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\[\gamma = \frac {(\,a\gamma_{e}\cos^{2}\psi+b\gamma_{p}\sin^{2}\psi)}{\sqrt{a^{2}\cos^{2}\psi + b^{2}\sin^{2}\psi}}\] \(a\)は地球の赤道半径=6,378,137[m]、\(b\)は極半径=6,356,752[m]、\(\gamma_{e}\)は赤道における正規重力=978.032677[Gal]、\(\gamma_{p}\)は極における正規重力=983.218637[Gal]、\(\psi\)は測地緯度[rad]。

\[ \tan \phi = \frac{b^{2}}{a^{2}} \tan \psi\] \(\phi\)は地心緯度、\(\psi\)は測地緯度。