On Friday 15 of March 2013 17:02:01 Nikos Alexandris wrote: > On Friday 15 of March 2013 09:31:06 Stephen Sefick wrote: > > All, > > I am thinking of moving to grass7. I know that the vector back end has > > changed and there is a requirement to rebuild vector topology. > > Better & Faster (thanks to all and especially to Markus Metz) :-)
On the matter, I just imported the following data set:
402K BurntAreas_2000_2012.dbf
367 BurntAreas_2000_2012.prj
7.9M BurntAreas_2000_2012.shp
115K BurntAreas_2000_2012.shx
# both cases, identical report on overlapping areas:
--%<---
WARNING: 11018 areas represent more (overlapping) features, because
polygons overlap in input layer(s). Such areas are linked to more
than 1 row in attribute table. The number of features for those
areas is stored as category in layer 2
-----------------------------------------------------
14685 input polygons
Total area: 4.78085E+10 (34287 areas)
Overlapping area: 4.05856E+09 (11018 areas)
Area without category: 9.32859E+08 (3744 areas)
--->%--
in G6, revision=55280M
real 2m4.002s
user 1m19.377s
sys 0m9.093s
# v.info -t returns
nodes=63241
points=0
lines=0
boundaries=57140
centroids=30543
areas=34287
islands=9845
faces=0
kernels=0
primitives=87683
map3d=0
in G7, revision=55284M
real 0m33.384s
user 0m29.194s
sys 0m4.092s
# v.info -t returns
nodes=32698
points=0
lines=0
boundaries=57140
centroids=30543
areas=34287
islands=9845
primitives=87683
map3d=0
Much faster!!
Thanks, Nikos
--
ps- Curious: why is the reported number of "nodes" different?
signature.asc
Description: This is a digitally signed message part.
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
