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_EQDC_HPP
41 #define BOOST_GEOMETRY_PROJECTIONS_EQDC_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_mlfn.hpp>
47 #include <boost/geometry/srs/projections/impl/pj_msfn.hpp>
48 #include <boost/geometry/srs/projections/impl/pj_param.hpp>
49 #include <boost/geometry/srs/projections/impl/projects.hpp>
51 #include <boost/geometry/util/math.hpp>
53 #include <boost/math/special_functions/hypot.hpp>
55 namespace boost { namespace geometry
60 #ifndef DOXYGEN_NO_DETAIL
61 namespace detail { namespace eqdc
64 static const double epsilon10 = 1.e-10;
78 template <typename T, typename Parameters>
79 struct base_eqdc_ellipsoid
81 par_eqdc<T> m_proj_parm;
83 // FORWARD(e_forward) sphere & ellipsoid
84 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
85 inline void fwd(Parameters const& , T lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
89 rho = this->m_proj_parm.c - (this->m_proj_parm.ellips ? pj_mlfn(lp_lat, sin(lp_lat),
90 cos(lp_lat), this->m_proj_parm.en) : lp_lat);
91 xy_x = rho * sin( lp_lon *= this->m_proj_parm.n );
92 xy_y = this->m_proj_parm.rho0 - rho * cos(lp_lon);
95 // INVERSE(e_inverse) sphere & ellipsoid
96 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
97 inline void inv(Parameters const& par, T xy_x, T xy_y, T& lp_lon, T& lp_lat) const
99 static T const half_pi = detail::half_pi<T>();
103 if ((rho = boost::math::hypot(xy_x, xy_y = this->m_proj_parm.rho0 - xy_y)) != 0.0 ) {
104 if (this->m_proj_parm.n < 0.) {
109 lp_lat = this->m_proj_parm.c - rho;
110 if (this->m_proj_parm.ellips)
111 lp_lat = pj_inv_mlfn(lp_lat, par.es, this->m_proj_parm.en);
112 lp_lon = atan2(xy_x, xy_y) / this->m_proj_parm.n;
115 lp_lat = this->m_proj_parm.n > 0. ? half_pi : -half_pi;
119 static inline std::string get_name()
121 return "eqdc_ellipsoid";
127 template <typename Params, typename Parameters, typename T>
128 inline void setup_eqdc(Params const& params, Parameters& par, par_eqdc<T>& proj_parm)
133 proj_parm.phi1 = pj_get_param_r<T, srs::spar::lat_1>(params, "lat_1", srs::dpar::lat_1);
134 proj_parm.phi2 = pj_get_param_r<T, srs::spar::lat_2>(params, "lat_2", srs::dpar::lat_2);
136 if (fabs(proj_parm.phi1 + proj_parm.phi2) < epsilon10)
137 BOOST_THROW_EXCEPTION( projection_exception(error_conic_lat_equal) );
139 proj_parm.en = pj_enfn<T>(par.es);
141 proj_parm.n = sinphi = sin(proj_parm.phi1);
142 cosphi = cos(proj_parm.phi1);
143 secant = fabs(proj_parm.phi1 - proj_parm.phi2) >= epsilon10;
144 if( (proj_parm.ellips = (par.es > 0.)) ) {
147 m1 = pj_msfn(sinphi, cosphi, par.es);
148 ml1 = pj_mlfn(proj_parm.phi1, sinphi, cosphi, proj_parm.en);
149 if (secant) { /* secant cone */
150 sinphi = sin(proj_parm.phi2);
151 cosphi = cos(proj_parm.phi2);
152 proj_parm.n = (m1 - pj_msfn(sinphi, cosphi, par.es)) /
153 (pj_mlfn(proj_parm.phi2, sinphi, cosphi, proj_parm.en) - ml1);
155 proj_parm.c = ml1 + m1 / proj_parm.n;
156 proj_parm.rho0 = proj_parm.c - pj_mlfn(par.phi0, sin(par.phi0),
157 cos(par.phi0), proj_parm.en);
160 proj_parm.n = (cosphi - cos(proj_parm.phi2)) / (proj_parm.phi2 - proj_parm.phi1);
161 proj_parm.c = proj_parm.phi1 + cos(proj_parm.phi1) / proj_parm.n;
162 proj_parm.rho0 = proj_parm.c - par.phi0;
166 }} // namespace detail::eqdc
170 \brief Equidistant Conic projection
172 \tparam Geographic latlong point type
173 \tparam Cartesian xy point type
174 \tparam Parameters parameter type
175 \par Projection characteristics
179 \par Projection parameters
180 - lat_1: Latitude of first standard parallel (degrees)
181 - lat_2: Latitude of second standard parallel (degrees)
183 \image html ex_eqdc.gif
185 template <typename T, typename Parameters>
186 struct eqdc_ellipsoid : public detail::eqdc::base_eqdc_ellipsoid<T, Parameters>
188 template <typename Params>
189 inline eqdc_ellipsoid(Params const& params, Parameters const& par)
191 detail::eqdc::setup_eqdc(params, par, this->m_proj_parm);
195 #ifndef DOXYGEN_NO_DETAIL
200 BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_eqdc, eqdc_ellipsoid)
203 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(eqdc_entry, eqdc_ellipsoid)
205 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(eqdc_init)
207 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(eqdc, eqdc_entry);
210 } // namespace detail
213 } // namespace projections
215 }} // namespace boost::geometry
217 #endif // BOOST_GEOMETRY_PROJECTIONS_EQDC_HPP