diff --git a/include/boost/geometry/extensions/gis/projections/proj/gn_sinu.hpp b/include/boost/geometry/extensions/gis/projections/proj/gn_sinu.hpp
index 329a89776..aae623eca 100644
--- a/include/boost/geometry/extensions/gis/projections/proj/gn_sinu.hpp
+++ b/include/boost/geometry/extensions/gis/projections/proj/gn_sinu.hpp
@@ -202,6 +202,28 @@ namespace boost { namespace geometry { namespace projections
         }} // namespace detail::gn_sinu
     #endif // doxygen
 
+    /*!
+        \brief General Sinusoidal Series projection
+        \ingroup projections
+        \tparam Geographic latlong point type
+        \tparam Cartesian xy point type
+        \tparam Parameters parameter type
+        \par Projection characteristics
+         - Pseudocylindrical
+         - Spheroid
+         - m= n=
+        \par Example
+        \image html ex_gn_sinu.gif
+    */
+    template <typename Geographic, typename Cartesian, typename Parameters = parameters>
+    struct gn_sinu_ellipsoid : public detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>
+    {
+        inline gn_sinu_ellipsoid(const Parameters& par) : detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>(par)
+        {
+            detail::gn_sinu::setup_gn_sinu(this->m_par, this->m_proj_parm);
+        }
+    };
+
     /*!
         \brief Sinusoidal (Sanson-Flamsteed) projection
         \ingroup projections
@@ -224,6 +246,48 @@ namespace boost { namespace geometry { namespace projections
         }
     };
 
+    /*!
+        \brief Eckert VI projection
+        \ingroup projections
+        \tparam Geographic latlong point type
+        \tparam Cartesian xy point type
+        \tparam Parameters parameter type
+        \par Projection characteristics
+         - Pseudocylindrical
+         - Spheroid
+        \par Example
+        \image html ex_eck6.gif
+    */
+    template <typename Geographic, typename Cartesian, typename Parameters = parameters>
+    struct eck6_ellipsoid : public detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>
+    {
+        inline eck6_ellipsoid(const Parameters& par) : detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>(par)
+        {
+            detail::gn_sinu::setup_eck6(this->m_par, this->m_proj_parm);
+        }
+    };
+
+    /*!
+        \brief McBryde-Thomas Flat-Polar Sinusoidal projection
+        \ingroup projections
+        \tparam Geographic latlong point type
+        \tparam Cartesian xy point type
+        \tparam Parameters parameter type
+        \par Projection characteristics
+         - Pseudocylindrical
+         - Spheroid
+        \par Example
+        \image html ex_mbtfps.gif
+    */
+    template <typename Geographic, typename Cartesian, typename Parameters = parameters>
+    struct mbtfps_ellipsoid : public detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>
+    {
+        inline mbtfps_ellipsoid(const Parameters& par) : detail::gn_sinu::base_gn_sinu_ellipsoid<Geographic, Cartesian, Parameters>(par)
+        {
+            detail::gn_sinu::setup_mbtfps(this->m_par, this->m_proj_parm);
+        }
+    };
+
     /*!
         \brief General Sinusoidal Series projection
         \ingroup projections
diff --git a/include/boost/geometry/extensions/gis/projections/proj/stere.hpp b/include/boost/geometry/extensions/gis/projections/proj/stere.hpp
index a6418574f..c057db69a 100644
--- a/include/boost/geometry/extensions/gis/projections/proj/stere.hpp
+++ b/include/boost/geometry/extensions/gis/projections/proj/stere.hpp
@@ -407,6 +407,29 @@ namespace boost { namespace geometry { namespace projections
         }
     };
 
+    /*!
+        \brief Universal Polar Stereographic projection
+        \ingroup projections
+        \tparam Geographic latlong point type
+        \tparam Cartesian xy point type
+        \tparam Parameters parameter type
+        \par Projection characteristics
+         - Azimuthal
+         - Spheroid
+         - Ellipsoid
+         - south
+        \par Example
+        \image html ex_ups.gif
+    */
+    template <typename Geographic, typename Cartesian, typename Parameters = parameters>
+    struct ups_spheroid : public detail::stere::base_stere_spheroid<Geographic, Cartesian, Parameters>
+    {
+        inline ups_spheroid(const Parameters& par) : detail::stere::base_stere_spheroid<Geographic, Cartesian, Parameters>(par)
+        {
+            detail::stere::setup_ups(this->m_par, this->m_proj_parm);
+        }
+    };
+
     #ifndef DOXYGEN_NO_DETAIL
     namespace detail
     {