GAAS

#ifndef GPS_EXPAND_H
#define GPS_EXPAND_H

class GPSExpand
{

public:

    void expandAt(double lon_deg,double lat_deg,double alt)
    {
      this->center_lon = lon_deg;
      this->center_lat = lat_deg;
      this->center_alt = alt;
    }

    inline double vari_km_per_lat_deg()                                           
    {
        return earth_radius_km*pi_/180;
    }

    inline double vari_km_per_lon_deg()
    {
        return vari_km_per_lat_deg()*cos(center_lat*pi_/180);
    }

    inline double getLon()
    {
        return this->center_lon;
    }

    inline double getLat()
    {
        return this->center_lat;
    }

    inline double getAlt()
    {
        return this->center_alt;
    }

private:

    double center_lon;
    double center_lat;
    double center_alt;
    const double earth_radius_km = 6371.393;
    const double pi_ = 3.1415926535;

};
#endif