[geos-devel] Dimension of EMPTY geoms

[Mateusz Loskot]

Markus Schaber wrote:
> Hi, Mateusz,
> 
> Mateusz Loskot wrote:
>> AFAIK OGC SFS does say nothing about how to report dimension of empty
>> geometry.
>>
>> OGC SFS reserves values 0, 1, and 2 for dimensions of non-empty
>> geometry, so I'd suggest to use negative value.
> 
> Don't confuse OGC dimension (geometrical dimensionality of the described
> object, Points have 0, LineStrings have 1, and Polygons have 2) and
> coordinate dimension (number of ordinates per vertex, which can be 2,3
> or 4 in PostGIS).

Markus,

You are perfectly right! Sorry, I've read the message too fast.

Cheers
-- 
Mateusz Loskot
http://mateusz.loskot.net