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+// Boost.Geometry
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+
+// This file was modified by Oracle on 2015.
+// Modifications copyright (c) 2015 Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// 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_STRATEGIES_GEOGRAPHIC_THOMAS_HPP
+#define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_THOMAS_HPP
+
+
+#include <boost/geometry/core/coordinate_type.hpp>
+#include <boost/geometry/core/radian_access.hpp>
+
+#include <boost/geometry/strategies/distance.hpp>
+
+#include <boost/geometry/util/promote_floating_point.hpp>
+#include <boost/geometry/util/select_calculation_type.hpp>
+
+#include <boost/geometry/algorithms/detail/thomas_inverse.hpp>
+
+namespace boost { namespace geometry
+{
+
+namespace strategy { namespace distance
+{
+
+/*!
+\brief The solution of the inverse problem of geodesics on latlong coordinates,
+       Forsyth-Andoyer-Lambert type approximation with second order terms.
+\ingroup distance
+\tparam Spheroid The reference spheroid model
+\tparam CalculationType \tparam_calculation
+\author See
+    - Technical Report: PAUL D. THOMAS, MATHEMATICAL MODELS FOR NAVIGATION SYSTEMS, 1965
+      http://www.dtic.mil/docs/citations/AD0627893
+    - Technical Report: PAUL D. THOMAS, SPHEROIDAL GEODESICS, REFERENCE SYSTEMS, AND LOCAL GEOMETRY, 1970
+      http://www.dtic.mil/docs/citations/AD703541
+*/
+template
+<
+    typename Spheroid,
+    typename CalculationType = void
+>
+class thomas
+{
+public :
+    template <typename Point1, typename Point2>
+    struct calculation_type
+        : promote_floating_point
+          <
+              typename select_calculation_type
+                  <
+                      Point1,
+                      Point2,
+                      CalculationType
+                  >::type
+          >
+    {};
+
+    typedef Spheroid model_type;
+
+    inline thomas()
+        : m_spheroid()
+    {}
+
+    explicit inline thomas(Spheroid const& spheroid)
+        : m_spheroid(spheroid)
+    {}
+
+    template <typename Point1, typename Point2>
+    inline typename calculation_type<Point1, Point2>::type
+    apply(Point1 const& point1, Point2 const& point2) const
+    {
+        return geometry::detail::thomas_inverse
+                <
+                    typename calculation_type<Point1, Point2>::type,
+                    true, false
+                >::apply(get_as_radian<0>(point1),
+                         get_as_radian<1>(point1),
+                         get_as_radian<0>(point2),
+                         get_as_radian<1>(point2),
+                         m_spheroid).distance;
+    }
+
+    inline Spheroid const& model() const
+    {
+        return m_spheroid;
+    }
+
+private :
+    Spheroid m_spheroid;
+};
+
+#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+namespace services
+{
+
+template <typename Spheroid, typename CalculationType>
+struct tag<thomas<Spheroid, CalculationType> >
+{
+    typedef strategy_tag_distance_point_point type;
+};
+
+
+template <typename Spheroid, typename CalculationType, typename P1, typename P2>
+struct return_type<thomas<Spheroid, CalculationType>, P1, P2>
+    : thomas<Spheroid, CalculationType>::template calculation_type<P1, P2>
+{};
+
+
+template <typename Spheroid, typename CalculationType>
+struct comparable_type<thomas<Spheroid, CalculationType> >
+{
+    typedef thomas<Spheroid, CalculationType> type;
+};
+
+
+template <typename Spheroid, typename CalculationType>
+struct get_comparable<thomas<Spheroid, CalculationType> >
+{
+    static inline thomas<Spheroid, CalculationType> apply(thomas<Spheroid, CalculationType> const& input)
+    {
+        return input;
+    }
+};
+
+template <typename Spheroid, typename CalculationType, typename P1, typename P2>
+struct result_from_distance<thomas<Spheroid, CalculationType>, P1, P2 >
+{
+    template <typename T>
+    static inline typename return_type<thomas<Spheroid, CalculationType>, P1, P2>::type
+        apply(thomas<Spheroid, CalculationType> const& , T const& value)
+    {
+        return value;
+    }
+};
+
+
+} // namespace services
+#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+
+
+}} // namespace strategy::distance
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_THOMAS_HPP