Try ST_Perimeter() for areal geometries.
Fred
On Fri, Apr 23, 2010 at 6:45 PM, Andrea Peri 2007 <aperi2...@gmail.com>wrote:
> Hi,
>
> using this polygon:
> MULTIPOLYGON(((1 1, 2 3, 10 10, 1 1)))
>
> The Length return is zero.
>
> Perhaps I'm forget something ?
>
> This is my simply sql code.
>
> create table _uno (id serial primary key);
> SELECT AddGeometryColumn('_uno', 'geom', 3003, 'MULTIPOLYGON', 2);
> insert into _uno (geom) values (ST_GeomFromText('MULTIPOLYGON(((1 1, 2 3,
> 10 10, 1 1)))',3003));
> select st_length(geom) from _uno
>
> -------
> 0
>
> I'm using Postgres 8.4.3 - Postgis 1.5.1 on windows 7 - 64 bit.
>
> Thx,
>
> Andrea Peri.
>
>
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