https://svn.boost.org/trac10/ticket/13510 <p> Hi, </p> <p> When calculating intersections between 2 polygons, the boost::geometry::intersection is giving wrong results in Boost-1.61 version, where as it is giving correct results in Boost-1.55 version. Here i am attaching the code snippet </p> <pre class="wiki">#include &lt;boost/geometry/geometries/point_xy.hpp&gt; #include &lt;boost/geometry/geometries/polygon.hpp&gt; #include &lt;boost/geometry.hpp&gt; typedef boost::geometry::model::d2::point_xy&lt;double&gt; point; typedef boost::geometry::model::ring&lt;point&gt; ring; typedef boost::geometry::model::polygon&lt;point&gt; Polygon; int main() { Polygon p1; Polygon p2; ring r1; ring r2; r1.push_back(point(0.112, -105.2361)); r1.push_back(point(-0.6946, -53.2131)); r1.push_back(point(-0.2526, 0.9022)); r1.push_back(point(86.4137, 0.8264)); r1.push_back(point(179.5712, 0.0198)); r1.push_back(point(180.78110000, -51.1967)); r1.push_back(point(182.3942, -104.4295)); r1.push_back(point(90.0432, -104.8328)); r1.push_back(point(0.112, -105.2361)); p1.outer() = r1; boost::geometry::correct(p1); r1.clear(); r1.push_back(point(-10.7918213256483, 54.2140961455332)); r1.push_back(point(113.309785590778, -17.5321453530258)); r1.push_back(point(17.8097208933718, -86.8545273414985)); r1.push_back(point(-72.8426247838616, -20.4407767651296)); r1.push_back(point(-10.7918213256483, 54.2140961455332)); r2.push_back(point(33.8071936599424, 20.2800630043229)); r2.push_back(point(-28.7283817002881, -38.3773371397694)); r2.push_back(point(12.4772299711817, -63.1007041426512)); r2.push_back(point(64.8325953890491, 4.28259023775226)); r2.push_back(point(33.8071936599424, 20.2800630043229)); p2.inners().push_back(r2); p2.outer() = r1; boost::geometry::correct(p2); std::vector&lt;Polygon&gt; intersections; boost::geometry::intersection(p1, p2, intersections); return 0; } </pre><p> The 2nd point in the intersection result i.e 1st index in "interesections" is wrong. </p> <p> there is a difference of (0.00002) which will reduce the accuracy in computations. </p> <p> Boost-1.55 version: intersections<a class="changeset" href="https://svn.boost.org/trac10/changeset/1" title="Import core sources for SVNmanger 0.38 ">[1]</a> = (-0.66354193, -55.21624099) </p> <p> Boost-1.61 version: intersections<a class="changeset" href="https://svn.boost.org/trac10/changeset/1" title="Import core sources for SVNmanger 0.38 ">[1]</a> = (-0.66356150523, -55.216229256) </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/13510 Trac 1.4.3