[QGIS-Developer] Storing topology information in a vector layer (format)?

Luigi Pirelli luipir at gmail.com
Sat Mar 7 11:08:58 PST 2020

Grass and postgis support topology, you can use qgis a front-end for them.

On Saturday, 7 March 2020, Stefan Keller <sfkeller at gmail.com> wrote:

> Hi,
> This is about processing either an area mesh (tesselation) layer. Area
> meshes are topological structures and issue is that most spatial data
> formats - other than TopoJSON and E00 - are non-topological.
> This in means, that a data reader has to infer the topology from
> geometry (which requires exponential computing time), and even worse,
> that potentially there are topological errors (like gaps,
> overlaps/slivers). The built-in "Topology Checker Plugin" of QGIS [1]
> does the validation preprocessing step.
> Are there any ideas to store topology in a polygon vector layer (e.g.
> as array of features IDs to reference polygon neighbors), so a reader
> (a PyQGIS function/extension) doesn't have to rebuild the topology
> every time?
> :Stefan
> [1] https://docs.qgis.org/3.4/en/docs/user_manual/plugins/core_
> plugins/plugins_topology_checker.html
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Luigi Pirelli

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