Directory Identifier: GRAVCD-indiana2
Directory Title: Gravity Data for Indiana
Principal Investigator: Professor William J. Hinze
Contributing Organization: Purdue University
                           Department of Earth & Sciences 
                           Lafayette, IN 47907-0001  

Summary: The gravity data (300 records) were compiled by Purdue 
University. This data base was received in February 1993.  
Principal gravity parameters include Free-air Anomalies and 
Simple Bouguer Anomalies (no terrain correction applied).  The 
observed gravity values are referenced to the International 
Gravity Standardization Net 1971 (IGSN 71).  The gravity anomaly 
computation uses the Geodetic Reference System 1967 (GRS 67) 
theoretical gravity formula. The data appear as 3 transect lines 
-- two parallel lines in a northwest to southeast direction and 
one line in a northeast to southwest direction.