ETOPO1 (Earth Topography 1-Minute)

Description

ETOPO1 (Earth Topography 1-minute) is a gridded elevation (land) and bathymetry (sea floor) data set for the entire Earth in a single file. It was compiled using data from many different sources by the National Geophysical Data Center (NGDC) of the National Oceanic and Atmospheric Administration (NOAA). Note that the GLOBE and GTOPO30 data sets also provide global coverage at the higher resolution of 30 arcseconds, but without bathymetry or floating-point values.

Grid Information

Coord. System: Geographic decimal degrees, fixed-angle
Cell Size: 1 arcminute (1/60 of a degree or 60 arcseconds)
Tile Dimensions: 21600 columns and 10800 rows (grid/node-registered version)
21601 columns and 10801 rows (cell/pixel-registered version)
Tile Span: 360 (-180 to 180) degrees x 180 (-90 to 90) degrees, 1 tile
Data Type: 4-byte float
Horizontal Datum: WGS 84
Vertical Datum: sea level
Vertical Units: meters
Nodata Value: Not applicable
Formats: NetCDF, binary (row major, no header, LSB or MSB), ASCII XYZ or GeoTIFF.

Data Source

National Geophysical Data Center (NGDC) of the National Oceanic and Atmospheric Administration (NOAA).

Availability

This data set can be downloaded free of charge from NGDC/NOAA.

Web Sites

ETOPO1 Global Relief: http://www.ngdc.noaa.gov/mgg/global/global.html

ETOPO2 Historic Global Relief: http://www.ngdc.noaa.gov/mgg/global/etopo2.html

ETOPO5 Historic Global Relief: http://www.ngdc.noaa.gov/mgg/global/etopo5.html
(4320 columns and 2160 rows)

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