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18 lines
567 B
C++
18 lines
567 B
C++
#pragma once
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#include "geometry/latlon.hpp"
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namespace ms
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{
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// Returns area of triangle on earth.
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double AreaOnEarth(LatLon const & ll1, LatLon const & ll2, LatLon const & ll3);
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// Area of the spherical cap that contains all points
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// within the distance |radius| from an arbitrary fixed point, measured
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// along the Earth surface.
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// In particular, the smallest cap spanning the whole Earth results
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// from radius = pi*EarthRadius.
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// For small enough radiuses, returns the value close to pi*|radius|^2.
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double CircleAreaOnEarth(double radius);
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} // namespace ms
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