A UTM projection is not really appropriate for all of North America, which crosses multiple UTM zones. It is only accurate within a single zone. Try a different projection that is appropriate for such large areas (e.g., Lambert Conformal Conic).
Michael On 8/23/07 2:01 AM, "Miriam E. A." <[EMAIL PROTECTED]> wrote: > > Hello everybody, > > I'm triying to reproject a map of north america form llc to utm, but Grass > reports an error about input map is outside output region. > > I choose zone 16N as center of the map, defining a region as the next, in > the UTM Location: > > GRASS 6.3.cvs (UTM):~ > g.proj -p > -PROJ_INFO------------------------------------------------- > name : UTM > datum : nad27 > towgs84 : -22.000,157.000,176.000 > proj : utm > ellps : clark66 > a : 6378206.4000000004 > es : 0.0067686580 > f : 294.9786982000 > zone : 16 > -PROJ_UNITS------------------------------------------------ > unit : meter > units : meters > meters : 1.0 > > g.region n=10000000 s=0 e=10000000 w=0 > > to cover the greatest area possible. > > Does grass support regions crossing various zones UTM? And, UTM considers > north as 0 to avoid negative coords in the north hemisphere, but in GRASS > south must be 0... > > Maybe i'm very wrong. > > Thanks for your attention and for the help (in this and previous emails > and irc). > > Miriam __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
