1'×1' vertical deflection and its precision evaluation on china west pacific ocean region

Abstract

Weighted-calcaulation method is designed by combining distance between observing points with height-measurement accuracy. With weighted least squares and the Vening-Meinesz formula,two 1'×1' digital vertical deflection grid models on a certain West Pacific Ocean region (0°N-40°N,105°E-145°E) are respectively constructed by use of multiple altimetry data and gravity anomaly,and the two models are compared to EGM2008 on two chosen typical regions. The results show that, the prime vertical component η is slightly larger than the meridian component ξ, and the root mean square error of derived vertical deflection on Southern China Sea where there is the complex seafloor topography is larger than the middle of West Pacific ocean. In addition, the root mean square error of two constructed models are generally less than 1.6".