Underwater topography survey and precision analysis based on depth sounder and CORS-RTK technology

Abstract

Underwater topography survey is a basics part of hydrological research, and plays an important role in the development of resources in marine lakes and inland rivers. In this paper, the water depth was measured in some waters of Linyi Beng river by using Real time kinematic (RTK) based Qianxun Continuously Operating Reference System (CORS) services and depth sounder, and the underwater topographic map was obtained. In order to test the accuracy of underwater topographic survey, some of the checkpoints were simultaneously observed by the traditional sounding rope method, and the sounding accuracy of these checkpoints was analyzed. The results show that the average accuracy of the sounding with the CORS-RTK+ sounder is 0.12m, compared with the traditional method, which satisfies the accuracy requirements of underwater topography. On this basis, the items that need attention during the practical sounding are given. The above research results can provide a technical reference for underwater topography survey.