[postgis-users] linking 2 topogeometries of different nature

[Rémi Cura]

Hello Sandro,

I'll surely do things the way you suggest, I realize it is what makes the
most sense for me.

Thanks for the quick answer !

Cheers,

Rémi-C


2013/10/22 Sandro Santilli <strk at keybit.net>

> On Tue, Oct 22, 2013 at 01:51:53PM +0200, Rémi Cura wrote:
> > Hey dear List,
> > (and hey Sandro ;-) )
> >
> > somebody knows if there is a mechanism to make explicit link between 2
> > topogeoms of different type (lineal and puntal)?.
> > For instance in a road network with topogeom "road" and topogeom
> > "road_intersection", I would like to link the "road_intersection" to all
> > incoming/outcoming "road".
> >
> > I was thinking of using classical relations (foregin key etc), but maybe
> > there is something I don't understand.
> >
> > I'm going to do this a lot so I would appreciate suggestions making it
> > compatible with current postgis_topology functionning.
>
> The TopoGeometry type was created mostly to let people deal with them
> the way they used to deal with Geometry objects, so you can use classical
> relations.
>
> BUT if you get down one level you can use GetNodeEdges against a node
> associated
> with a "road_intersection" value to obtain a list of edge identifiers, and
> then
> go back up to find linear TopoGeometry objects whose definition include
> those
> edge identifiers. Those relations are already there, it's only your choice
> to
> use them.
>
> --strk;
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