EXTRACT XYZ GRID - TOPOGRAPHY OR GRAVITY

Extract topography or gravity data from global 1-minute grids in ASCII XYZ-format. Latitude range is +/- 80.738. Topography is V9.1(beta) and Gravity is V16.1.

Note that odd values of topography (e.g., -2001m) are constrained by actual soundings while even values (e.g., -2000m) are predicted from gravity. Therefore one can extract the locations of the ship sounding.

EXAMPLE
-10.1
359.5 360
-13
(Any values between -360 and 360 are acceptable)

Enter data window.

Note the program cannot span 0 longitude.
Also, these files can get quite large, so you may have to divide the area up into smaller chunks.

Topography 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.

Gravity Reference: Sandwell, D. T., W. H. F. Smith, Marine gravity anomaly from Geosat and ERS 1 satellite altimetry, Journal of Geophysical Research, v. 102 , No. B5, p. 10039-10054, 1997.