cdd_getters_common.h

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/*
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Copyright (c) 2023-2025 Institute for Automotive Engineering (ika), RWTH Aachen University
 
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#ifndef ETSI_ITS_MSGS_UTILS_IMPL_CDD_CDD_GETTERS_COMMON_H
#define ETSI_ITS_MSGS_UTILS_IMPL_CDD_CDD_GETTERS_COMMON_H
 
#include <array>
#include <cmath>
#include <cstdint>
#include <GeographicLib/UTMUPS.hpp>
 
inline uint32_t getStationID(const ItsPduHeader& header) { return header.station_id.value; }
 
inline double getLatitude(const Latitude& latitude) { return ((double)latitude.value) * 1e-7; }
 
inline double getLongitude(const Longitude& longitude) { return ((double)longitude.value) * 1e-7; }
 
inline double getAltitude(const Altitude& altitude) { return ((double)altitude.altitude_value.value) * 1e-2; }
 
inline double getSpeed(const Speed& speed) { return ((double)speed.speed_value.value) * 1e-2; }
 
inline double getSpeedConfidence(const Speed& speed) {
  return ((double)speed.speed_confidence.value) / etsi_its_msgs::ONE_D_GAUSSIAN_FACTOR * 1e-2;
}
 
template <typename T>
inline gm::PointStamped getUTMPosition(const T& reference_position, int& zone, bool& northp) {
  gm::PointStamped utm_point;
  double latitude = getLatitude(reference_position.latitude);
  double longitude = getLongitude(reference_position.longitude);
  utm_point.point.z = getAltitude(reference_position.altitude);
  try {
    GeographicLib::UTMUPS::Forward(latitude, longitude, zone, northp, utm_point.point.x, utm_point.point.y);
    std::string hemisphere;
    if (northp) {
      hemisphere = "N";
    } else {
      hemisphere = "S";
    }
    utm_point.header.frame_id = "utm_" + std::to_string(zone) + hemisphere;
  } catch (GeographicLib::GeographicErr& e) {
    throw std::invalid_argument(e.what());
  }
  return utm_point;
}
 
template <typename Heading>
inline double getHeadingCDD(const Heading& heading) { return ((double)heading.heading_value.value) * 1e-1; }
 
template <typename Heading>
inline double getHeadingConfidenceCDD(const Heading& heading) { return ((double)heading.heading_confidence.value) * 1e-1 / etsi_its_msgs::ONE_D_GAUSSIAN_FACTOR; }
 
template <typename SemiAxisLength>
inline double getSemiAxis(const SemiAxisLength& semi_axis_length) {
  return ((double)semi_axis_length.value) * 1e-2 / etsi_its_msgs::OneCentimeterHelper<SemiAxisLength>::value;
}
 
template <typename PosConfidenceEllipse>
inline std::tuple<double, double, double> getPosConfidenceEllipse(const PosConfidenceEllipse& position_confidence_ellipse) {
  return {
    getSemiAxis(position_confidence_ellipse.semi_major_confidence),
    getSemiAxis(position_confidence_ellipse.semi_minor_confidence),
    position_confidence_ellipse.semi_major_orientation.value * 1e-1
  };
}
 
inline std::array<double, 4> CovMatrixFromConfidenceEllipse(double semi_major, double semi_minor, double major_orientation, const double object_heading) {
  std::array<double, 4> covariance_matrix;
  double semi_major_squared = semi_major * semi_major / (etsi_its_msgs::TWO_D_GAUSSIAN_FACTOR * etsi_its_msgs::TWO_D_GAUSSIAN_FACTOR);
  double semi_minor_squared = semi_minor * semi_minor / (etsi_its_msgs::TWO_D_GAUSSIAN_FACTOR * etsi_its_msgs::TWO_D_GAUSSIAN_FACTOR);
  double major_orientation_rad = major_orientation * M_PI / 180;
  double object_heading_rad = object_heading;
  
  double angle_to_object = object_heading_rad - major_orientation_rad;
 
  double cos_angle = std::cos(angle_to_object);
  double sin_angle = std::sin(angle_to_object);
  covariance_matrix[0] = semi_major_squared * cos_angle * cos_angle + semi_minor_squared * sin_angle * sin_angle;
  covariance_matrix[1] = (semi_major_squared - semi_minor_squared) * cos_angle * sin_angle;
  covariance_matrix[2] = covariance_matrix[1];
  covariance_matrix[3] = semi_major_squared * sin_angle * sin_angle + semi_minor_squared * cos_angle * cos_angle;
 
  return covariance_matrix;
}
 
inline std::array<double, 4> WGSCovMatrixFromConfidenceEllipse(double semi_major, double semi_minor, double major_orientation) {
  // The WGS covariance matrix is the same as in vehicle coordinates, if it would have a heading of 0.0
  return CovMatrixFromConfidenceEllipse(semi_major, semi_minor, major_orientation, 0.0);
}
 
template <typename PosConfidenceEllipse>
inline std::array<double, 4> getPosConfidenceEllipse(const PosConfidenceEllipse& position_confidence_ellipse, const double object_heading){
  auto [semi_major, semi_minor, major_orientation] = getPosConfidenceEllipse(position_confidence_ellipse);
  return CovMatrixFromConfidenceEllipse(semi_major, semi_minor, major_orientation, object_heading);
}
 
template <typename PosConfidenceEllipse>
inline std::array<double, 4> getWGSPosConfidenceEllipse(const PosConfidenceEllipse& position_confidence_ellipse){
  auto [semi_major, semi_minor, major_orientation] = getPosConfidenceEllipse(position_confidence_ellipse);
  return WGSCovMatrixFromConfidenceEllipse(semi_major, semi_minor, major_orientation);
}
 
#endif  // ETSI_ITS_MSGS_UTILS_IMPL_CDD_CDD_GETTERS_COMMON_H