### Goddard gravity model

**(GGM, Goddard gravitational model)**
(gravity model produced by Goddard Space Flight Center)

The term **Goddard gravity model**
(or **Goddard gravitational model**) refers to models of
gravitational anomalies
(termed **gravity models** or **gravitational models**
or **geopotential models**)
of bodies developed by the Goddard Space Flight Center
through data from space probes.
These include successive versions of
**Goddard Lunar Gravity Models**,
**Goddard Earth Gravity Models** and
**Goddard Mars Gravity Models** (**Goddard Mars Models**, or **GMMs**))
One way of expressing them is with spherical harmonics.

(*gravity,science*)
http://en.wikipedia.org/wiki/Geopotential_model

http://en.wikipedia.org/wiki/EGM96

https://pgda.gsfc.nasa.gov/products/50

https://pgda.gsfc.nasa.gov/products/57

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