ETOPO2v2 2006: Data set credit: U.S. Department of Commerce National Oceanic and Atmospheric Administration National Environmental Satellite, Data, and Information Service National Geophysical Data Center http://www.ngdc.noaa.gov/mgg/fliers/06mgg01.html Summary: ETOPO2 grids are in meters. First and foremost, ETOPO2v2 eliminates a 1-cell westward bias that was present in the previous version. Forms: 1)ETOPO2v2c is in a cell-centered registration (pixel registered); the cell boundaries are lines of even minutes of latitude and longitude, and they are centered on intersections of lines of odd minutes of latitude and longitude. 2)ETOPO2v2g is in a grid-centered registration (pixel registered); the cell boundaries are lines of odd minutes of latitude and longitude, and they are centered on intersections of lines of even minutes of latitude and longitude. This is the same as the original ETOPO2, which was grid-registered, meaning that cells were centered on the integer multiples of 2 minutes (even minutes) of latitude and longitude and the cell boundaries were consequently defined by lines of odd minutes of latitude and longitude. The first row of 10,801 (360 x 30) cells in ETOPO2 redundantly repeated the same data value, centered on the north pole. A data row, centered on the South Pole, was not included in the original ETOPO2, but exists in ETOPO2v2g. Availability: ETOPO2v2 is available in its entirety on DVD or for free download via the Web: http://www.ngdc.noaa.gov/mgg/fliers/06mgg01.html For More Information: For more information, and complete documentation, see the readme files in either the ETOPO2v2c or ETOPO2v2g subdirectories. For complete DVD (and online subdirectory) contents, please see the file ETOPO2v2_DVD_Contents.txt in this subdirectory.