// Boost.Geometry (aka GGL, Generic Geometry Library) // QuickBook Example // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. // Use, modification and distribution is subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //[length_with_strategy //`The following example shows the length measured over a sphere, expressed in kilometers. To do that the radius of the sphere must be specified in the constructor of the strategy. #include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/linestring.hpp> int main() { using namespace boost::geometry; typedef model::point<float, 2, cs::spherical_equatorial<degree> > P; model::linestring<P> line; line.push_back(P(2, 41)); line.push_back(P(2, 48)); line.push_back(P(5, 52)); double const mean_radius = 6371.0; /*< [@http://en.wikipedia.org/wiki/Earth_radius Wiki] >*/ std::cout << "length is " << length(line, strategy::distance::haversine<float>(mean_radius) ) << " kilometers " << std::endl; return 0; } //] //[length_with_strategy_output /*` Output: [pre length is 1272.03 kilometers ] */ //]