ETOPO1 (1 Arc-Minute) Global Relief Model

In August 2008, the National Geophysical Data Center (NGDC), an office of the National Oceanic andAtmospheric Administration (NOAA) developed the ETOPO1 1 Arc-Minute Global Relief Model as an improvementto the ETOPO2v2 Global Relief Model.

ETOPO1 is available in “Ice Surface” (top of Antarctic and Greenland icesheets and “Bedrock” (base of the ice sheets) versions. Both versions of ETOPO1 were generatedfrom diverse global and regional digital data sets , which were shifted to common horizontal and vertical datums, and then evaluated and edited as needed.

This report provides a summary of the datasources and methodology used in developing ETOPO1:

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