Jukka,
Automatic FID preservation requires that the source layer reports a
non-empty column name for the FID column, which isn't the case of the
GeoJSON driver. Mostly only SQL-based drivers will report a non-empty
FID column name.
Even
Le 21/06/2021 à 17:04, Rahkonen Jukka (MML) a écrit :
Hi,
Take this GeoJSON
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id":12425552,
"properties":
{
},
"geometry": {
"type": "Point",
"coordinates": [26.30578223, 60.26170791]
}
}]
}
Ogrinfo knows the fid
OGRFeature(one_feature):12425552
Convert into a new GeoPackage and the native fid is lost
ogr2ogr -f gpkg one_feature.gpkg one_feature.json
OGRFeature(one_feature):1
Running the command with “-preserve_fid” keeps the native fid but
according to ogr2ogr documentation
https://gdal.org/programs/ogr2ogr.html
<https://gdal.org/programs/ogr2ogr.html> that should not be needed:
“Use the FID of the source features instead of letting the output
driver automatically assign a new one (for formats that require a
FID). If not in append mode, this behavior is the default if the
output driver has a FID layer creation option, in which case the name
of the source FID column will be used and source feature IDs will be
attempted to be preserved.”
Is the error in the documentation or in the GeoJSON-GeoPackage conversion?
-Jukka Rahkonen-
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