[postgis-users] AddGeometryColumn dimension property

[Nicolas Ribot]

> Brent Wood wrote:
> > It's the number of coordinates at each vertex. Typically 2 for XY data, but
> > three for XYZ data.
>
> ah, so a POINT does not necessarily have just two coordinates, but can
> be a point in any dimensional space?  I get it now, thanks Brent.
>

Not any dimensional space, but 2D, 3D, with optional measure
associated to the point.
Called 3DZ, 3DM and 4D in postgis manual

> btw, is there a (concise) reference list of the geometrical data types?
>   I don't seem to be able to find one via google.

Here:
http://postgis.refractions.net/docs/ch04.html#RefObject

Nicolas