Hello
         I have actual aircraft data ( latitude,longitude,altitude,pitch angle ,roll angle and yaw angle ) .These six parameters i am giving input to FlightGear and i am trying to fly the aircraft but it is hitting hills and going inside ground level.
thats why i want to ask about terrain database.
and what reference you are using to create terrain(eg. SRTM, NED etc ).


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With Regards
Pankaj