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
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38 // DEALINGS IN THE SOFTWARE.
40 #ifndef BOOST_GEOMETRY_PROJECTIONS_MERC_HPP
41 #define BOOST_GEOMETRY_PROJECTIONS_MERC_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/factory_entry.hpp>
46 #include <boost/geometry/srs/projections/impl/pj_msfn.hpp>
47 #include <boost/geometry/srs/projections/impl/pj_param.hpp>
48 #include <boost/geometry/srs/projections/impl/pj_phi2.hpp>
49 #include <boost/geometry/srs/projections/impl/pj_tsfn.hpp>
50 #include <boost/geometry/srs/projections/impl/projects.hpp>
52 #include <boost/geometry/util/math.hpp>
54 namespace boost { namespace geometry
59 #ifndef DOXYGEN_NO_DETAIL
60 namespace detail { namespace merc
63 static const double epsilon10 = 1.e-10;
65 template <typename T, typename Parameters>
66 struct base_merc_ellipsoid
68 // FORWARD(e_forward) ellipsoid
69 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
70 inline void fwd(Parameters const& par, T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
72 static const T half_pi = detail::half_pi<T>();
74 if (fabs(fabs(lp_lat) - half_pi) <= epsilon10) {
75 BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
77 xy_x = par.k0 * lp_lon;
78 xy_y = - par.k0 * log(pj_tsfn(lp_lat, sin(lp_lat), par.e));
81 // INVERSE(e_inverse) ellipsoid
82 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
83 inline void inv(Parameters const& par, T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
85 if ((lp_lat = pj_phi2(exp(- xy_y / par.k0), par.e)) == HUGE_VAL) {
86 BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
88 lp_lon = xy_x / par.k0;
91 static inline std::string get_name()
93 return "merc_ellipsoid";
98 template <typename T, typename Parameters>
99 struct base_merc_spheroid
101 // FORWARD(s_forward) spheroid
102 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
103 inline void fwd(Parameters const& par, T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
105 static const T half_pi = detail::half_pi<T>();
106 static const T fourth_pi = detail::fourth_pi<T>();
108 if (fabs(fabs(lp_lat) - half_pi) <= epsilon10) {
109 BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
111 xy_x = par.k0 * lp_lon;
112 xy_y = par.k0 * log(tan(fourth_pi + .5 * lp_lat));
115 // INVERSE(s_inverse) spheroid
116 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
117 inline void inv(Parameters const& par, T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
119 static const T half_pi = detail::half_pi<T>();
121 lp_lat = half_pi - 2. * atan(exp(-xy_y / par.k0));
122 lp_lon = xy_x / par.k0;
125 static inline std::string get_name()
127 return "merc_spheroid";
133 template <typename Params, typename Parameters>
134 inline void setup_merc(Params const& params, Parameters& par)
136 typedef typename Parameters::type calc_t;
137 static const calc_t half_pi = detail::half_pi<calc_t>();
142 if( (is_phits = pj_param_r<srs::spar::lat_ts>(params, "lat_ts", srs::dpar::lat_ts, phits)) ) {
144 if (phits >= half_pi)
145 BOOST_THROW_EXCEPTION( projection_exception(error_lat_ts_larger_than_90) );
147 if (par.es != 0.0) { /* ellipsoid */
149 par.k0 = pj_msfn(sin(phits), cos(phits), par.es);
150 } else { /* sphere */
156 }} // namespace detail::merc
160 \brief Mercator projection
162 \tparam Geographic latlong point type
163 \tparam Cartesian xy point type
164 \tparam Parameters parameter type
165 \par Projection characteristics
169 \par Projection parameters
170 - lat_ts: Latitude of true scale (degrees)
172 \image html ex_merc.gif
174 template <typename T, typename Parameters>
175 struct merc_ellipsoid : public detail::merc::base_merc_ellipsoid<T, Parameters>
177 template <typename Params>
178 inline merc_ellipsoid(Params const& params, Parameters & par)
180 detail::merc::setup_merc(params, par);
185 \brief Mercator projection
187 \tparam Geographic latlong point type
188 \tparam Cartesian xy point type
189 \tparam Parameters parameter type
190 \par Projection characteristics
194 \par Projection parameters
195 - lat_ts: Latitude of true scale (degrees)
197 \image html ex_merc.gif
199 template <typename T, typename Parameters>
200 struct merc_spheroid : public detail::merc::base_merc_spheroid<T, Parameters>
202 template <typename Params>
203 inline merc_spheroid(Params const& params, Parameters & par)
205 detail::merc::setup_merc(params, par);
209 #ifndef DOXYGEN_NO_DETAIL
214 BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI2(srs::spar::proj_merc, merc_spheroid, merc_ellipsoid)
217 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI2(merc_entry, merc_spheroid, merc_ellipsoid)
219 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(merc_init)
221 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(merc, merc_entry)
224 } // namespace detail
227 } // namespace projections
229 }} // namespace boost::geometry
231 #endif // BOOST_GEOMETRY_PROJECTIONS_MERC_HPP