ETOPO1: 1 Arc-Minute Global Relief Model

The National Geophysical Data Center (NGDC), an office of the National Oceanic and Atmospheric Administration (NOAA) developed the ETOPO1 1 Arc-Minute Global Relief Model of Earth's surface. It provides complete global topographic and bathymetric coverage between -90° to +90° in latitude and -180° to +180° in longitude. It was generated from diverse global and regional digital data sets, which were shifted to common horizontal and vertical datums: World Geodetic System 1984 (WGS 84) and sea level; and then evaluated and edited as needed. It was designed to support tsunami forecasting, modeling and warning, as well as ocean circulation modeling and Earth visualization. It has replaced the historic ETOPO2v2 and ETOPO5 global relief grids. It is available in two grid versions.

• ETOPO1 Ice Surface: Grid of Earth's surface depicting the top of the Antarctic and Greenland ice sheets.
• ETOPO1 Bedrock: Grid of Earth's surface depicting the bedrock underneath the ice sheets.
Relief for the rest of the world is the same in both versions.

Reference:
Amante, C. and B. W. Eakins, ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis. NOAA Technical Memorandum NESDIS NGDC-24, 19 pp, March 2009.

Variables
ETOPO1 Bedrock: Bathymetry (m)
ETOPO1 Ice Surface: Bathymetry (m)
Zonal Global by 1 Arc-Minute or 1/60 deg
Meridional Global by 1 Arc-Minute or 1/60 deg
VerticalSea Level  
Temporal N/A
Static?yes
Volume446MB per variable
Serverpublic:
Sourcehttp://www.ngdc.noaa.gov/mgg/global/global.html 
Acquired Apr 15, 2011 (Updated Apr 2014)
APDRC contact
Supplements ETOPO1.pdf