Free air gravity anomaly map derived from Geosat and ERS-1 satellite altimetry

Reference:

Sandwell, D.T. and Smith, W.H.F., 1997, Marine gravity anomaly from Geosat and ERS-1 satellite altimetry: Journal of Geophysical Research - Solid Earth, v. 102 (B5) 10039-10054

(Thanks also to Lisa Gahagan UTIG, Austin, TX)