[postgis-users] Corner coordinates from Geometry

[Paul Ramsey]

Ah, POINT(avg(X), avg(Y))...

On Tue, Nov 24, 2009 at 9:38 AM, Kevin Neufeld <kneufeld at refractions.net> wrote:
> Maxime van Noppen wrote:
>>
>> Paul Ramsey wrote:
>>>
>>> Use ST_Centroid() then. It's just the mid-point of the bbox, so it's
>>> fast to calculate.
>>
>> It might be outside the polygon though.
>>
>
> In which case, if it matters, use ST_PointOnSurface().
>
> Paul, just a clarification, I believe centroid calculates the geometric
> centre of a geoemtry or "centre of mass" and not the mid-point of the bbox.
>  Here are a few pictorial examples:
> http://postgis.org/documentation/manual-1.5SVN/ST_Centroid.html
>
> -- Kevin
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