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4 votes

How to convert multi-part multipolygon to self-intersecting polygon in PostGIS

PostGIS implements the OGC geometry specification, which prohibits self-intersecting polygons. Some other systems use a different topology, which uses self-touching rings to represent holes that ...
dr_jts's user avatar
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2 votes

How to convert multi-part multipolygon to self-intersecting polygon in PostGIS

As already established, there's no built-in method for what you're trying to achieve. What's available is made with the opposite goal in mind: going from invalid to valid, not the other way around. ...
Zegarek's user avatar
  • 354
1 vote

PostGIS user privileges when working with QGIS projects and layers saved in a PostGIS database

One option is to never use nor save the credentials in QGIS, but instead to use a service file, as described in this post.
JGH's user avatar
  • 41.9k

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