EGM2008 is said to be a tides-free gravitational model. What is mean by tides-free model?
The meaning is explained in a paper written by Botai et al (2014) "Investigating the effect of tide parameterization and gravity field models on SLR solution". This paper deals with the case of gravity field derived from SLR data but the concept of tides effect is applicable much the same in the case of gravity mission satellite.
The paper by Botai is available here - link.
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