[postgis-users] Surface maps from point interpolation

[Josh Livni]

Not exactly sure what you specifically mean by 'surface map', but 
assuming it's raster based, you'll need to step outside of PostGIS to 
create it. 

You may be interested in this response from Bill Binko to a tangential 
question I had some time ago:  
http://postgis.refractions.net/pipermail/postgis-users/2006-March/011427.html

  -Josh

Stephen Crawford wrote:
> I have a postGIS db with millions of point observations.  Is there a way in
> postGIS to make surface maps from a subset of these points? In a perfect
> world I would like to be able to have a web user select the subset--like
> 'species x for time period y' and make an interpolated surface map.  Can
> this be done in postGIS?  And also can it be done fast enough to be 'on the
> fly'?
>
> Thanks,
> Steve
>
> Stephen Crawford
> Center for Environmental Informatics
> The Pennsylvania State University
>
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