[GRASS-user] v.in.ogr suddenly slow?

[Markus Metz]

Giovanni Manghi wrote:
> Hi all,
>
> I just made a fresh install on my pc, Ubuntu 10.04 and GRASS 6.4 rc6
> from the Ubuntugis repository.
>
> It seems to me that v.in.ogr is quite slower if compared with my old
> installation (6.4 rc5 on Ubuntu 9.04)
>
> for example this
>
> http://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
>
> takes nearly 5 minutes and before it took much less.

Here it takes nearly 30 minutes with grass64, all versions, RC5 is not
faster than RC6 or current svn. This vector is extremely dirty,
boundaries of adjacent polygons don't match, resulting in about 2300
overlapping areas and about 2400 spurious areas (gaps between adjacent
polygons) equaling about 4700 erroneous areas for only 3775 input
polygons. Import time was reduced to 4 minutes when snapping
boundaries during import. With snapping during import and grass7, it's
down to 1 min 46 sec and the result is topologically clean.

I would rather use another world boundary layer, e.g. UN FGGD from FAO
geonetwork.

Markus M