Abstract: With the advent of information society, modern water resources surveying and mapping has developed from traditional surveying and mapping to information surveying and mapping. Application of UAV technology in surveying and mapping industry promotes the process of informatization surveying and mapping. This paper discusses how to effectively use UAV technology to solve the problems encountered in the field of surveying and mapping in mountainous areas. Fixed-wing UAV can acquire the digital orthophoto image data of the ground in time to capture the plane and elevation problems of the bare ground, but the elevation information of the ground under vegetation coverage can not be obtained. At this time, LiDAR point cloud data under vegetation coverage can be obtained by airborne LiDAR. Combining the two data, the three-dimensional surface model generated by EPS software can quickly obtain the topographic and topographic data of any surveying area, which not only improves the efficiency of water resources surveying and mapping, but also reduces the intensity of field work.

Key words: UAV, orthophoto data, LiDAR data, three-dimensional surface model, information surveying and mapping