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Message:

> Hello,
> 
> > The desired system is an Mercator projection. 
> 
> The Mercator projection is a map projection, without a defined height component. This allows you to divide your problem into two independent adjustment tasks. Separate your observations into planar observations such as GNSS-2D baselines, which should be projected into the target datum, direction and horizontal distances and adjust the horizontal network. For the height component, adjust a 1D network using the leveling data (and the height differences derived from the zenith angle and the slope distance, and - if required - the z-components of the baseline).
> 
> > Seeing as the height is not referenced to the ellipsoid but rather local orthometric. 
> 
> That's right. However, the ellipsoidal height is approximately the sum of the orthometric height and the geoid height, i.e. h = H + N. The difference is 
> 
> Δh = hA - hb = HA + NA - HB - NB ≈ HA - HB, 
> 
> if NA ≈ NB is assumed, which may valid in small networks. If NA differs significantly from NB, you must correct the geoid heights to combine these heights with your orthometric heights.
> 
> Kind regards
> Micha

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