On Thu, Oct 31, 2013 at 8:28 AM, Martin Dobias <[email protected]> wrote: > Hi Denis & Pierre > > On Thu, Oct 31, 2013 at 1:45 PM, Denis Rouzaud <[email protected]> > wrote: >> >> I put the dev list in copy, since there should be someone arond who's more >> aware on the topic. >> I saw that Martin Dobias was the committer for the topology editing [0]. >> Martin, do you have any suggstion on this? > > Let me give some historical context first because I am afraid we are > mixing two different things :-) > > For a long time QGIS has some support for "topology editing". But > that's not a proper topology editing as one may think - from > documentation: > "The option Enable topological editing is for editing and maintaining > common boundaries in polygon mosaics. QGIS ‘detects’ a shared boundary > in a polygon mosaic and you only have to move the vertex once and QGIS > will take care about updating the other boundary." > > Originally there were separate map tools for addition, removal and > moving of points which were also doing updates to the shared > boundaries of polygons if the "topological editing" was enabled. The > old commit Denis is referring to was basically meant to add the same > functionality also to the newly created node tool that was meant to > replace the three separate tools. > > Now about "real" topology editing of data consisting of nodes and > edges - as discussed already in issue #3483, there are various > topology models (PostGIS topo, GRASS, OpenStreetMap, ...?) that would > need slightly different set of tools and validation methods. I have > not really investigated if it is possible to have a support to cover > all of those models - or even it is worth it. Maybe for a start it > would be enough to pick one and focus just on that (PostGIS topo being > my personal favorite).
I would prefer something generic from the beginning. We started to talk about such common editing interface (PostGIS / GRASS) with strk in Zurich. IIRC we were able to find common editing methods. There should be some photos of our hand drawn schemas around and strk should have a paper with the list of methods. Strk, could you publish a scan of it somewhere on Web? Radim > In general I would love to see a new "topology" layer type in QGIS > (next to vector and raster) that would bring native topology viewing > and editing capabilities to QGIS. I am not aware of anyone working on > that - if you can spend some time on that matter, I am sure you will > make many people happy :-) > > Regards > Martin > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
