Selv

Provided the correct GM and Omega, it will use SGRAV.TXT file to create the surface elevation (same as geoid).

Files (Required)

SGRAV.TXT

Input - stdin

This is sometimes contained in MGRAV.IN
What it asks for

   GM (km^3/s^2), Omega (deg/day)
     1.728e10
     1617.250674

Output

some large negative number (e.g. -65890511.606425241)
SHAPEFILES/GEOID.TXT - gives the geoid in X, Y, Z position. A 3 column file.
SHAPEFILES/SHAPEC.TXT - gives the height above the surface. A 4 column file.