Abstract: In the process of mine ecological restoration, large-scale calculation of earth and rock quantity is involved, and the calculation of earth and rock quantity can usually adopt two methods: scatter method or digital elevation model method. With the development of UAV aerial survey technology, scatter method is also called point cloud method. This paper aims at the reliability of calculation accuracy of earth and rock in the process of ecological restoration in mines. In this paper, the point cloud data of UAV aerial survey data is used to establish the triangulation irregular network model by taking the terrain property line as the characteristic line, giving full play to the advantages of easy operation and many applicable software. This paper studies the method of building the calculation model of soil and rock volume, and verifies the accuracy by comparing and analyzing the calculation results of DEM data, and obtains the complete model building method, so as to get the calculation results of soil and rock volume quickly and accurately, which has great popularization value.

Key words: mine ecological restoration, point cloud data, triangular model, square volume calculation model, precision analysis