Created
February 16, 2018 08:56
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SBAS interpolation of ionospheric grid points
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struct rectangle_t { | |
/** | |
* igp[2] -- igp[3] igp[0] -- igp[1] | |
* | | in north, | | in south | |
* igp[0] -- igp[1] igp[2] -- igp[3] | |
* | |
* assumption | |
* igp[0].lat = igp[1].lat, igp[2].lat = igp[3].lat | |
* igp[0].lng < igp[1].lng, igp[2].lng < igp[3].lng | |
*/ | |
position_t igp[4]; | |
float_t weight[4]; | |
void compute_weight(const float_t &delta_lat_from_0, const float_t &delta_lng_from_0){ | |
// (A-25)-(A-32) | |
int_t | |
delta_lng10(igp[1].longitude_deg - igp[0].longitude_deg), | |
delta_lng23(igp[2].longitude_deg - igp[3].longitude_deg); | |
float_t | |
w_lat23(delta_lat_from_0 / (igp[2].latitude_deg - igp[0].latitude_deg)), | |
w_lat01(1. - w_lat23), | |
w_lng32(delta_lng_from_0 / (igp[2].longitude_deg - igp[3].longitude_deg)), | |
w_lng10(delta_lng_from_0 / (igp[1].longitude_deg - igp[0].longitude_deg)); | |
// res = ((1. - w_lng10) * [0] + w_lng10 * [1]) * (1. - w_lat23) + ((1. - w_lng32) * [2] + w_lng32 * [3]) * w_lat23; | |
weight[0] = (1. - w_lng10) * w_lat01; | |
weight[1] = w_lng10 * w_lat01; | |
weight[2] = (1. - w_lng32) * w_lat23; | |
weight[3] = w_lng32 * w_lat23; | |
} | |
}; | |
void interpolate(const float_t &latitude_deg, const float_t &longitude_deg) const { // TODO return type | |
pivot_t base(pivot(latitude_deg, longitude_deg)); | |
if(base.igp.latitude_deg == 85){ | |
}else if(base.igp.latitude_deg == -85){ | |
}else if(base.igp.latitude_deg == 75){ | |
}else if(base.igp.latitude_deg == -75){ | |
}else if(base.igp.latitude_deg >= 60){ | |
}else if(base.igp.latitude_deg <= -60){ | |
}else if(base.igp.latitude_deg >= 0){ | |
}else{ | |
} | |
} |
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