The Southern Alaska CRM was built using GMT 4.3.1 (http://gmt.soest.hawaii.edu/), development version/CVS. GMT 4.3.1 creates grids in netCDF COARDS-compliant format. This is the format of the "gmt4" version in this directory, and is recommended for GMT 4 users. Unfortunately, GDAL (http://www.gdal.org/) does not properly read the netcdf grids created by GMT 4 (grids are inverted south to north). I have thus used GMT 4.3.1 to create the "gdal" version of ETOPO1 in this directory, which is the GMT 3 netCDF legacy format. This version can be properly read by GDAL and is the recommended version for GDAL and GRASS GIS users. Please contact me if you have problems with the Southern Alaska CRM. Elliot.Lim@noaa.gov 24 arc-second Southern Alaska Coastal Relief Model