Abstract:Accompanying with the increasingly obvious role of reservoirs in economic and social development, the government pays more attention to the development and management of reservoirs. It becomes more urgent to obtain highprecision underwater topographic data of reservoirs. Accompanying with the development of the bathymetry technology, differential GNSS technology and attitude sensor, the sounding system based on GNSS provides a new solution for underwater topographic survey. Through reasonable planning of survey line, sound speed correction and draft correction, navigation and positioning of ship borne GNSS, and collection of sounding data by depth sounder, the underwater topographic survey results can be quickly generated after transformation and processing. Taking Dongping Lake Reservoir in Shandong province as an example, technical methods and solutions of spatial threedimensional coordinate positioning has been studied based on Shandong satellite positioning continuous operation integrated application service system (hereinafter referred to as SDCORS) and quasi geoid refined model. By using single beam bathymeter for water depth measurement, and generating underwater elevation points and digital elevation model through data processing has been generated. It can provide some references for such projects.
