[postgis-users] ST_Buffer returning multipolygons

[Francois Hugues]

Hello,

If your input is a multipolygon, st_buffer may return a multipolygon
since your buffered the buffered polygons which compose your
multigeometry may not intersect each other.

Hugues. 





-----Original Message-----
From: postgis-users-bounces at lists.osgeo.org
[mailto:postgis-users-bounces at lists.osgeo.org] On Behalf Of marquz74
Sent: Friday, January 18, 2013 12:41 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] ST_Buffer returning multipolygons

Hi to all,
I'm practicing with ST_buffer on North Carolina Dataset (nc_spm_08). 
By running the following query:

SELECT GeometryType(sub.buffer)
FROM (  
        SELECT st_buffer (the_geom, 100) AS buffer 
        FROM streams
) AS sub
WHERE
        GeometryType(sub.buffer)  <> 'POLYGON';

I've been getting some MULTIPOLYGON records. 
Is it possible? I guessed ST_Buffer could return POLYGON geometries
only...
was I wrong?

Thanks in advance.

Marco



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