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 // Permission is hereby granted, free of charge, to any person obtaining a
23 // copy of this software and associated documentation files (the "Software"),
24 // to deal in the Software without restriction, including without limitation
25 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
26 // and/or sell copies of the Software, and to permit persons to whom the
27 // Software is furnished to do so, subject to the following conditions:
29 // The above copyright notice and this permission notice shall be included
30 // in all copies or substantial portions of the Software.
32 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
33 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
34 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
35 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
36 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
37 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
38 // DEALINGS IN THE SOFTWARE.
40 #ifndef BOOST_GEOMETRY_PROJECTIONS_FAHEY_HPP
41 #define BOOST_GEOMETRY_PROJECTIONS_FAHEY_HPP
43 #include <boost/geometry/srs/projections/impl/base_static.hpp>
44 #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
45 #include <boost/geometry/srs/projections/impl/projects.hpp>
46 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
47 #include <boost/geometry/srs/projections/impl/aasincos.hpp>
49 namespace boost { namespace geometry
54 #ifndef DOXYGEN_NO_DETAIL
55 namespace detail { namespace fahey
58 static const double tolerance = 1e-6;
60 template <typename T, typename Parameters>
61 struct base_fahey_spheroid
63 // FORWARD(s_forward) spheroid
64 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
65 inline void fwd(Parameters const& , T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
67 xy_x = tan(0.5 * lp_lat);
68 xy_y = 1.819152 * xy_x;
69 xy_x = 0.819152 * lp_lon * asqrt(1 - xy_x * xy_x);
72 // INVERSE(s_inverse) spheroid
73 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
74 inline void inv(Parameters const& , T const& xy_x, T xy_y, T& lp_lon, T& lp_lat) const
77 lp_lat = 2. * atan(xy_y);
78 xy_y = 1. - xy_y * xy_y;
79 lp_lon = fabs(xy_y) < tolerance ? 0. : xy_x / (0.819152 * sqrt(xy_y));
82 static inline std::string get_name()
84 return "fahey_spheroid";
90 template <typename Parameters>
91 inline void setup_fahey(Parameters& par)
96 }} // namespace detail::fahey
100 \brief Fahey projection
102 \tparam Geographic latlong point type
103 \tparam Cartesian xy point type
104 \tparam Parameters parameter type
105 \par Projection characteristics
109 \image html ex_fahey.gif
111 template <typename T, typename Parameters>
112 struct fahey_spheroid : public detail::fahey::base_fahey_spheroid<T, Parameters>
114 template <typename Params>
115 inline fahey_spheroid(Params const& , Parameters & par)
117 detail::fahey::setup_fahey(par);
121 #ifndef DOXYGEN_NO_DETAIL
126 BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_fahey, fahey_spheroid)
129 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(fahey_entry, fahey_spheroid)
131 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(fahey_init)
133 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(fahey, fahey_entry);
136 } // namespace detail
139 } // namespace projections
141 }} // namespace boost::geometry
143 #endif // BOOST_GEOMETRY_PROJECTIONS_FAHEY_HPP