Digital Bathymetric Models Fusion Using Vertical Gravity Gradient: A Bayesian Approach

This fused digital bathymetric model (DBM) is constructed by the DTU18, ETOPO2022, GEBCO2024, SRTM15+v2.6, and Topo27.1 models in the North Pacific Ocean. It spans longitudes 130E ~ -130W, and latitudes 0N ~ 50N. By accurately estimating the contributions of different DBMs, the fusion method used can naturally incorporate the marine gravity field as auxiliary prior information into the existing DBMs, enhancing the reliability and robustness of the fused model. The accuracy of this fused DBM is significantly improved in multiple dimensions. It achieves an average accuracy improvement of 9.63%, 7.83%, 9.46%, 7.87%, and 15.49% over DTU18, ETOPO2022, GEBCO2024, SRTM15+v2.6, and Topo27.1, respectively, based on the empirical studies.