[postgis-users] questions/issues when creating a topology

[Sandro Santilli]

On Mon, Jan 25, 2016 at 01:26:35PM -0200, Lucas Ferreira Mation wrote:

> > https://plugins.qgis.org/plugins/pgtopoeditor/
> 
> I see cool options to remove find dangling edges, remove edges and points
> and find Orpaned topogeoms. But supose I wanto to change the shape of an
> edge, by mooving a few vertices among it's path in QGIS, while preserving
> the nodes where it intersects with other edges. Is it possible to do that
> (and preserve the topological properties)?

There's currently no GUI for calling ST_ChangeEdgeGeom, but if you are
_careful_ you can still move internal vertices by editing the edge
layer as a normal edit.

> What about moving nodes? Can pgtopoeditor manage that?

Nope, no support for that either.
What you can do is edit a TopoGeometry (supported by QGIS core) and
then remove the primitive components that you don't need anymore.

> > Or you could build a cache of bounding boxes, automatically updating
> > it whenever the primitives in the topology are updated, and use that
> > column as a filter.
> 
> this is interesting idea. Any example on this?

Nope, sorry, you'll have to build this up yourself.
Consider writing your notes to the postgis wiki, for others to use
as example  :)

--strk;