openpilot0/common/transformations/coordinates.cc

101 lines
2.8 KiB
C++

#define _USE_MATH_DEFINES
#include "common/transformations/coordinates.hpp"
#include <iostream>
#include <cmath>
#include <eigen3/Eigen/Dense>
double a = 6378137; // lgtm [cpp/short-global-name]
double b = 6356752.3142; // lgtm [cpp/short-global-name]
double esq = 6.69437999014 * 0.001; // lgtm [cpp/short-global-name]
double e1sq = 6.73949674228 * 0.001;
static Geodetic to_degrees(Geodetic geodetic){
geodetic.lat = RAD2DEG(geodetic.lat);
geodetic.lon = RAD2DEG(geodetic.lon);
return geodetic;
}
static Geodetic to_radians(Geodetic geodetic){
geodetic.lat = DEG2RAD(geodetic.lat);
geodetic.lon = DEG2RAD(geodetic.lon);
return geodetic;
}
ECEF geodetic2ecef(Geodetic g){
g = to_radians(g);
double xi = sqrt(1.0 - esq * pow(sin(g.lat), 2));
double x = (a / xi + g.alt) * cos(g.lat) * cos(g.lon);
double y = (a / xi + g.alt) * cos(g.lat) * sin(g.lon);
double z = (a / xi * (1.0 - esq) + g.alt) * sin(g.lat);
return {x, y, z};
}
Geodetic ecef2geodetic(ECEF e){
// Convert from ECEF to geodetic using Ferrari's methods
// https://en.wikipedia.org/wiki/Geographic_coordinate_conversion#Ferrari.27s_solution
double x = e.x;
double y = e.y;
double z = e.z;
double r = sqrt(x * x + y * y);
double Esq = a * a - b * b;
double F = 54 * b * b * z * z;
double G = r * r + (1 - esq) * z * z - esq * Esq;
double C = (esq * esq * F * r * r) / (pow(G, 3));
double S = cbrt(1 + C + sqrt(C * C + 2 * C));
double P = F / (3 * pow((S + 1 / S + 1), 2) * G * G);
double Q = sqrt(1 + 2 * esq * esq * P);
double r_0 = -(P * esq * r) / (1 + Q) + sqrt(0.5 * a * a*(1 + 1.0 / Q) - P * (1 - esq) * z * z / (Q * (1 + Q)) - 0.5 * P * r * r);
double U = sqrt(pow((r - esq * r_0), 2) + z * z);
double V = sqrt(pow((r - esq * r_0), 2) + (1 - esq) * z * z);
double Z_0 = b * b * z / (a * V);
double h = U * (1 - b * b / (a * V));
double lat = atan((z + e1sq * Z_0) / r);
double lon = atan2(y, x);
return to_degrees({lat, lon, h});
}
LocalCoord::LocalCoord(Geodetic g, ECEF e){
init_ecef << e.x, e.y, e.z;
g = to_radians(g);
ned2ecef_matrix <<
-sin(g.lat)*cos(g.lon), -sin(g.lon), -cos(g.lat)*cos(g.lon),
-sin(g.lat)*sin(g.lon), cos(g.lon), -cos(g.lat)*sin(g.lon),
cos(g.lat), 0, -sin(g.lat);
ecef2ned_matrix = ned2ecef_matrix.transpose();
}
NED LocalCoord::ecef2ned(ECEF e) {
Eigen::Vector3d ecef;
ecef << e.x, e.y, e.z;
Eigen::Vector3d ned = (ecef2ned_matrix * (ecef - init_ecef));
return {ned[0], ned[1], ned[2]};
}
ECEF LocalCoord::ned2ecef(NED n) {
Eigen::Vector3d ned;
ned << n.n, n.e, n.d;
Eigen::Vector3d ecef = (ned2ecef_matrix * ned) + init_ecef;
return {ecef[0], ecef[1], ecef[2]};
}
NED LocalCoord::geodetic2ned(Geodetic g) {
ECEF e = ::geodetic2ecef(g);
return ecef2ned(e);
}
Geodetic LocalCoord::ned2geodetic(NED n){
ECEF e = ned2ecef(n);
return ::ecef2geodetic(e);
}