Dear Mr/Mrs Geodesy Engineer, Cartographers and AIS Specialists

I have a quite deep question here, AIP data locations are determined by geographic coordinates /X & Y axis/ and vertical values /Z axis/ via Geodesy science.

ICAO adopted EGM-96 standard for Vertical Reference System.

Question is raised regarding to Annex-15,

....When a geoid model other than the EGM-96 model is used, a description of the model used, including the parameters required for height transformation between the model and EGM-96, shall be provided in the Aeronautical Information Publication (AIP).

In Mongolia, we are not using EGM-96 for Vertical Reference System. Instead, wWe are using the Baltic sea level value /1940-1970/ in Air Navigation.

My question is: How to figure out the parameters required for height transformation between any model and EGM-96 for AIP publication? In my thinking, the parameters must contain following values: ∆X, ∆ Y, ∆ Z, X rotation, Y rotation, Z rotation, Scale... etc. Is this correct?

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    $\begingroup$ Interesting question, and I think it is on topic. However, I would expect this question will get better answers at gis.stackexchange.com, $\endgroup$ – DeltaLima May 1 '19 at 8:12
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    $\begingroup$ The few thousand different projections that exist and transforming between them is a problem GIS professionals deal a lot more frequently than pilots. As @DeltaLima has suggested, you're much more likely to get a good answer at gis.stackexchange.com. $\endgroup$ – Therac May 1 '19 at 17:10