[postgis-users] SRID for analyzing a USA national data set in Meters
Jeremy Dunck
jdunck at gmail.com
Mon Apr 2 13:55:18 PDT 2007
On 4/2/07, David William Bitner <david.bitner at gmail.com> wrote:
> CREATE OR REPLACE FUNCTION utmzone(geometry)
...
> LANGUAGE 'plpgsql' VOLATILE;
This function is guaranteed to return the same result as long as
spatial_ref_sys doesn't change, and so could be classified as:
LANGUAGE 'plpgsql' IMMUTABLE;
for better performance.
Cheers,
Jeremy
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