Directory Identifier: GRAVCD-90ngsnet
Directory Title: NGS Gravity Network Data for the U.S.
Principal Investigator: Numerous

Contributing Organization: National Geodetic Survey
11400 Rockville Pike 
Room 107
Rockville, MD 20852

Summary: The gravity network data (7,298 records) were gathered by various governmental organizations (and academia) using a variety of methods. This file was created by NGDC, by extracting monument records from the 1990 NGS Station Data Base. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (with terrain correction applied only in areas where substantial variations in local topography exist). The gravity station data has been adjusted to the International Gravity Standardization Net 1971 (IGSN 71) and the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the boundaries of the U.S. and Alaska.

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