The multi-rotor unmanned aerial vehicles(UAVs)have been widely used in the power system patrol inspection. In this study
a 3D GIS-based patrol trajectory planning system of UAV was proposed based on the electromagnetic field interference researches.The influences of the power frequency electromagnetic field on the UAV fuselage and airborne equipment were calculated
and the minimum safe flight distance was determined. The minimum safe distance
the 3D line tower model and the patrol task related information were used to realize 3D GISbased UAV patrol trajectory planning
trajectory tracking
and manual navigation.Practical application verified the importance of the trajectory planning to the patrol inspection.