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For a program I have to calculate the height according to EGM96. I found http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html - this site delivers files with parameters and a fortran-program. But I feel unable to understand what is going on in this Fortran-program and have no idea how to use the parameters to generate the correct height. Can someone explain the algorithm to me?

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Which Fortran program? The one that interpolates values on a grid (intpt.f) or the one that sums spherical harmonics (f477.f)? – whuber♦ Oct 14 '11 at 16:56
I don't even get, which one calculate the heights for me. – Mnementh Oct 18 '11 at 7:53
They both do, but they do it in (completely) different ways. – whuber♦ Oct 18 '11 at 13:48

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