Libosmium: include/osmium/geom/haversine.hpp Source File

Libosmium Fast and flexible C++ library for working with OpenStreetMap data

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haversine.hpp
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1#ifndef OSMIUM_GEOM_HAVERSINE_HPP
2#define OSMIUM_GEOM_HAVERSINE_HPP
3
4/*
5
6This file is part of Osmium (https://osmcode.org/libosmium).
7
8Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
9
10Boost Software License - Version 1.0 - August 17th, 2003
11
12Permission is hereby granted, free of charge, to any person or organization
13obtaining a copy of the software and accompanying documentation covered by
14this license (the "Software") to use, reproduce, display, distribute,
15execute, and transmit the Software, and to prepare derivative works of the
16Software, and to permit third-parties to whom the Software is furnished to
17do so, all subject to the following:
18
19The copyright notices in the Software and this entire statement, including
20the above license grant, this restriction and the following disclaimer,
21must be included in all copies of the Software, in whole or in part, and
22all derivative works of the Software, unless such copies or derivative
23works are solely in the form of machine-executable object code generated by
24a source language processor.
25
26THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32DEALINGS IN THE SOFTWARE.
33
34*/
35
36#include <osmium/geom/coordinates.hpp>
37#include <osmium/geom/util.hpp>
38#include <osmium/osm/node_ref_list.hpp>
39#include <osmium/osm/way.hpp>
40
41#include <cmath>
42#include <iterator>
43
44namespace osmium {
45
46 namespace geom {
47
56 namespace haversine {
57
59 constexpr const double EARTH_RADIUS_IN_METERS = 6372797.560856;
60
66 inline double distance(const osmium::geom::Coordinates& c1, const osmium::geom::Coordinates& c2) noexcept {
67 double lonh = std::sin(deg_to_rad(c1.x - c2.x) * 0.5);
68 lonh *= lonh;
69 double lath = std::sin(deg_to_rad(c1.y - c2.y) * 0.5);
70 lath *= lath;
71 const double tmp = std::cos(deg_to_rad(c1.y)) * std::cos(deg_to_rad(c2.y));
72 return 2.0 * EARTH_RADIUS_IN_METERS * std::asin(std::sqrt(lath + (tmp * lonh)));
73 }
74
78 inline double distance(const osmium::WayNodeList& wnl) {
79 double sum_length = 0;
80
81 for (const auto* it = wnl.begin(); it != wnl.end(); ++it) {
82 if (std::next(it) != wnl.end()) {
83 sum_length += distance(it->location(), std::next(it)->location());
84 }
85 }
86
87 return sum_length;
88 }
89
93 inline double distance(const osmium::NodeRefList& nrl) {
94 double sum_length = 0;
95
96 for (const auto* it = nrl.begin(); it != nrl.end(); ++it) {
97 if (std::next(it) != nrl.end()) {
98 sum_length += distance(it->location(), std::next(it)->location());
99 }
100 }
101
102 return sum_length;
103 }
104
105 } // namespace haversine
106
107 } // namespace geom
108
109} // namespace osmium
110
111#endif // OSMIUM_GEOM_HAVERSINE_HPP
osmium::NodeRefList
Definition node_ref_list.hpp:52
osmium::NodeRefList::begin
iterator begin() noexcept
Returns an iterator to the beginning.
Definition node_ref_list.hpp:199
osmium::NodeRefList::end
iterator end() noexcept
Returns an iterator to the end.
Definition node_ref_list.hpp:204
osmium::WayNodeList
Definition way.hpp:55
coordinates.hpp
util.hpp
osmium::geom::haversine
Functions to calculate arc distance on Earth using the haversine formula.
Definition haversine.hpp:56
osmium::geom::haversine::distance
double distance(const osmium::geom::Coordinates &c1, const osmium::geom::Coordinates &c2) noexcept
Definition haversine.hpp:66
osmium::geom::haversine::EARTH_RADIUS_IN_METERS
constexpr const double EARTH_RADIUS_IN_METERS
Earth's quadratic mean radius for WGS84.
Definition haversine.hpp:59
osmium::geom
Everything related to geometry handling.
Definition coordinates.hpp:46
osmium::geom::deg_to_rad
constexpr double deg_to_rad(double degree) noexcept
Convert angle from degrees to radians.
Definition util.hpp:64
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
node_ref_list.hpp
osmium::geom::Coordinates
Definition coordinates.hpp:48
way.hpp