Hi! I am considering the possibility of importing x,y,z data from a "tin" an ASCII format. In a format that Arcinfo's TIN can read) However I don't know if grass can deal with x,y coordinates that are not equidistant. Is there a way to do this in grass or should I order the DXF format? (its more expensive) Keith M. Mitchell Agronomy keith at piked2.agn.uiuc.edu