A Survey of Three-Dimensional Flight Path Planning for Unmanned Aerial Vehicle

The unmanned aerial vehicles (UAVs) have been widely used in various fields in recent years, where the three-dimensional (3D) flight path planning is very important to realize the autonomous flight and complete the desired missions for the UAVs. Although the 3D flight path planning have become an active topic in the filed of the UAVs, there are still several critical problems to be further investigated to the authors' knowledge. Motivated by the aforementioned considerations, the purpose of this survey is to present several representative approaches already proposed in the literature and provide some problems to be further investigated for the 3D flight path planning of the UAVs.