Since 2010, a slew of new satellite altimetry missions has started providing gravity data generated from altimetry with worldwide coverage and high quality that rivals shipborne gravity measurements in several areas. As a result, worldwide offshore high-resolution gravity fields have considerably improved. This paper aims to compare two altimetry gravity models i.e. DTU21 and SSv29.1 with shipborne gravity measurements to evaluate their accuracies over the Red Sea. At first, the DTU21 and SSv29.1 altimetry models were compared with the shipborne data at different water depths to evaluate the impact of bathymetry depths on the accuracy. The corresponding results revealed that the DTU21 gravity model gave the best results in the comparison of all shipborne with a standard deviation (s.d.) of 7.37 mGal and a Root Mean Square (RMS) of 8.73 mGal, while the SSv29.1 model achieve an s.d. of 8.50 mGal and an RMS of 8.81 mGal. In water depths less than 1000 m the DTU21 model gives the best results in terms of s.d. and RMS, while the SSv29.1 model achieves better results at water depths ranging between 1000 m and 3000 m.

自 2010 年以来，一系列新的卫星测高任务已开始提供由测高产生的重力数据，其覆盖全球且质量高，可在多个领域与船载重力测量相媲美。结果，全球近海高分辨率重力场得到了显着改善。本文旨在将两种测高重力模型即 DTU21 和 SSv29.1 与船载重力测量进行比较，以评估其在红海上空的准确性。首先，将DTU21和SSv29.1测高模型与不同水深的船载数据进行对比，评估测深深度对精度的影响。相应的结果表明，DTU21 重力模型在所有船载的比较中给出了最好的结果，其标准偏差 (sd) 为 7.37 mGal，均方根 (RMS) 为 8.73 mGal，而 SSv29.1 模型的 sd 为 8.50 mGal，RMS 为 8.81 mGal。在小于 1000 m 的水深中，DTU21 模型在 sd 和 RMS 方面的结果最好，而 SSv29.1 模型在 1000 m 到 3000 m 的水深范围内取得了更好的结果。