[Proj] triaxial ellipsoid

Charles Karney charles.karney at sri.com
Thu Oct 18 12:51:40 EST 2012

On 2012-10-18 12:40, Aleksander Yanovskiy wrote:
> And I have a question concerning it: your equatorial axes longitudes are (-15,165 and -105,75), but Chen et all., 2010 (doi:10.1029/2009JB007094) got (−14.928509 and -104,928509). And other reseachers (although not with EGM2008) got (-14,9289 and -104,9289) Marchenko, 2009 (DOI: 10.1007/978-3-540-85426-5_57); (−14.93 and -104,93) Matsuyama, 2010 (doi:10.1029/2009JB006564). (I have transformed their results according to yours). So my question is which calculation is more accurate ?

My calculation was very much a "back-of-the-envelope" one comparing the
rough order of magnitude of the triaxial term relative to the others.
It's most likely that the other papers you cite give more accurate
results (but I haven't checked these papers!).


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