Il 16/02/2022 12:24, Even Rouault ha scritto:
your [2] link contains the shapefile, not the GeoPackage file.
Hi Even,
yes, you are right. The correct URL for the GeoPackage layer is
https://drive.google.com/file/d/1DMMbFQ922d_ccS00JIt0KaojGk6jMorb
Or you can use the SHAPE_REWIND_ON_WRITE configuration option
mentioned at
https://gdal.org/drivers/vector/shapefile.html#advanced-topics :
ogr2ogr out3.shp Issue47288_Polygons.gpkg --config
SHAPE_REWIND_ON_WRITE OFF
This will keep the original geometry mostly untouched, possibly
creating a non-conformant shapefile. And on the reading side, the OGR
shapefile reader might also have issues reconstructing a
single-feature geometry. On that particular case, it seems to produce
the "expected" result
Yes, exporting to Shapefile with this option, the visualization issue in
QGIS doesn't occur in this case and the parts maintain their
winding/orientation.
Thanks for the insight about the issue and on how the driver works under
the hood and deal with the (not always clear) specification.
My inclination would be to consider that in the case where we have a
multipolygon with non -coplanar parts we should probably be avoiding
considering the ones that are non-coplanar are inner/outer rings of
others.
I've ticketed that in https://github.com/OSGeo/gdal/issues/5315
Thank you again.
Best regards.
Andrea
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