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为了评估最新全球重力数据库V23中陆域重力资料的质量问题,选择了美国、秘鲁、爱尔兰、南非、肯尼亚、澳大利亚、中国等7个国家的8个区块约133万km2的重力数据进行对比分析。基于V23中自由空间重力异常数据,利用纯球坐标系内重力校正方法获得了这些区块的计算布格重力异常。利用相关分析的方法对这些区块的实测布格重力异常和计算布格重力异常进行相关分析,得到了相应的相关系数。通过对实测布格重力异常和计算布格重力异常之间相关系数及差值特征的综合分析,评估了全球重力数据库V23中选取的8个区块重力数据的质量。研究结果表明,斯克里普斯海洋研究所发布的最新全球重力数据库V23中陆域重力资料融合了大量测量年代较早的地面重力数据或者航空重力数据,而近十几年新完成的地面重力资料或者航空重力资料可能未融合进该数据库。具有大量年代较早的地面或者航空重力测量资料的区域,该数据库中陆域重力资料的质量较高,而重力工作程度较低的区域,其资料的质量则较低。
In order to evaluate the quality of the terrestrial gravity data in the latest global gravity database V23, gravity data of about 1.33 million km2 in 8 blocks in 7 countries including the United States, Peru, Ireland, South Africa, Kenya, Australia and China were selected for comparative analysis . Based on the free space gravity anomaly data in V23, the calculated Bouguer gravity anomalies of these blocks are obtained by using the gravity correction method in the pure spherical coordinate system. Correlation analysis was made between the observed Bouguer gravity anomalies and the calculated Bouguer gravity anomalies in these blocks using the correlation analysis method, and the corresponding correlation coefficients were obtained. Through the comprehensive analysis of the correlation coefficient and the difference characteristic between the measured Bouguer gravity anomaly and the calculated Bouguer gravity anomaly, the gravimetric data of eight blocks selected in the global gravity database V23 are evaluated. The results show that the gravity data of the latest global gravity database V23 released by Scripps Research Institute of Oceanology integrates a large amount of ground gravity data or airborne gravity data earlier in the measurement period and the newly completed ground gravity data Or airborne gravity data may not be integrated into the database. Areas with large numbers of older terrestrial or aeromagnetic gravimetric data, which have higher quality of land-based gravity data and less heavily graded regions, have lower data quality.