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30 lines
908 B
C++
30 lines
908 B
C++
#include "geometry/distance_on_sphere.hpp"
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#include "base/math.hpp"
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#include <algorithm>
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#include <cmath>
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namespace ms
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{
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double DistanceOnSphere(double lat1Deg, double lon1Deg, double lat2Deg, double lon2Deg)
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{
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double const lat1 = base::DegToRad(lat1Deg);
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double const lat2 = base::DegToRad(lat2Deg);
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double const dlat = sin((lat2 - lat1) * 0.5);
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double const dlon = sin((base::DegToRad(lon2Deg) - base::DegToRad(lon1Deg)) * 0.5);
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double const y = dlat * dlat + dlon * dlon * cos(lat1) * cos(lat2);
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return 2.0 * atan2(sqrt(y), sqrt(std::max(0.0, 1.0 - y)));
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}
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double DistanceOnEarth(double lat1Deg, double lon1Deg, double lat2Deg, double lon2Deg)
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{
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return kEarthRadiusMeters * DistanceOnSphere(lat1Deg, lon1Deg, lat2Deg, lon2Deg);
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}
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double DistanceOnEarth(LatLon const & ll1, LatLon const & ll2)
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{
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return DistanceOnEarth(ll1.m_lat, ll1.m_lon, ll2.m_lat, ll2.m_lon);
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}
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} // namespace ms
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