> Mark wrote: > > Is the best way to clip data to use the v.overlay command with the > > "and" operator? > > > > it works great, but seems quite slow on larger datasets. > > Additionally as an example, if i have topographic contour lines, and > > i want to clip them to a polygon, and only want the topo line > > attributes (elevation) outputted, is there a way to do this? Is > > there another way to clip line data to within a polygon that might > > be a bit faster? > Hamish: > run v.select, then v.overlay. That way the intensive v.overlay > operation only happens for relevant vector features. Then it will > speed up hugely. > > I wonder if v.select functionality could be built into v.overlay as a > preprocessing step?
(see Radim's doc/vector/TODO in the source code; maybe splitting long boundaries helps too?) Hamish _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
