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Shebalin 1980
Shebalin, J.V. (1980). The determination of surface harmonic expansion coefficients from mean gravity anomalies by orthogonal collocation. Journal of Geophysical Research 85: doi: 10.1029/JB085iB04p01809. issn: 0148-0227.

Orthogonal collocation methods are utilized in determining the information content of global mean gravity anomalies. In particular, it is shown that the maximum degree of a spherical harmonic expansion derived from 5 ¿¿5 ¿ (unequal area) mean anomalies is fifty. Also, a practical algorithm is given for determining the coefficients of the expansion which exactly reproduces a set of mean gravity anomaly values.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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