Line segment intersections

In order to connect together separate GPS tracks and routes, we need to know where they intersect. So we need an algorithm to discover the intersections of a set of line segments, for example, the Bentley-Ottman algorithm. I have not found an implementation in javascript. In C++, the CGAL library has an implementation. All we need now is to use emscripten to generate asm.js from the C++ ...