Hi Markus, Thank you for your reply. This is the original vector:
v.db.connect -p cont Vector map <c...@permanent> is connected by: layer <1> table <cont> in database </home/stuart/grassdata/aawt_mga55/PERMANENT/dbf/> through driver <dbf> with key <cat> The v.split command and output: v.split input=cont output=contSplit length=10000 100% Building topology for vector map <contSplit>... Registering primitives... 37377 primitives registered 2176557 vertices registered Building areas... 100% 0 areas built 0 isles built Attaching islands... Attaching centroids... 100% Number of nodes: 38377 Number of primitives: 37377 Number of points: 0 Number of lines: 37377 Number of boundaries: 0 Number of centroids: 0 Number of areas: 0 Number of isles: 0 Proof that there is no attribute table: v.db.connect -g contSplit ERROR: Database connection for map <contsp...@permanent> is not defined in DB file I hope that this is this what you were after. Thanks, Stuart On Tue, Aug 24, 2010 at 5:22 PM, Markus Metz < [email protected]> wrote: > Stuart Gralton wrote: > > Hello Everyone, > > > > I am trying to use v.overlay to clip contour lines for a specific area. > The > > contour lines were imported into GRASS from a shapefile which is about > 33Mb. > > The query was as follows: > > > > v.overlay ainput=contour atype=line binput=boundingbox > output=contour_clip > > operator=and > > > > The operation took 16 hours to complete, which seems excessive. Is there > > anything that I can do to speed things up? > > > > I am aware of v.split, v.select, v.clean as suggestions from other posts > as > > ways of increasing performance. Unfortunately none of these helped me > very > > much: > > > > v.split seems to drop the attribute table (but it has amazing effects > on > > performance). > > v.spllt does copy all attribute tables. Can you post the output of > v.db.connect -p or v.db.connect -g for the original vector and the > output of v.split? > > Markus M > > > v.select helps a little, but due to the nature of the data, not many > > features are removed. > > v.clean did not have any effect. The data is from the government, and > is > > already of high quality. > > > > > > Is there anything that I am missing? Or is there any way to preserve the > > attribute table when using v.split? > > > > Thanks in advance, > > Stuart > > > > > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > > > > >
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