http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2g/ETOPO2v2g_ReadMe.txt nETOPO2v2 2006 (version: ETOPO2v2g - Grid-centered registration) Data set credit: U.S. Department of Commerce National Oceanic and Atmospheric Administration National Environmental Satel ...