Marine gravity field modeling using SWOT satellite altimetry datasets over the coastal region of Nigeria

This dataset provides supplementary materials supporting the manuscript “Marine gravity field modeling using SWOT satellite altimetry datasets over the coastal region of Nigeria.” The data enable reproducibility of the analysis and facilitate further research on marine gravity field recovery using satellite altimetry. The dataset consists of the following components: Sea Surface Height (SSH) dataSea surface height measurements derived from SWOT L2 LR, used as the primary input for gravity field modeling. Refined shipborne gravity dataShipborne gravity observations after quality control and preprocessing, serving as reference data for validation and comparison. Corrected SSHSea surface height data after applying cross over corrections. Residual height anomalies from SWOT after cross-over adjustment)Residual anomalies derived from SWOT observations, presented both following cross-over adjustment. Residual height anomalies from SWOT before cross-over adjustment)Residual anomalies derived from SWOT observations, presented both prior to cross-over adjustment. Predicted marine gravity from SWOTMarine gravity anomalies estimated from SWOT-derived altimetry data using the adopted inversion methodology. Differences between gravity models and observationsComparative datasets showing differences between the SWOT-derived gravity anomaly model and existing models (DTU21GRA and SSV29.1), as well as discrepancies relative to shipborne gravity measurements. These datasets are intended to support validation, comparison, and further methodological development in satellite altimetry-based marine gravity field modeling, particularly in coastal and complex regions.本数据集为学术论文《利用SWOT卫星测高数据集开展尼日利亚沿海区域海洋重力场建模》的补充支撑材料，可保障该研究分析的可复现性，并推动基于卫星测高的海洋重力场恢复领域的后续研究。 本数据集包含以下组成部分： 海面高度(Sea Surface Height, SSH)数据：源自SWOT L2 LR级数据的海面高度测量结果，作为重力场建模的核心输入数据。 精细化船载重力数据：经过质量控制与预处理后的船载重力观测数据，作为验证与对比的参考数据集。 校正后海面高度：已完成交叉轨迹校正的海面高度数据。 交叉平差后SWOT残余高程异常：基于SWOT观测数据生成的残余高程异常结果，为完成交叉平差后的数据集。 交叉平差前SWOT残余高程异常：基于SWOT观测数据生成的残余高程异常结果，为未完成交叉平差的数据集。 基于SWOT的预测海洋重力场：采用既定反演方法，由SWOT测高数据估算得到的海洋重力异常场。 重力模型与观测值的差值数据集：包含SWOT反演重力异常模型与现有重力模型（DTU21GRA与SSV29.1）之间的差异，以及与船载重力观测值的偏差对比数据。 本数据集旨在支撑基于卫星测高的海洋重力场建模领域的验证、对比与方法学进一步开发，尤其适用于沿海及复杂地形区域的相关研究。