The invention discloses an unmanned aerial vehicle tree
diameter measuring method based on an
optical flow method. A tree board, an unmanned aerial vehicle and
data processing equipment are used as measuring devices to measure and calculate the tree
diameter, and the tree board is used for marking the number of a tree and the measuring position of the
diameter at breast height; the unmanned aerial vehicle is provided with a
monocular lens and an
ultrasonic sensor, the
monocular lens is used for shooting tree boards and tree trunks, and the
ultrasonic sensor is used for keeping the unmanned aerial vehicle and the tree boards at corresponding heights; the
data processing equipment is used for planning the
route of the unmanned aerial vehicle, detecting tree boards in videos shot by the unmanned aerial vehicle, identifying numbers of the tree boards, and measuring the
diameter at breast height of a
tree trunk where the tree boards are located based on an
optical flow method to complete tree
diameter measurement. According to the method, the tree diameter can be measured quickly and accurately in batches in a high-
automation mode, the method is easy to operate, manpower and time are greatly saved, the efficiency and accuracy of large-scale tree
diameter measurement are improved, a complete tree diameter
database is established, management and calling are convenient, and according to the tree diameter measuring and calculating method based on the
optical flow method, the calculation precision is guaranteed while only a small number of calculation resources are needed.