1 // Boost.Geometry - gis-projections (based on PROJ4)
3 // Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
5 // This file was modified by Oracle on 2017, 2018, 2019.
6 // Modifications copyright (c) 2017-2019, Oracle and/or its affiliates.
7 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle.
9 // Use, modification and distribution is subject to the Boost Software License,
10 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
11 // http://www.boost.org/LICENSE_1_0.txt)
13 // This file is converted from PROJ4, http://trac.osgeo.org/proj
14 // PROJ4 is originally written by Gerald Evenden (then of the USGS)
15 // PROJ4 is maintained by Frank Warmerdam
16 // PROJ4 is converted to Boost.Geometry by Barend Gehrels
18 // Last updated version of proj: 5.0.0
20 // Original copyright notice:
22 // Copyright (c) 2003 Gerald I. Evenden
24 // Permission is hereby granted, free of charge, to any person obtaining a
25 // copy of this software and associated documentation files (the "Software"),
26 // to deal in the Software without restriction, including without limitation
27 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
28 // and/or sell copies of the Software, and to permit persons to whom the
29 // Software is furnished to do so, subject to the following conditions:
31 // The above copyright notice and this permission notice shall be included
32 // in all copies or substantial portions of the Software.
34 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
35 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
36 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
37 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
38 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
39 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
40 // DEALINGS IN THE SOFTWARE.
42 #ifndef BOOST_GEOMETRY_PROJECTIONS_STEREA_HPP
43 #define BOOST_GEOMETRY_PROJECTIONS_STEREA_HPP
45 #include <boost/math/special_functions/hypot.hpp>
47 #include <boost/geometry/srs/projections/impl/base_static.hpp>
48 #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
49 #include <boost/geometry/srs/projections/impl/projects.hpp>
50 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
51 #include <boost/geometry/srs/projections/impl/pj_gauss.hpp>
54 namespace boost { namespace geometry
59 #ifndef DOXYGEN_NO_DETAIL
60 namespace detail { namespace sterea
72 template <typename T, typename Parameters>
73 struct base_sterea_ellipsoid
75 par_sterea<T> m_proj_parm;
77 // FORWARD(e_forward) ellipsoid
78 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
79 inline void fwd(Parameters const& par, T lp_lon, T lp_lat, T& xy_x, T& xy_y) const
81 T cosc, sinc, cosl_, k;
83 detail::gauss_fwd(m_proj_parm.en, lp_lon, lp_lat);
87 k = par.k0 * this->m_proj_parm.R2 / (1. + this->m_proj_parm.sinc0 * sinc + this->m_proj_parm.cosc0 * cosc * cosl_);
88 xy_x = k * cosc * sin(lp_lon);
89 xy_y = k * (this->m_proj_parm.cosc0 * sinc - this->m_proj_parm.sinc0 * cosc * cosl_);
92 // INVERSE(e_inverse) ellipsoid
93 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
94 inline void inv(Parameters const& par, T xy_x, T xy_y, T& lp_lon, T& lp_lat) const
100 if((rho = boost::math::hypot(xy_x, xy_y)) != 0.0) {
101 c = 2. * atan2(rho, this->m_proj_parm.R2);
104 lp_lat = asin(cosc * this->m_proj_parm.sinc0 + xy_y * sinc * this->m_proj_parm.cosc0 / rho);
105 lp_lon = atan2(xy_x * sinc, rho * this->m_proj_parm.cosc0 * cosc -
106 xy_y * this->m_proj_parm.sinc0 * sinc);
108 lp_lat = this->m_proj_parm.phic0;
111 detail::gauss_inv(m_proj_parm.en, lp_lon, lp_lat);
114 static inline std::string get_name()
116 return "sterea_ellipsoid";
121 // Oblique Stereographic Alternative
122 template <typename Parameters, typename T>
123 inline void setup_sterea(Parameters const& par, par_sterea<T>& proj_parm)
127 proj_parm.en = detail::gauss_ini(par.e, par.phi0, proj_parm.phic0, R);
128 proj_parm.sinc0 = sin(proj_parm.phic0);
129 proj_parm.cosc0 = cos(proj_parm.phic0);
130 proj_parm.R2 = 2. * R;
133 }} // namespace detail::sterea
137 \brief Oblique Stereographic Alternative projection
139 \tparam Geographic latlong point type
140 \tparam Cartesian xy point type
141 \tparam Parameters parameter type
142 \par Projection characteristics
147 \image html ex_sterea.gif
149 template <typename T, typename Parameters>
150 struct sterea_ellipsoid : public detail::sterea::base_sterea_ellipsoid<T, Parameters>
152 template <typename Params>
153 inline sterea_ellipsoid(Params const& , Parameters const& par)
155 detail::sterea::setup_sterea(par, this->m_proj_parm);
159 #ifndef DOXYGEN_NO_DETAIL
164 BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_sterea, sterea_ellipsoid)
167 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(sterea_entry, sterea_ellipsoid)
169 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(sterea_init)
171 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(sterea, sterea_entry)
174 } // namespace detail
177 } // namespace projections
179 }} // namespace boost::geometry
181 #endif // BOOST_GEOMETRY_PROJECTIONS_STEREA_HPP