How do I convert ECI coordinates to longitude latitude and altitude to...

vegan_vicky

I would like to be more specific about what I want to do. I get coordinates in ECI and I need to get the latitude and longitude from this. How can I do? I was searching but I could'nt find anything about it. Thanks again. (I'm doing a small program in java that shows the position of a satellite in a given time. So, I used the NORAD SGP algorithm, and I have the position (x,y,z) and velocity(Vx,Vy,Vz). But the coordinates system used by this...

Originally asked by voodoo14 on Stack Exchange (stackoverflow) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

What you want to do is called ECI/ECEF (cartessian) to Geodetic (lat/lon) conversion. This conversion is the most complex of all the geodetic conversions as the closed form solution is complicated. See page 34 of Stevens and Lewis, Aircraft Control and Simulation for a discussion of the coordinate systems: http://books.google.com/books/about/Aircraft_control_and_simulation.html?id=T0Ux6av4btIC ECI to geodetic is a two step process: The first step is the easiest in that you need to convert ECI (earth centered inertial) to ECEF (earth centered/earth fixed). The second step is to convert ECEF to geodetic. You can read about solving this via Newton-Ralphson here:...

Full answer by TreyA: https://stackoverflow.stackexchange.com/a/9431242 (CC BY-SA 3.0).

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