Hello Lucia,

I can't understand how set as known the height of the reference benchmarks.

Points with known heights are called reference points in JAG3D. So, if you have at least one point with known height, import this or these point(s) as reference(s).

I suppose I have to use datum points 1D

Datum points are unknown points like new points but such points are used to define the datum of the frame.

Regards
Micha