| The gravity station data (9,050 records), were observed and processed by the Instituto
Geografico Agustin Codazzi(IGAC), in Colombia from 1958 to 1996. This data base was
received in April, 1997. Principal gravity parameters include Free-air anomalies and
both Simple and Complete Bouguer anomalies. The gravity anomaly values were computed
using the GRS80 ellipsoid. |