[Incubator] Resolve overlap and gap in Simple feature by using Postgis Topology

[Lars Aksel Opsahl]

Hi


One off the difference between using Postgis Topology and tools like triangulatio, makevalid is that you get persistent db structure where you check for how lines are used like checking  like testing left_face = right_face.


The input may be valid but we still like remove tiny gaps and overlaps across multiple big layers.  We also get back the ref to original attributes in a view poiting to the input tables .


In Postgis Topology we also have methods like https://postgis.net/docs/ValidateTopology.html to check more in details on the result.


Thanks.


Lars



________________________________
From: Incubator <incubator-bounces at lists.osgeo.org> on behalf of Brian M Hamlin <maplabs at light42.com>
Sent: Wednesday, July 5, 2023 7:27 AM
To: incubator at lists.osgeo.org <incubator at lists.osgeo.org>
Subject: Re: [Incubator] Resolve overlap and gap in Simple feature by using Postgis Topology

Hi -
 > > you are proposing two things that are not related in any way?

  methods for gap / overlap fixing with triangulation are well studied

  e.g.

  A triangulation-based approach to automatically repair GIS polygons.
Hugo Ledoux, Ken Arroyo Ohori and Martijn Meijers. Computers &
Geosciences 66, May 2014, pp. 121–131. ISSN: 0098-3004.
doi: 10.1016/j.cageo.2014.01.009

Related source code is available at
https://github.com/tudelft3d/prepair


 hth   --Brian M Hamlin    /  MAPLABS  /  OSGeoLive PSC



________________________________
From: Incubator <incubator-bounces at lists.osgeo.org> on behalf of Brian M Hamlin <maplabs at light42.com>
Sent: Wednesday, July 5, 2023 7:27 AM
To: incubator at lists.osgeo.org <incubator at lists.osgeo.org>
Subject: Re: [Incubator] Resolve overlap and gap in Simple feature by using Postgis Topology

Hi -
 > > you are proposing two things that are not related in any way?

  methods for gap / overlap fixing with triangulation are well studied

  e.g.

  A triangulation-based approach to automatically repair GIS polygons.
Hugo Ledoux, Ken Arroyo Ohori and Martijn Meijers. Computers &
Geosciences 66, May 2014, pp. 121–131. ISSN: 0098-3004.
doi: 10.1016/j.cageo.2014.01.009

Related source code is available at
https://github.com/tudelft3d/prepair


 hth   --Brian M Hamlin    /  MAPLABS  /  OSGeoLive PSC


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