[postgis-users] Buffering a convexhull

[Brian Sanjeewa Rupasinghe]

I used the following query to make a buffer of 1m iutward to a convexull
created by union of a set of polygons. But it gives an error.Why?

SELECT ST_As_Text(ST_Buffer (foo.the_geom, 1)) from (select
(ST_ConvexHull(ST_Union(the_geom))) from building_poly) As foo;

Sanjjewa
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