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I track relative positions to known fixed reference location (Lat/Lon/Alt on WGS 84).

Which means Location_0 is the above reference location, and Location_i is something like (X,Y,Z) relative by definition to Location_0 under ECEF convention (one can think about something like INS/IMU system).

I can obtain Location_i (Lat, Lon, Alt) from (X,Y,Z) with ECEF & NED conversions.

But if the "distance" (for the sake of simplicity let's relax the definition of what exactly I mean by 'distance') between Location_0 & Location_i going as far as hundreds of kilometers etc. ECEF & NED assumptions not enough and I need to work with WGS 84.

How can I track positions calculated under ECEF NED assumption relatively to known referenced point on WGS84, and then convert them to WGS84?

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    Asking for "best practices" suggests that you are seeking a list of things that you should do or be aware of which makes this too broad for focused Q&A. Can you focus your question more? – PolyGeo Jan 16 '17 at 19:46
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    @PolyGeo Edited – michael Jan 16 '17 at 20:11
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    Can you assume that these longer distances are on or near the surface of the ellipsoid? Then convert Location_0 to WGS84, then use a solution to the direct / first problem of geodesy (given point, azimuth, distance, calc 2nd point). May need to find a geodesic solution that includes heights. – mkennedy Jan 17 '17 at 0:59
  • @mkennedy Yes you can assume the locstions are 'on the ground' – michael Jan 17 '17 at 4:50

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