Antonio Valanzano anvalanz at gmail.com
Wed Jan 8 10:29:59 PST 2025
Does someone know if this algorithm is based on GEOS?
Hi Antonio,
the geometric operations executed by the "Union" processing algorithm in
QGIS are actually performed mostly by the GEOS library.
You can see the algorithm so
Hi, Antonio.
Despite their names, the QGIS "Union" geoprocessing tool has a
completely different behavior than the PostGIS "ST_Union" function.
There is another QGIS tool called "Dissolve" which, when run without
selecting an optional dissolve field, should have similar output to
the ST_Union fun
Does someone know if this algorithm is based on GEOS?
I am asking this because its *behaviour is* different from that of ST_Union
in PostGIS or Spatialite (both based I assume on the GEOS library).
>From QGIS help
"This algorithm checks overlaps between features within the Input layer and
create
