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Message:

> Hello,
> 
> > I would like to do a hybrid adjustment in JAG3D combining Total station observation od 3D traverse, Leveling data and GNSS vectors. Now, GNSS vectors are derived from TBC, and proccesed in WGS84 coordinate system. I was thinking of using the WGS84 system for the whole adjustment, and then transforming the resulting coordinates into my desired system.
> 
> What is the desired system, and is it not possible to use this system to perform the adjustment process?
> 
> > Firstly, how does the height data derived from total station observation compare to leveling data in the software? 
> 
> Depending on the network design and dimensions, the data from the total station can be used directly. If the data refers to a real spatial network, it is not necessary to divide the raw observations (directions, zenith angles, slope distances) it into a horizontal part (direction and horizontal distances) and a height part (height differences). Moreover, each observation has its own individual uncertainty, which is used to derive a specific weight within the adjustment procedure. It is up to you and your specific weights to increase the impact of the leveling data w.r.t. the total station data.
> 
> > Secondly, how will the leveling data combine with the adjustment? I would have a reference point with the height of the local site (my height system that I desire to have my final heights in)  but the coordinates and GNSS vectors are in another system as specified before (WGS84). Can this adjustment compute? 
> 
> Perhaps, but usually not, because you have to define a uniform datum, and - as far as I understand your explanation - this requirement is probably not fulfilled in your case. 
> 
> 
> Kind regards
> Micha

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