Gravity Anomaly Data
====================
(NOTE: For complete information visit the following URL:

 http://cddisa.gsfc.nasa.gov/926/egm96/egm96.html)

Also see egm96.txt.

Four files containing the gravity anomaly data which were used in 
the development of EGM96 are provided.

EGM96 is a geopotential model of the Earth consisting of spherical 
harmonic coefficients complete to degree and order 360. It is a 
composite solution, consisting of: (1) a combination solution to 
degree and order 70; (2) a block diagonal solution from degree 71 
to 359; and (3) the quadrature solution at degree 360.  This model, 
just completed, is the result of a collaboration between the 
National Imagery and Mapping Agency, the NASA Goddard Space Flight 
Center, and the Ohio State University.


(A) nima.v060796.alt.min30.dt2   Altimetry 30' values from NIMA
(A) renamed to: na30min.dat

(B) nima.v091296.terr.min30      Terrestrial 30' values from NIMA
(B) renamed to: nt30min.dat

(C) osu.v072189.terr.min30_mod   Terrestrial 30' values from OSU
(C) renamed to: ot30min.dat

(D) nima.v091296.terr.deg01      Terrestrial 1 deg. values from NIMA
(D) renamed to: nt01deg.dat

In addition, a file containing harmonic coefficients of the 
potential is provided. These coefficients may be used to derive 
"fill-in" values for areas void of any other type of gravity 
anomaly information. This file is called:

                egm96s.to040.rti.f041t360.jgp95e
                renamed to: egm96s.dat

The documentation describing these files is provided in two forms:

(1) DOCUM.gravity_data.mac.word5.1   Macintosh WORD 5.1 format
(1) renamed to: documnt.mac

(2) DOCUM.gravity_data.ps            PostScript format
(2) renamed to: documnt.ps

Please read the documentation files first. The data files are ASCII 
and instructions on how to read and interpret the information is 
given in the documentation files.

If you are unable to 'translate' either format of the documentation
files please send e-mail to:

    npavlis@geodesy2.gsfc.nasa.gov       or

    flemoine@olympus.gsfc.nasa.gov

Include your complete address in your message. A hard copy of the
documentation will be faxed or mailed to you.