Surface topography of the earth based on satellite and in situ measurements.
Satellite and in situ measurements are combined to form a data set of the earth's surface relief. Note that ocean values are negative and orography over land is positive.
Reference: Smith, W. H. F., and D. T. Sandwell, Global seafloor topography from satellite altimetry and ship depth soundings, Science, v. 277, p. 1957-1962, 26 Sept., 1997
surface relief (m)
|Zonal||Global by 1/60 (topo1), 1/30 (topo2) deg|
|Meridional||Global by 1/60 (topo1), 1/30 (topo2) deg|
|Acquired||Jan 1, 2005 (Updated Apr 2014)|