Under CopyrightHebel, MarcusMarcusHebelArens, M.M.ArensStilla, U.U.Stilla2022-03-1117.9.20092009https://publica.fraunhofer.de/handle/publica/36266210.24406/publica-fhg-362662en004670526Utilization of 3D city models and airborne laser scanning for terrain-based navigation of helicopters and UAVsconference paper