[postgis-users] [postgis-devel] linking 2 topogeometries of different nature

[Rémi Cura]

I'm sorry for being so disorganized,
I lack experience with postgis_topology.

It is only the 3d function I write for it.

I was supposing you would need the layer_id in case there are multiple
topogeom columns in one table.

Still I don't see a use case for having multiple topogeom columns in the
same table, even if I do use multiple geom columns for one table sometimes.

I totally agree with your others conclusions and proposed signature
SET OF topogeometry GetRelatedLineal(
           a_source_lineal_topogeom TOPOGEOMETRY,
           a_target_puntal_topogeom_layer_id INT )

I'm going to try to do first : get line from point, get point from line,
but of course this all should be one function.
GetRelated, working for any combination :

ANY[puntal,lineal,areal] related to ANY[puntal,lineal,areal]


I don't like to put layer_id directly as input in function because it is
not a number user fixed.

I think I can live with that as I wrote a function to get layer id from the
topogeom name :
public.rc_getlayerid(layer_name text, layer_schema text DEFAULT ''::text)

Cheers,
Rémi-C


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

> On Tue, Oct 22, 2013 at 04:26:46PM +0200, Rémi Cura wrote:
> > For generality sack,
> >
> > topogeometry output may be better.
> >
> > SET OFtopogeometry GetRelatedLineal( a_source_lineal_topogeom
> TOPOGEOMETRY,
> > a_target_puntal_topogeom_name TEXT (or REGCLASS),
> > a_target_puntal_topogeom_layer_id
> > INT )
>
> I'm not sure you need 2 arguments for the puntal side.
> Are those really "topology_name" and "layer_id" ?
>
> The <table>.<field> identifier, as you reported being the meaning of
> "topogeom_name" in your previous name, is really only the canonical
> deploy table for TopoGeometry objects of a given topology layer,
> so could be derived by "topology_name"/"layer_id".
>
> Additionally, if you only make this work within a single topology
> (very likely) you can derive topology name from the first argument
> (the lineal TopoGeometry) so that you're left with:
>
> SET OF topogeometry GetRelatedLineal(
>            a_source_lineal_topogeom TOPOGEOMETRY,
>            a_target_puntal_topogeom_layer_id INT )
>
> I think it'll need a few more iterations, but it's moving :)
>
> For example, why "related" is assumed to be points ?
> Aren't lineal TopoGeoms also possibly related to areal ?
>
> --strk;
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