Abstract: In order to overcome the shortcomings of low efficiency and poor accuracy of traditional earthwork measurement technology，based on the analysis of oblique photography technology，an earth⁃ work mapping technology based on UAV oblique photography is proposed. Taking UAV tilt photography as the core，the three-dimensional feature images of the target area are extracted from five dimensions of four tilts and one vertical，and the efficient and rapid measurement of earthwork is realized by constructing earthwork model. The practical application shows that the surveying and mapping accuracy of the new highprecision earthwork measurement technology is about ± 0.81 % compared with the traditional grid method， which can shorten the time of earthwork measurement by 72.4 % and reduce the cost by 88.6 %. It effective⁃ ly reduces the labor intensity of surveying and mapping personnel and improves the efficiency of surveying and mapping.

Key words: earthwork surveying, UAV oblique photography, three-dimensional feature image