Campbell Scientific CS470/CS471 Compact Bubbler System - Manual (Page 44)

Appendix D. SDI-12 Sensor Support
0.003086 m/s 2 for each kilometer above sea level. With the following formula
the local gravitational constant g in m/s 2 can be calculated:
g = 9.780356 * (1 + 0.0052885 sin 2

-0.0000059 sin 2 2) -0.003086 h
where  is the degrees of latitude and h the height above sea level in km.
(Jursa, A.S., Ed., Handbook of Geophysics and the Space Environment, 4 th ed.,
Air Force Geophysics Laboratory, 1985, pp. 14-17).
Example: At a height above mean sea level of 0.669 km and a latitude of
47.71°, a gravitational constant of 9.80659 m/s 2 results.
D-8