Re: Difference between light-weight geometry types
Yes, there's a difference.
A collection (LWCOLLECTION) is just a bag'o'objects.
A compound curve (LWCOMPOUND) is a specific kind of linear object, one
defined by a set of linear primitives: LWLINE, a linear primitive made
by making linear interpolations between pairs of control vertices;
LWCIRCSTRING, a linear primitive made by making circular arc
interpolations between triples of control vertices. While a
LWCOLLECTION imposes no restrictions on its members, a LWCOMPOUND
expects its members to (a) be linear primitives (b) join up end-to-end
into a single linear object.
> is there any difference between LWCOLLECTION and LWCOMPOUND? Has the meaning
> changed since postgis 1.5 (when liblwgeom wasn't yet packaged) to liblwgeom
> Also, what does LWCIRCSTRING stand for? Is it a closed line string?
> Thanks a lot,
> postgis-users mailing list
> [hidden email] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users