[postgis-users] A question on ST_RemEdgeModFace usability

[Jose Carlos Martinez Llario]

I think your questions are related with a previous post today about 
synchronizing topogeometries.

In fact, for editing topogeometries without using primitive commands I 
was thinking in:

1.- Delete the topogeometry
2.- Remove the primitives which depend just on the geometry deleted.
3.- With totopogeom insert again the whole geometry

I know this procedure is not optimized at all but maybe this way (with a 
new function which does this work)  one can avoid the complicated task 
about using primitive editing commands and to edit the relation table 
manually.
I have the feeling I not taking into account many things though.

What do you think about this procedure Sandro?


On 12/04/2012 22:43, Andrea Peri wrote:
> Hi, strk,
> thx for explaination.
>
> >> Is this allowed ?
> >
> >I'm redrawing the schema for simplification.
> >
> >You ask:
> >assuming there's a TopoGeometry T1 defined by F1,
> >is the following editing allowed ?
> >
> > +----+----+      +---------+
> > |    |    |      |         |
> > | F1 e F2 |  =>  |    F1   |
> > |    |    |      |         |
> > +----+----+      +---------+
> >
> >No, because doing so would change the shape of T1.
> >
> >--strk;
>
> So, I guess, if I have a topology constraint by a topogeometry layer.
> This is a really big question, because I understand that if I put a 
> topogeometry over a topology I lock (practically) the topology.
> Infact I have quite few choice to editing it if I have put a 
> TopoGeometry on it.
>
> Perhaps
> I could try this option ?
> Always with a TopoGeometry applied over it.
>
> Topogeometry T1 on Face F1.
>
> First change edge from this
> (moving the external edge of F2 and moving also the edge "e")
>
> I guess the ST_ChangeEdge should allow me move the edge "e".
>
>  +----+----+      +---------+-----+
>  |    |    |      |         |     |
>  | F1 e F2 |  =>  |    F1   e  F2 |
>  |    |    |      |         |     |
>  +----+----+      +---------+-----+
>
> and after this remove the external edge of F2
>
>     +---------+
>     |         |
>  => |    F1   e
>     |         |
>     +---------+
>
> Is this allowed ?
>
> Andrea
>
>
> -- 
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
>
>
>
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20120412/02fd2b03/attachment.html>