Abstract: The acquisition of inland underwater and nearshore topographic data is helpful for comprehensive development and refined management of inland waters, and has important social, economic and ecological significance. Aiming at the problem that a single data acquisition is difficult to meet the complex terrain measurement, this paper proposes a multi-source data acquisition method, which adopts aerial photography, airborne LiDAR, multi-beam and single-beam bathymetry system, artificial measurement and other methods to acquire multi-source data. Data processing obtains terrain data that comprehensively covers underwater, near-shore, and land-water junctions. This paper takes Nishan reservoir as an example for experimental application. The results show that the method in this paper not only realizes the acquisition of integrated topographic data on water and underwater, but also ensures the reliability of the accuracy of the measurement results. If can be widely used in large and medium-sized reservoir survey project to provide technical support for inland underwater and nearshore topographic survey.

Key words: DEM, inland underwater and nearshore, multi-source data fusion, underwater topographic survey, Nishan reservoir