[postgis-users] topology : statue of topogeom composition?

[Rémi Cura]

Thanks!
Cheers,
Rémi-C

2015-11-16 8:49 GMT+01:00 Sandro Santilli <strk at keybit.net>:

> On Thu, Nov 12, 2015 at 06:43:03PM +0100, Rémi Cura wrote:
>
> > First of all is it possible to have topogeometry composed of other
> > topogeometry, themselves composed of other geometry, and so one?
>
> Yes, when the TopoGeometry layer is a "hierarchical layer"
> (has a not null "child_layer" value in topology.layer) then
> the "type" field of its TopoElements references its child layer
> id and the "id" field references the identifier of a coposing
> TopoGeometry object.
>
> > Second,
> > if this is possible, are this kind of topogeometry properly maintained
> when
> > there is a change in the low level topology (splitting an edge for
> > instance).
>
> The upper levels are composed by the lower levels.
> The lowest levels (primitive layers) are properly maintained
> and thus the higher one are too.
>
> --strk;
>
>   ()   Free GIS & Flash consultant/developer
>   /\   http://strk.keybit.net/services.html
>
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