[postgis-users] Convex Hull with a certain "offset"

[Alex Mayrhofer]

Stefano Bonnin wrote:
> I'd like to find a convex hull "a little bit bigger". Is there a way to 
> add a certain offset to the polygon
> obtained from the convex hull query (like ST_expand for bounding boxes)

Applying ST_Buffer() to the output of your query should do exactly what 
you are looking for. See a practical application of the buffer function 
in the map at http://timatio.com/traces/19069-sll-brandstadl

Alex
http://timatio.com/