Implement tidal corrections

JuliaAstro / EarthOrientation.jl

Calculate Earth orientation parameters from IERS tables in Julia

MIT License

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Implement tidal corrections #6

Open helgee opened 6 years ago

helgee commented 6 years ago

References:

https://github.com/astropy/astropy/issues/1803#issuecomment-30270616
http://maia.usno.navy.mil/iers-gaz13
ftp://hpiers.obspm.fr/iers/models/interp.f

bgodard commented 5 years ago

Related, I see that the interpolation used is Akima interpolation. I guess this is: http://www.iue.tuwien.ac.at/phd/rottinger/node60.html Is there a particular reason for this choice? The references in OP use Lagrange polynomial interpolation degree 4.

helgee commented 5 years ago

I think I observed overshooting in other interpolations methods and thus chose Akima's method because it is fully local. But I do not remember it clearly. I am testing against the source method: https://github.com/JuliaAstro/EarthOrientation.jl/blob/master/test/runtests.jl#L18