the obvious choice, and has been used for alot 
of different environmental analysis problems.

P

Steve Stanton wrote:

> I'm new to postgis, looking for software to do efficient
> spatial joins on multiple tables (where each row corresponds
> to a polygon).
> 
> I tried using the JTS MultiPolygon.intersect method to
> dumbly compare a couple of shape files (compared each
> polygon in file#1 to every polygon in file#2), and it was
> a bit too slow (I threw in an initial envelope overlap
> check on each polygon overlay, which made it run about
> 12x faster, but that's still too slow.)
> 
> Is there any software out there that does spatial joins
> in raster? I'm playing with environmental analysis, don't
> need the precision of a vector overlay, and don't mind
> holding raster representations off to one side. Any
> suggestions would be appreciated.
> 
> Steve Stanton

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      | Paul Ramsey
      | Refractions Research
      | Email: pramsey at refractions.net
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