Hi Evan, thank you for the explanation. That makes sense. However, in my opinion ogr2ogr behavior is not really consistent in this case: The column ogc_fid , which is in fact the track id, is incremented on each gpx file import ( regardless if you use -update -append or not ).
Michael Am 02.01.2021 um 14:03 schrieb Even Rouault: > Michael, > > You have a single track in each file, so it is expected that track_fid > doesn't > change and is set at 0 (as there's no attribute to uniquely identify a track) > For what you want to do (that is have distinct track_fid for each file), > you'll likely have to use an intermediate postgresql schema, where you would > correct the value of track_fid, before merging them together > > Even > >> clarification: second table of my points is 'track_points'. >> >> Also adding my 2 gpx files for reference: >> >> *file1.gpx:* >> >> <?xml version="1.0" encoding="UTF-8"?> >> <gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1";> >> <metadata> >> </metadata> >> <trk> >> <trkseg> >> <trkpt lat="49.250324000" lon="8.687196000"> >> <ele>1</ele> >> </trkpt> >> <trkpt lat="49.250019001" lon="8.687469003"> >> <ele>1</ele> >> </trkpt> >> <trkpt lat="49.249714001" lon="8.687742003"> >> <ele>1</ele> >> </trkpt> >> </trkseg> >> <trkseg> >> <trkpt lat="49.125652000" lon="8.714194000"> >> <ele>2</ele> >> </trkpt> >> <trkpt lat="49.125519000" lon="8.714731000"> >> <ele>2</ele> >> </trkpt> >> <trkpt lat="49.125414000" lon="8.715057001"> >> <ele>2</ele> >> </trkpt> >> </trkseg> >> </trk> >> </gpx> >> >> *file2.gpx:* >> >> <?xml version="1.0" encoding="UTF-8"?> >> <gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1";> >> <metadata> >> </metadata> >> <trk> >> <trkseg> >> <trkpt lat="49.11" lon="8.7"> >> <ele>3</ele> >> </trkpt> >> <trkpt lat="49.12" lon="8.7"> >> <ele>3</ele> >> </trkpt> >> <trkpt lat="49.13" lon="8.7"> >> <ele>3</ele> >> </trkpt> >> </trkseg> >> </trk> >> </gpx >> >> Am 01.01.2021 um 18:04 schrieb Michael Saupe: >>> Hello folks, >>> >>> I am importing multiple gpx files into a postgis database. The tables >>> 'tracks' and 'track_points' are created / updated. >>> >>> The column track_fid in in the track_points table should be a reference to >>> the track feature id as documented in >>> https://gdal.org/drivers/vector/gpx.html, however it is always zero. >>> >>> Is this a bug or am I missing something? >>> >>> Details >>> >>> I am creating an empty database, then create postgis extension with >>> 'CREATE EXTENSION POSTGIS' >>> >>> I have two simple gpx files ( see attachments ) >>> >>> * file1.gpx - containing 2 track segments - each with 3 track points >>> * file2.gpx - containing 1 track segment with 3 track points >>> >>> I am using commands >>> >>> ogr2ogr -f PostgreSQL -update -append "PG:dbname=testdb host=localhost >>> user=postgres password=xx port=5432" file1.gpx >>> >>> ogr2ogr -f PostgreSQL -update -append "PG:dbname=testdb host=localhost >>> user=postgres password=xx port=5432" file2.gpx >>> >>> Resulting data in 'tracks' >>> >>> ogc_fid name cmt desc src link1_href link1_text >>> link1_type >>> link2_href link2_text link2_type number type >>> wkb_geometry 1 > NULL >>> NULL NULL NULL NULL NULL NULL NULL NULL NULL >>> NULL > NULL ... 2 >>> NULL NULL NULL NULL NULL NULL NULL NULL NULL >>> NULL > NULL NULL >>> ... >> Resulting data in 'track_points' >> >> ogc_fid track_fid track_seg_id track_seg_point_id ele >> time .... > other >> columns omitted ... 1 0 0 0 1 NULL >> 2 0 0 1 1 NULL >> 3 0 0 2 1 NULL >> 4 0 1 0 2 NULL >> 5 0 1 1 2 NULL >> 6 0 1 2 2 NULL >> 7 0 0 0 3 NULL >> 8 0 0 1 3 NULL >> 9 0 0 2 3 NULL >> >>> Expected: >>> >>> ogc_fid track_fid track_seg_id track_seg_point_id ele >>> time .... >>> other columns omitted ... 1 1 >>> >>> 0 0 1 NULL >>> >>> 2 1 >>> >>> 0 1 1 NULL >>> >>> 3 1 >>> >>> 0 2 1 NULL >>> >>> 4 1 >>> >>> 1 0 2 NULL >>> >>> 5 1 >>> >>> 1 1 2 NULL >>> >>> 6 1 >>> >>> 1 2 2 NULL >>> >>> 7 2 >>> >>> 0 0 3 NULL >>> >>> 8 2 >>> >>> 0 1 3 NULL >>> >>> 9 2 >>> >>> 0 2 3 NULL >>> >>> I also tried to omit -update -append, but same result. >>> >>> Versions: >>> * Postgres: "PostgreSQL 12.5 on x86_64-pc-linux-musl, compiled by gcc >>> (Alpine 9.3.0) 9.3.0, 64-bit" * Postgis: "POSTGIS="3.0.3 0" [EXTENSION] >>> PGSQL="120" GEOS="3.8.1-CAPI-1.13.3" PROJ="7.0.1" LIBXML="2.9.10" >>> LIBJSON="0.14" LIBPROTOBUF="1.3.3" WAGYU="0.4.3 (Internal)"" * Gdal: >>> 3.2.0 > _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
