[QGIS-Developer] Library behind native plugin 'Check Geometries'

[Jakob]

What is the rutine or library behind - that the QGIS native plugin Check
Geometries uses. This plugin finds at lot more topological errors and other
data inconsistencies than PostGIS st_isvalid() by GEOS and the QGIS menu
Vector > Geometry Tools > Check Validity (Method QGIS or GEOS). 

Jakob



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