[postgis-users] functions for polygon clipping and linear interpolation of linestrings by an external variable

[David Kaplan]

Hi,

I have placed a small amount of postgis code online for generating
linestring grids, clipping polygons by linestrings and linearly
interpolating linestrings (e.g., you have a linestring that represents
positions at a set of times that you want to interpolate so that the
intervals between positions is uniform).  

http://www.crh-eme.ird.fr/team/dkaplan/notes/postgis/index.html

The code is in pure SQL and PL/PGSQL, so it should be usable by most.
There is definitely lots of room for improvement and I haven't been
following postgis 2.0 particularly closely, so perhaps some of this
functionality exists already.  But it still seems like a useful bit of
code.  Comments and improvements welcome.

Cheers,
David

-- 
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David M. Kaplan
Charge de Recherche 1

Institut de Recherche pour le Developpement
UMR 212 Ecosystemes Marins Exploites
av. Jean Monnet
B.P. 171
34203 Sete cedex
France

Phone: +33 (0)4 99 57 32 27
Fax: +33 (0)4 99 57 32 95

http://www.umr-eme.org/team/dkaplan/
http://www.amped.ird.fr/
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