[gdal-dev] Meaning of First pass in reading GeoJSON

[Rahkonen Jukka (MML)]

Rahkonen Jukka (MML) wrote:

> That certain dataset contains just geometries but no attributes. I do not know if geometries are all 
> polygons of if multipolygons can also appear. However, I hoped that by setting the environment
> variable ATTRIBUTES_SKIP=YES and defining -nlt PROMOTE_TO_MULTI I could make GDAL to skip the
> first pass. I think that in this special case there is already a way to provide both the the schema and
> geometry type. I can also see that GDAL did read the ATTRIBUTES_SKIP setting correctly.

> GeoJSON: Skip all attributes.
> GeoJSON: First pass: 4136960 bytes read

I forgot to mention that another existing option that user has for defining the schema and geometrytype is to write data into existing target by using ogrinfo with -append but without -addfields.

-Jukka-