I've merged two polygon layers from OSM (leisure=parks and natural=wood) into one. When I try to save the merged layer into .gpkg it shows a problem in creating a unique ID for a bunch of values from the layer.
Has anyone come across a similar bug?
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1Three options to solve the problem here: gis.stackexchange.com/a/400741/88814Babel– Babel2025-04-03 15:53:54 +00:00Commented Apr 3 at 15:53
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1 Answer
Use the field calculator to overwrite the existing fid with $id, then save the layer.
Currently some IDs aren't unique, as the error message says, but saving to a geopackage requires them to be unique. Hence you either need to enforce uniqueness, or save to e.g. shapefile.
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3Alternatively in the "Save features as..." , in "Layer options" give a new name for FID field. If that field does not exist, it will be created.user30184– user301842025-04-03 13:39:02 +00:00Commented Apr 3 at 13:39