Aiming at the problems such as low efficiency,high labor intensity and subjective factors of the traditional method of determining the calculation range of cut-fill in open-pit mine,based on the point cloud data collected by unmanned aerial vehicle LIDAR,an algorithm to determine the calculation range of cut-fill in open-pit is proposed.The algorithm divides the point cloud into grids,then sets parameters such as height difference and connected area to extract the point cloud that meets the calculation range of cut-fill in open-pit mine,and finally extracts its contour line to form the boundary line of cut-fill area.The algorithm is applied to extract the calculation range of the two phase point cloud of Nanfen Open-pit Mine.The results show that the output boundary line and point clouds coincide well with the 3D model,which provides an accurate calculation range for the two phase point cloud.
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