61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
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/*
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Define constants used, like the gravitational constant and unit conversions.
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Values are assigned in file constants.c
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All values are in SI units!
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*/
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#ifndef _TESSEROIDS_CONSTANTS_H_
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#define _TESSEROIDS_CONSTANTS_H_
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/* Mean Earth radius [\f$ m \f$] */
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const double MEAN_EARTH_RADIUS = 6378137.0;
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const double EARTH_RADIUS_IGRF_KM = 6371.2;
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/* The gravitational constant [\f$ m^3*kg^{-1}*s^{-1} \f$] */
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const double G = 0.00000000006673;
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/* Conversion factor from SI units to Eotvos
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[\f$ \frac{1}{s^2} = 10^9\ Eotvos \f$] */
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const double SI2EOTVOS = 1000000000.0;
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const double EOTVOS2SI = 0.000000001;
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/* Conversion factor from SI units to mGal
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[\f$ 1 \frac{m}{s^2} = 10^5\ mGal \f$] */
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const double SI2MGAL = 100000.0;
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/* Pi */
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#ifdef __cplusplus
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const double PI = 3.1415926535897932384626433832795;
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#else
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#define PI 3.1415926535897932384626433832795
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#endif
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/* minimum distance-to-size ratio for potential computations to be accurate */
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const double TESSEROID_POT_SIZE_RATIO = 1.5;
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/* Minimum distance-to-size ratio for gravity computations to be accurate */
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const double TESSEROID_GX_SIZE_RATIO = 3;
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const double TESSEROID_GY_SIZE_RATIO = 3;
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const double TESSEROID_GZ_SIZE_RATIO = 2;
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/* Minimum distance-to-size ratio for gravity gradient computations to be
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accurate */
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const double TESSEROID_GXX_SIZE_RATIO = 3;
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const double TESSEROID_GXY_SIZE_RATIO = 4.5;
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const double TESSEROID_GXZ_SIZE_RATIO = 4;
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const double TESSEROID_GYY_SIZE_RATIO = 3;
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const double TESSEROID_GYZ_SIZE_RATIO = 4;
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const double TESSEROID_GZZ_SIZE_RATIO = 3;
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const double M_0 = 4 * (PI) * 0.0000001;
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const double DEG2RAD = (PI)/180.0;
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#define FALSE 0
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#define TRUE 1
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#endif
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