[postgis-users] curves geometries and topology

[Rémi Cura]

2014-04-15 16:58 GMT+02:00 Sandro Santilli <strk at keybit.net>:

> On Tue, Apr 15, 2014 at 04:40:34PM +0200, Reijer Copier wrote:
> > Thanks!
> >
> > We are currently considering using PostGIS Topology only to maintain
> > a topology aware copy of the data (to be used for analyses where
> > topology matters) and use the original geometry (containing circular
> > strings) when we have to (re)generate output geometry.
> >
> > BTW: Is cgal/sfcgal going to replace geos eventually? It would be
> > great if this limitation (= curved geometries being a second class
> > citizen) was somehow lifted in future versions PostGIS.
>
> It could be, once it gets to support everything currently supported
> by the GEOS backend and proves to be better maintained :)
>
> --strk;
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Huhu you are touching a sensitive point.
Mostly GEOS and CGAL don't share the same purpose,
so it is unfair to compare them.

If you are going to need precise computation on abstract type,
you want a math lib (cgal). If you are doing approximate computation
because your data is not precise anyway,
GEOS is fast and reliable.


That being said, PostGis Topology uses neither CGAL or GEOS, and that could
improve greatly performance and add functions.
This is an open topic.

Cheers,
Rémi-C
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