[gdal-dev] Ogr2ogr and default value of -gt

[Jukka Rahkonen]

Jukka Rahkonen <jukka.rahkonen <at> mmmtike.fi> writes:

> 
> Hi,
> 
> The default value of -gt parameter of ogr2ogr utility is 200 which is all
> too low for databases. Especially bad it seems to be for SQLite/Spatialite
> and thus also for GeoPackage.
> 
> Are there some drivers which would suffer badly if the default value for -gt
> would be increased to something like 2000 or 4000? It is easy to set the
> value from the command line but most ogr2ogr usage examples we have in the
> documentation are without -gt parameter and I am sure than very many people
> just copy-paste the examples and run ogr2ogr unnecessarily slow.

I took some timings:

ogr2ogr -f GPKG germany.gpkg germany.osm.pbf -gt 20000 -progress 
--config OSM_COMPRESS_NODES YES
Timing: 18 minutes

ogr2ogr -f GPKG germany_2.gpkg germany.osm.pbf -progress 
--config OSM_COMPRESS_NODES YES
Timing: 2 hours and 11 minutes

-Jukka-