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Vis > data > datasets > ETOPO2 - 2 minute Worldwide Bathymetry/Topography

ETOPO2 - 2 minute Worldwide Bathymetry/Topography

Data taken from National Geophysical Data Center (NGDC) CD-ROM, ETOPO2 Global 2' Elevations, September 2001. A Cylindrical Equidistant projection was used, which spans 360 degrees of of longitude from 180°W eastward to 180°E; latitude coverage is from 90°N to 90°S.

The five major data sources were assembled into the single ETOPO2 2-minute data base without formal edge matching or other methods that alter the data as initially posted. Higher-resolution data take precedence: data derived from GLOBE mask all other data, Smith/Sandwell data come next, followed by IBCAO, with the 5-minute data filling any gaps. Five-minute data from DBDBV and ETOPO5 and 30-second data from GLOBE were regridded to 2 minute spacing by bicubic spline interpolation. IBCAO data were originally gridded in a polar stereographic projection; these data were interpolated along lines of constant latitude at 2 minute steps for every 2 minutes of latitude from 72°N to the pole.

The data are cell-centered, with an array size of 10800 columns x 5401 rows; coverage is from 180°W to 180°E and 90°N to 90°S.

All the files except the JPEGs are located in "/archive/hnv/ETOPO2/" (GFDL only):

ETOPO2.dat Original ASCII version of the dataset in integer meters.

readme.txt Description of the format of the ASCII version.

ETOPO2.nc NetCDF version containing the data as 32-bit floating point values.

ETOPO2_full.png PNG image (10800x5400, 24-bit, ~106MB) of the entire dataset. Viewing the entire image is difficult on a workstation with only 256MB RAM.