# Fwd: [gsoc17] Regarding Boost.Geometry

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## Fwd: [gsoc17] Regarding Boost.Geometry

 Hi I am Aditya Gupta, IInd Yr. B. Tech. Computer Science at IIT Ropar and I wish to work on Project 3 of Boost.Geometry (Nearly antipodal points distance accuracy improvement.) I have completed the competency test , but I think maybe it was too small or have I misinterpreted, anyways. I have an initial draft of my [GSoC proposal](https://gist.github. com/adityagupta1089/39863577e1716c55d86c98ff57623893) I have also attached my CV. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost cv.pdf (98K) Download Attachment
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## Re: Fwd: [gsoc17] Regarding Boost.Geometry

 Hi Aditya, Aditya Gupta Via Boost wrote: > Hi I am Aditya Gupta, IInd Yr. B. Tech. Computer Science at IIT Ropar and I > wish to work on Project 3 of Boost.Geometry (Nearly antipodal points > distance accuracy improvement.) > > I have completed the competency test > , but I think maybe it > was too small or have I misinterpreted, anyways. So you used a sphere as a model of the Earth, haversine formula to calculate distance and compared it with Boost.Geometry spherical_equatorial coordinate system. Try comparing it with Boost.Geometry geographic coordinate system. Is the result the same? Why nearly antipodal points may be problematic? Furthermore there are 3 various ways of calculating geographic distance in Boost.Geometry but they are not documented yet. In Boost.Geometry it's possible to specify how the algorithm calculates cordinate-system-specific parts by passing a strategy into a function as the last argument. By default, if you don't pass a strategy the algorithm use the default one (corresponding to the coordinate system of the pased Geometries). So if you passed geographic points one of the geographic strategies would be used. See also this line of a unit test as an example, here the distance is calculated with one of the strategies passed explicitly into distance() algorithm: https://github.com/boostorg/geometry/blob/develop/test/strategies/vincenty.cpp#L185Regards, Adam _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost