[postgis-users] Topology editing

[Mats Norén]

On Tue, Jan 8, 2013 at 3:02 PM, Sandro Santilli <strk at keybit.net> wrote:

>
> There's no function to move non-isolated nodes.
> ISO SQL/MM contains no specification about it, and PostGIS
> doesn't provide its own.
>


> What should happen to the node edges ?
> Should only the endpoint move ?
>

The idea is that a user should be able to change the geometry of areas that
should be topologically consistent. My perception was that moving an
endpoint of an edge should be possible as long as the underlying topology
was still valid after a move.
If I have two adjacent faces (picture below)

I should be able to move a single node to get this:



Regards,
Mats

ps.
Apologies for the crappy images but I hope you still get my point.
ds.





> I suggest you use qgis with topological editing
> to move both the node and the edges endpoints
> the way you feel.
> Doing so would give you a feel of what the possible
> outcomes are.
>
> > The usecase is editing topological areas in a web client and have the
> > changes persisted in PostGIS. The user has to be able to move start or
> end
> > nodes in edges in the topology.
>
> What about dropping the old edge and creating a new one ?
>
> --strk;
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