Question: How can I import ARC/INFO ASCII grid files into GRASS? Answer: The procedure to follow depends on the GRASS version, you are using. Find details below: Import into GRASS 5.x: Please use the module r.in.arc to import ESRI ARC-GRID format. GRASS 5.0 can distinguished between "zero" and "no data". You can use r.null to change -9999 to "null value". Or you specify this in the header before using r.in.ascii. Markus Neteler Wed Jul 12 2000