Abstract: The terrain environment of lake wetlands is complex,and a single measurement method is difficult to meet the requirements of high-precision terrain data acquisition and high-precision three-dimensional expression.This paper proposes a multi-source collaborative measurement method,which uses unmanned boats for single-beam depth sounding,unmanned aerial vehicles (UAVs)for LiDAR height measurement,and combines GNSS and depth rods for supplementary measurement in small areas to achieve efficient,high-precision,and high-density data collection of water and land terrain.Based on the vector boundary of the water area,the constrained Delaunay triangulation algorithm is adopted to seamlessly integrate and smoothly transition the water and underwater terrain data,constructing a high-precision water-land integrated digital elevation model (DEM),and then establishing a surface water storage calculation model.The research results show that the collaborative application of multiple measurement technologies can significantly improve the data collection efficiency and accuracy of the water-land integrated DEM.This method can provide reliable technical support for water resources investigation,management,and sustainable utilization.

Key words: unmanned vessel single-beam sounding, airborne LiDAR, water-land integrated DEM, water storage capacity, computational model construction