[postgis-users] Re: Help with finding multi-variate clusters

[Josh@oklieb]

You may not fuss about the algorithm, but this happens to be  
something that geostatistics handles rather well and sql hacks not  
well at  all. In particular, it gives you no idea of the strength of  
the clustering.

There has been work done on OGC web processing services (WPS) which  
can place algorithms from something like R or GRASS in front of or  
behind a WFS. A back-end approach might be to write a postgresql  
procedure. If all else fails, try desktop GIS...

Josh Lieberman

On Jul 13, 2005, at 9:57 AM, Eli Dylan Lorimer wrote:

> Hi Stephen,
>
> Thanks for your reply. I might look into writing that function as  
> you suggested, but I feel slightly limited in that I'm making the  
> SQL requests in the form of a WFS request to GeoServer which in  
> turn is speaking to PostGIS and so I'm not sure if I can add my own  
> functions and then have my WFS requests trigger them. I'll have to  
> look into this and figure it out.
>
> I see what you are saying, it being an iterative algorithm and not  
> really suited for set operations as such. Hum, I still feel like  
> with the spatial operators there must be a way to get what I'm  
> looking for, even if I have to make multiple WFS requests or  
> something.
>
> Maybe someone else on this list might know of a way to do this?
>
> Anyway, cheers.
> ./dylan
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