[postgis-users] ST_Clip

[Paolo Cavallini]

Hi all.
I may well be tired, but I cannot understand why:

CREATE TABLE clip2
  AS SELECT rid, ST_Clip(rast, 1,ST_Buffer(ST_Centroid(ST_Envelope
(rast)),5000))
  AS rast from hdr            
 WHERE rid = 4;

does not result in a circle, but in a square, contained in the buffer
but smaller.
See attached pictures, with the buffer in green, and the clipped raster
inside.

Any hint?
Thanks.

-- 
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario

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