Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method

The use of satellite altimetry to recover marine gravity anomalies allows for the rapid acquisition seafloor topography on a wide range regional scales. Currently, commonly used approaches inverting have been focused linear correlation between and disregarded effect density contrast crust seawater depth. Therefore, we proposed variable constraint combined modification (VDTCCM) method by deriving Parker’s formula Bouguer plate introducing factors. This can effectively topography-related nonlinear terms anomalies. Subsequently, South China Sea was estimated applying VDTCCM defined as Seafloor one (ST1), following, accuracy evaluated using shipborne sounding data (SSD). results indicate that ST1 model’s SSD-checked is 23.34% 39.42% higher than common international models ETOPO1 DTU10, respectively. Moreover, model has advantages in mapping rugged areas, showing more detailed topographical features. Consequently, provide beneficial references construction large scale recovered from altimetry.