Using the v.select module first to limit the number of features clipped often helps speed up the intersection process.
Mark On Mon, Aug 23, 2010 at 8:45 AM, Stuart Gralton <[email protected]> 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.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 > > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
