The gravity station data total 3064 records. This data base was received in April
1997. Principal gravity parameters include Freeair Anomalies which have been adjusted
to the International Gravity Standardization Net 1971 (IGSN 71), and the gravity anomaly
computation uses the Geodetic Reference System 1980 (GRS80) theoretical gravity formula.
The data are randomly distributed within the boundaries of Portugal.
