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

[Rémi Cura]

Thanks!
Cheers,
Rémi-C

2015-11-16 8:49 GMT+01:00 Sandro Santilli :

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

[Sandro Santilli]

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

[Rémi Cura]

Hello everybody.
a question mostly for Sandro I'm afraid.

What is the current status of postgis topology regarding composition
between topogeometry?

First of all is it possible to have topogeometry composed of other
topogeometry, themselves composed of other geometry, and so one?

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).

I think I know the answers,
but I really would like to be sure.

Thanks =)

Cheers,
Rémi
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