[postgis-users] How to get the centroid of an bounding box using st_extent

[Charlie Savage]

Paul,
> 
> Hmmm... for an linear envelope would returning a linestring not make 
> more sense?

That does raise another question.

select astext(envelope('LINESTRING(0 0, 0 10)'))

"POLYGON((0 0,0 10,0 10,0 0,0 0))"

select valid(envelope('LINESTRING(0 0, 0 10)'))

false

Should envelope should do the same?  What does JTS/GEOS do in this case?

Charlie
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