Giovanni Manghi wrote: > > > 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. Markus Metz wrote: > > 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. Nikos Alexandris wrote: in grass64 (without snapping): > time v.in.ogr dsn=TM_WORLD_BORDERS-0.3.shp out=tm_world_borders_03 > --%<--- > 3775 input polygons > Total area: 1.473113e+14 (8484 areas) > Overlapping area: 3.402229e+09 (2294 areas) > Area without category: 3.994093e+11 (2292 areas) > real 55m10.964s > user 54m50.060s > sys 0m8.040s > -->%--- > > :-O in grass64 with snapping=0.1: time v.in.ogr dsn=TM_WORLD_BORDERS-0.3.shp out=tm_world_borders_03_snapped_01 snap=0.1 --%<--- 3775 input polygons Total area: 1.480245e+14 (4647 areas) Overlapping area: 0.000000e+00 (0 areas) Area without category: 1.139301e+12 (1628 areas) real 0m52.400s user 0m49.730s sys 0m1.250s -->%--- in grass70 with snapping=0.1: time v.in.ogr dsn=TM_WORLD_BORDERS-0.3.shp out=tm_world_borders_03_grass70_snapped_01 snap=0.1 --%<--- 3775 input polygons Total area: 1.37653E+14 (4375 areas) Overlapping area: 0 (0 areas) Area without category: 1.11988E+12 (1475 areas) real 0m53.130s user 0m51.160s sys 0m1.240s -->%--- Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
