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You look for a library able to compute geographical data (distance, ellipsoids, polygones, bounds, track lengths...), the solution is TsGeo... 
TsGeo is an adaptation of phpgeo by Marcus Jaschen.
TsGeo is developed in order to have a simple solution to do geographical operation for TypeScript projects, language used in recent mobile projects (Angular, Ionic, ...)
You can:
- Define a coordinate, ellipsoid line, ellipsoid polyline (for GPS tracker) or ellipsoid polygon (area).
- Do several operations (distance calculation, bounds, perimeter, ...)
- Format the output in Decimal Degrees, Decimal Minutes, DMS, GeoJSON
The library is available under MIT lisense and you can contribute to the development of this library. 
The documentation of TsGeo is available here.
See you on the next article... 
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