I'm trying to convert ECEF (Earth Centered, Earth Fixed) coordinates, which are defined in X,Y,Z, centered at (0,0,0) to LLA (Latitude, Longitude, Altitude). There are a couple of methods I found on the internet (please let me know if there are better methods). Both are clearly described in this document, on pages 3-4:
One uses an iterative method and the other is a closed form solution. I would like to know which method to use for my application. Two relevant criteria are speed (computation time) and accuracy. The algorithms aren't difficult to implement, but I don't think it's straightforward to compare the two... For example, I feel like accuracy will vary by the input ECEF coordinate.
So does anyone have more information about each method? It would be great if I could get which one is faster (guessing closed form) and a rough accuracy I can expect from each (ie, within how many meters of the actual LLA can I expect my answer to be or something along those lines).