hmmm really strange... did you verify the topology of the world map? v.build map=$map
ciao Il giorno gio, 01/11/2007 alle 16.11 +0100, Martin Bley ha scritto: > Hi, > > I still get stucked on an issue using v.overlay. I imported > a shapefile > with the world continents (the one from ESRI). Projection > is Lat-Long. > Then I draw a line using v.in.ascii representing a latitude > e.g. > > VERTI > L 2 1 > -180 -80 > 180 -80 > 1 1 > > Now I use the following command to merge the intersection > between the > latitude (80 South) and the areas in the world continents > vector. > > v.overlay ainput=$vector atype=line alayer=1 binput=World > btype=area \ > blayer=1 output=$out operator=and > > Works pretty well so far, until I reach latitude South 75+. > Intersections doesn't > match continents anymore (please see attached PNG file). > > I would appreciate any hint. > > Regards, > Martin > > _______________________________________________ > grassuser mailing list > [email protected] > http://grass.itc.it/mailman/listinfo/grassuser -- Ti prego di cercare di non inviarmi files .doc, .xls, .ppt, .dwg. Preferisco formati liberi. Please try to avoid to send me .doc, .xls, .ppt, .dwg files. I prefer free formats. http://it.wikipedia.org/wiki/Formato_aperto http://en.wikipedia.org/wiki/Open_format Ivan Marchesini Department of Civil and Environmental Engineering University of Perugia Via G. Duranti 93/a 06125 Perugia (Italy) Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it e-mail: [EMAIL PROTECTED] [EMAIL PROTECTED] tel: +39(0)755853760 fax (university): +39(0)755853756 fax (home): +39(0)5782830887 jabber: [EMAIL PROTECTED] _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
