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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// This file was modified by Oracle on 2014, 2016, 2017, 2018.
+// Modifications copyright (c) 2014-2018 Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_SRS_SPHEROID_HPP
+#define BOOST_GEOMETRY_SRS_SPHEROID_HPP
+
+
+#include <cstddef>
+
+#include <boost/static_assert.hpp>
+
+#include <boost/geometry/core/radius.hpp>
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+
+namespace boost { namespace geometry
+{
+    
+namespace srs
+{
+
+/*!
+    \brief Defines spheroid radius values for use in geographical CS calculations
+    \ingroup srs
+    \note See http://en.wikipedia.org/wiki/Figure_of_the_Earth
+          and http://en.wikipedia.org/wiki/World_Geodetic_System#A_new_World_Geodetic_System:_WGS84
+    \tparam RadiusType tparam_radius
+*/
+template <typename RadiusType>
+class spheroid
+{
+public:
+    spheroid(RadiusType const& a, RadiusType const& b)
+        : m_a(a)
+        , m_b(b)
+    {}
+
+    spheroid()
+        : m_a(RadiusType(6378137.0))
+        , m_b(RadiusType(6356752.3142451793))
+    {}
+
+    template <std::size_t I>
+    RadiusType get_radius() const
+    {
+        BOOST_STATIC_ASSERT(I < 3);
+
+        return I < 2 ? m_a : m_b;
+    }
+
+    template <std::size_t I>
+    void set_radius(RadiusType const& radius)
+    {
+        BOOST_STATIC_ASSERT(I < 3);
+
+        (I < 2 ? m_a : m_b) = radius;
+    }
+
+private:
+    RadiusType m_a, m_b; // equatorial radius, polar radius
+};
+
+} // namespace srs
+
+// Traits specializations for spheroid
+#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
+namespace traits
+{
+
+template <typename RadiusType>
+struct tag< srs::spheroid<RadiusType> >
+{
+    typedef srs_spheroid_tag type;
+};
+
+template <typename RadiusType>
+struct radius_type< srs::spheroid<RadiusType> >
+{
+    typedef RadiusType type;
+};
+
+template <typename RadiusType, std::size_t Dimension>
+struct radius_access<srs::spheroid<RadiusType>, Dimension>
+{
+    typedef srs::spheroid<RadiusType> spheroid_type;
+
+    static inline RadiusType get(spheroid_type const& s)
+    {
+        return s.template get_radius<Dimension>();
+    }
+
+    static inline void set(spheroid_type& s, RadiusType const& value)
+    {
+        s.template set_radius<Dimension>(value);
+    }
+};
+
+} // namespace traits
+#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_SRS_SPHEROID_HPP