Why is r.slope.aspect giving aspect as degrees from East? Is not the standard degrees from N (terrain azimut)? Agus Dr. Agustin Lobo Instituto de Ciencias de la Tierra (CSIC) Lluis Sole Sabaris s/n 08028 Barcelona SPAIN tel 34 93409 5410 fax 34 93411 0012 alobo at ija.csic.es http://pangea.ija.csic.es/alobo