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the accurate and effective measurement between the wire and the tree crown can effectively prevent the failure related to the vegetation and ensure the safe and stable operation of the power system. In view of the difficulty of tree obstacle measurement in the power corridor, a method based on the space three solution technology is proposed. By taking a front photo of the power line corridor area and using the overlapping feature points of the image, the direction elements of each photo can be calculated. According to the principle of air triangulation, pixel matching algorithm is used to calculate the dense point cloud data in the measurement area, which can be used to make statistics on the measurement of tree obstacles, and then calculate the value of tree obstacles. The experimental results show that the space three solution method can achieve the measurement of the transmission line barrier value, and the measurement error can meet the needs of measuring the distance between trees and transmission lines.