DEFAULT GRAVITY FIELD FILE (UNIT 12)

UNIT 12 in GEODYN IIS is used as input unit for gravity field setup. Gravity information on UNIT 12 will be used unless other information is input on UNIT 05. Cards which can be input on UNIT 12 are the following:

• TITLE which contains descriptive information.
• EARTH which introduces earth constants.
• GCOEF which C and S defines coefficients in the geopotential model.
• GCOEFC which defines C coefficients in the geopotential model.
• GCOEFS which defines S coefficients in the geopotential model.

The structure of this file is such that the first card is a TITLE card followed immediately by an EARTH card and then as many GCOEF or GCOEFC and GCOEFS cards as necessary to define all of the spherical harmonic coefficients. All the GCOEFC cards should be together followed by all the GCOEFS cards. Estimation information input on UNIT 12 is ignored.

See GLOBAL SET EARTH, GCOEF, GCOEFC, GCOEFS for detailed description and format. EARTH, GCOEF, GCOEFC and GCOEFS cards on UNIT 05 override information on the same cards on UNIT 12.

NOV 1994

9411.0