说明：  computes the gravitational acceleration vector at a specified ％ ECF location using the JGM2 gravitational ellipsoid only. ％ Higher-order gravity terms (the "gravity anomaly") are ％ ingnored. Only the pure ellipsoid is used.
(computes the gravitational acceleration vector at a specified ECF location using the JGM2 gravitational ellipsoid only. Higher-order gravity terms (the gravity anomaly ) are ingnored. Only the pure ellipsoid is used.)