Existing Airports: which is the way to build the *.btg file

Hello everybody,
 i have just built (Linux) the last CVS Terragear with NURBS++
I am a very beginner in using Terragear.


I would like, to rebuild in the FG scenery some existing Airports  which
are not up to date regarding the last apt.dat.

Is it anyway with Terragear functions to do it from:

 1/the existing fg-scenery ie:    2990761.btg from e002n48
 2/the existing good apt.dat ie: LFPO

The target is to get a new LFPO.btg


As far in understand i need the DEM file, i hope to be wrong.

BTW: I have found others Airports which are wrong.


Thanks

Gerard


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