− | Gravity data as measured must be corrected for the earth's field.<ref name=ch15r2>Chapin, D., A., 1996a, [http://library.seg.org/doi/abs/10.1190/1.1437341 The theory of the Bouguer gravity anomaly: a tutorial]: Leading Edge, May 1996, p. 361–363.</ref> There are five categories of corrections. | + | Gravity data as measured must be corrected for the earth's field.<ref name=ch15r2>Chapin, D. A., 1996a, [http://library.seg.org/doi/abs/10.1190/1.1437341 The theory of the Bouguer gravity anomaly: a tutorial]: Leading Edge, May 1996, p. 361–363.</ref> There are five categories of corrections. |