aptdec/satcal.h

const struct {
    float d[4][3];
    struct {
        float vc, A, B;
    } rad[3];
    struct {
        float Ns;
        float b[3];
    } cor[3]; 
/* Calibration corficcients taken from the NOAA KLM satellite user guide
 * https://web.archive.org/web/20141220021557/https://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/tables.htm 
 */
} satcal[] = {
{ // NOAA 15
    { // PRT coefficient d0, d1, d2
        {276.60157, 0.051045, 1.36328E-06},
        {276.62531, 0.050909, 1.47266E-06},
        {276.67413, 0.050907, 1.47656E-06},
        {276.59258, 0.050966, 1.47656E-06}
    },
    { // Channel radiance coefficient vc, A, B
        {925.4075, 0.337810, 0.998719}, // Channel 4
        {839.8979, 0.304558, 0.999024}, // Channel 5
        {2695.9743, 1.621256, 0.998015} // Channel 3B
    },
    { // Nonlinear radiance correction Ns, b0, b1, b2
        {-4.50, {4.76, -0.0932, 0.0004524}}, // Channel 4
        {-3.61, {3.83, -0.0659, 0.0002811}}, // Channel 5
        {0.0, {0.0, 0.0, 0.0}} // Channel 3B
    }
},
{ // NOAA 16
    { // PRT coeff d0, d1, d2
        {276.355, 5.562E-02, -1.590E-05},
        {276.142, 5.605E-02, -1.707E-05},
        {275.996, 5.486E-02, -1.223E-05},
        {276.132, 5.494E-02, -1.344E-05}
    },
    { // Channel radiance coefficient vc, A, B
        {917.2289, 0.332380, 0.998522}, // Channel 4
        {838.1255, 0.674623, 0.998363}, // Channel 5
        {2700.1148, 1.592459, 0.998147} // Channel 3B
    },
    { // Nonlinear radiance correction Ns, b0, b1, b2
        {-2.467, {2.96, -0.05411, 0.00024532}}, // Channel 4
        {-2.009, {2.25, -0.03665, 0.00014854}}, // Channel 5
        {0.0, {0.0, 0.0, 0.0}}  // Channel 3B
    }
},
{ // NOAA 17
    { // PRT coefficient d0, d1, d2
        {276.628, 0.05098, 1.371e-06},
        {276.538, 0.05098, 1.371e-06},
        {276.761, 0.05097, 1.369e-06},
        {276.660, 0.05100, 1.348e-06}
    },
    { // Channel radiance coefficient vc, A, B
        {926.2947, 0.271683, 0.998794}, // Channel 4
        {839.8246, 0.309180, 0.999012}, // Channel 5
        {2669.3554, 1.702380, 0.997378} // Channel 3B
    },
    { // Nonlinear radiance correction Ns, b0, b1, b2
        {-8.55, {8.22, -0.15795, 0.00075579}}, // Channel 4
        {-3.97, {4.31, -0.07318, 0.00030976}}, // Channel 5
        {0.0, {0.0, 0.0, 0.0}} // Channel 3B
    }
},
{ // NOAA 18
    { // PRT coefficient d0, d1, d2
        {276.601, 0.05090, 1.657e-06},
        {276.683, 0.05101, 1.482e-06},
        {276.565, 0.05117, 1.313e-06},
        {276.615, 0.05103, 1.484e-06}
    },
    { // Channel radiance coefficient vc, A, B
        {928.1460, 0.436645, 0.998607}, // Channel 4
        {833.2532, 0.253179, 0.999057}, // Channel 5
        {2659.7952, 1.698704, 0.996960} // Channel 3B
    },
    { // Nonlinear radiance correction Ns, b0, b1, b2
        {-5.53, {5.82, -0.11069, 0.00052337}}, // Channel 4
        {-2.22, {2.67, -0.04360, 0.00017715}}, // Channel 5
        {0.0, {0.0, 0.0, 0.0}} // Channel 3B
    }
},
{ // NOAA 19
    { // PRT coefficient d0, d1, d2
        {276.6067, 0.051111, 1.405783E-06},
        {276.6119, 0.051090, 1.496037E-06},
        {276.6311, 0.051033, 1.496990E-06},
        {276.6268, 0.051058, 1.493110E-06}
    },
    { // Channel radiance coefficient vc, A, B
        {928.9, 0.53959, 0.998534}, // Channel 4
        {831.9, 0.36064, 0.998913}, // Channel 5
        {2670.0, 1.67396, 0.997364} // Channel 3B
    },
    { // Nonlinear radiance correction Ns, b0, b1, b2
        {-5.49, {5.70 	-0.11187, 0.00054668}}, // Channel 4
        {-3.39, {3.58 	-0.05991, 0.00024985}}, // Channel 5
        {0.0, {0.0, 0.0, 0.0}} // Channel 3B
    }
}};

const float c1 = 1.1910427e-5;
const float c2 = 1.4387752;