[postgis-users] PostGIS 2.0 - network topology - crosses edges (SQL/MM: Topo-Net: NEDNODE, NEDLINK)

[willi8345 at web.de]

Hi Sandro,
Thank you very much for your quick response - helps me a lot!!
Best wishes, willi


-----Ursprüngliche Nachricht-----
Von: "Sandro Santilli" <strk at keybit.net>
Gesendet: 24.01.2012 09:03:01
An: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
Betreff: Re: [postgis-users] PostGIS 2.0 - network topology - crosses edges (SQL/MM: Topo-Net: NEDNODE, NEDLINK)

>On Tue, Jan 24, 2012 at 08:52:54AM +0100, willi8345 at web.de wrote:
>> Hi,
>>
>> I'm trying to build a linear application (topology network) with PostGIS
>> 2.0.0SVN.
>>
>> My real world situation has crosses edges with no nodes (water lines or
>> hiqh voltage power lines in different heights or levels, where both edges
>> have nothing to do with each other).
>>
>> Topo-Geo assumes full planar topology and gives me an error on this
>> crossing edges.
>> (SQL/MM Spatial exception - egometry crosses an edge)
>>
>> The only possiblity I see at the moment to build it up in different
>> topology schemas, which would be ok for example between water lines and
>> low voltage cables, but not between high voltage power lines themselves.
>>
>> Is it possible with PostGIS 2.0 (at the moment) to build up this situation
>> within on topology schema?
>>
>> If yes - how?
>> If no - will it come up in future versions?
>
>Not possible with Topo-Geo. As you point out SQL/MM Topo-Geo assumes planar
>topology. But SQL/MM Network-Topology will let you model your network.
>
>Network-topology is not available in 2.0, but could surely come up in
>future versions if anyone will be investing time / money on it.
>
>--strk;
>
> () Free GIS & Flash consultant/developer
> /\ http://strk.keybit.net/services.html
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