[GRASSLIST:7734] operations on subsets of data in database

[Jason Horn]

I figured out how to set up attribute data for a point layer in a  
mysql database.  Very handy because I can now select points for  
display based on attributes (population > n, type like "whatever",  
etc.)  However, now I want to perform operations on those data based  
on the same select criteria.  For example, I want to create buffer  
vector layer from just some of the points in that point layer.  There  
does not appear to be any way to do this in GRASS.   I would have to  
create a copy of the layer or a new layer that contains a subset of  
the points.  This seems like such a obviously useful feature that if  
there is no way to currently do this, I'd like to suggest that it be  
considered in GRASS's development.  After all, what's point in having  
the wonderful capability of selecting geometry with a database query  
if all you can do with it is display it?

Just my 2 cents.


Jason Horn
Boston University Department of Biology
5 Cumington Street  Boston, MA 02215

jhorn at bu.edu
office: 617 353 6987
cell: 401 588 2766


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