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