[postgis-users] simplify
Paul Ramsey
pramsey at refractions.net
Thu Mar 1 14:09:08 PST 2007
The units for Simplify() are the units of the data, so yes, if you
Simplify() decimal degrees data, you'll want to supply a decimal degrees
tolerance.
That said, DO NOT use Simplify() on decimal degrees data unless you live
on the equator. The difference in scale horizontally and vertically in
more northerly areas will result in "odd" simplifications when in
decimal degrees.
Paul
Stephen Crawford wrote:
> One last question and I'll leave you all alone for the day :)
>
> If I want to generalize my data, I should simplify()? So if the data are in
> decimal degrees, then is the tolerance decimal degrees? Something like
> this?
>
> CREATE TABLE accipiter AS SELECT
> gid,engl_name,sci_name,origin,Simplify(the_geom,0.01) as the_geom
> FROM all_species
> WHERE family='Accipitridae';
--
Paul Ramsey
Refractions Research
http://www.refractions.net
pramsey at refractions.net
Phone: 250-383-3022
Cell: 250-885-0632
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