#1798: all relevant vector modules should have cats and where parameters ----------------------------------+----------------------------------------- Reporter: mlennert | Owner: grass-dev@… Type: enhancement | Status: new Priority: normal | Milestone: 7.0.0 Component: Vector | Version: svn-trunk Keywords: where cats parameter | Platform: Unspecified Cpu: Unspecified | ----------------------------------+-----------------------------------------
Comment(by glynn): Replying to [comment:6 mmetz]: > The advantage of a virtual map over using v.extract to get a "permanent" selection by cats/where is not clear to me Disk usage. A virtual map wouldn't require an extra copy of the coordinates and topology. > because the result of v.extract can be processed faster than a virtual map. In the simplest case, a virtual map shouldn't be any slower than providing cats=/where= on the command line; they both do the same thing. There may be a difference in the case where you use where= when creating the virtual map and again when processing it (i.e. you'd have to "compose" the where= queries). -- Ticket URL: <http://trac.osgeo.org/grass/ticket/1798#comment:8> GRASS GIS <http://grass.osgeo.org> _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev