37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
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/*
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Functions that calculate the gravitational potential and its first and second
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derivatives for the rectangular prism using the formulas in Nagy et al. (2000).
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The coordinate system used is that of the article, ie:
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x -> North y -> East z -> Down
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References
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----------
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* Nagy, D., Papp, G., Benedek, J. (2000): The gravitational potential and its
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derivatives for the prism. Journal of Geodesy, 74, 552–560.
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*/
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#ifndef _TESSEROIDS_GRAV_PRISM_H_
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#define _TESSEROIDS_GRAV_PRISM_H_
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/* Needed for definition of PRISM */
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#include "geometry.h"
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extern double safe_atan2(double y, double x);
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extern double prism_pot(PRISM prism, double xp, double yp, double zp);
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extern double prism_gx(PRISM prism, double xp, double yp, double zp);
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extern double prism_gy(PRISM prism, double xp, double yp, double zp);
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extern double prism_gz(PRISM prism, double xp, double yp, double zp);
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extern double prism_gxx(PRISM prism, double xp, double yp, double zp);
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extern double prism_gxy(PRISM prism, double xp, double yp, double zp);
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extern double prism_gxz(PRISM prism, double xp, double yp, double zp);
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extern double prism_gyy(PRISM prism, double xp, double yp, double zp);
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extern double prism_gyz(PRISM prism, double xp, double yp, double zp);
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extern double prism_gzz(PRISM prism, double xp, double yp, double zp);
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#endif
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