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海域重力异常模型的多尺度分析

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不同于传统的重力异常模型精度分析方法,本文以马里亚纳海沟区域(140°E-150°E,10°N-20°N)为例,利用DOG球面小波提取了DTU10、DTU17和SIO V32.1模型在不同波段内的重力异常信号,对模型间的差异进行了深入分析,并对基于径向基函数的不同深度、不同分辨率的多尺度分析进行了尝试.利用DOG球面小波对各模型多尺度分析的结果表明,随着尺度变小,模型间的差异在变大;DTU10、DTU17模型间的差异主要集中在10.9～43.6 km的波段内,分布在海岸、海沟、海底山附近,体现了Cryosat-2、Jason-1/GM观测数据和FES2014海潮模型的贡献;受模型构建方法不同、观测数据增多和波形重跟踪的影响,DTU17、SIO V32.1模型的差异大于DTU10、DTU17之间的差异.对传统径向基函数进行了改进,实现了多深度、多空间分辨率情况下径向基函数多尺度分析,结果略优于单一深度、单一空间分辨率径向基函数构建结果,有望应用于多源数据的重力场模型构建.
Multi-scale analysis of gravity anomaly models in sea area
Different from the traditional analysis method for gravity anomaly models,DOG(difference of Gauss)spherical wavelet is used to extract the gravity anomaly signals of DTU10,DTU17 and SIO V32.1 models in different bands for Mariana Trench area(140 °E-150°E,10°N-20°N)as an example.The differences between the models are analyzed in depth.An ini-tial attempt of multi-scale analysis in different depths and different resolutions based on RBF(radial basis function)are pro-posed.The results of multi-scale analysis using DOG spherical wavelet show that as the scale becomes smaller,the difference between the models becomes larger.The differences between DTU10 and DTU17 models are mainly concentrated in the band of 10.9-43.6 km,around the coast,trench and submarine mountain,which reflects the contribution of Cryosat-2,Jason-1/GM observation data and FES2014 ocean tide model.Due to the different methods for model construction,the increase of ob-servations and the impact of waveform retracking,the difference between DTU17 and SIO V32.1 models is greater than that between DTU10 and DTU17.The traditional radial basis function is improved,and the multi-scale analysis of radial basis func-tion under multi-depth and multi-spatial resolution is realized.The result is slightly better than that from single-depth and sin-gle-spatial resolution radial basis function.It is expected to be applied to the construction of gravity field model using multi-source data.

satellite altimetrygravity anomaly modelspherical waveletradial basis functionmulti-scale analysis

刘焕玲、杨蔚然、张放、文汉江、胡敏章、蒋涛、蔺文奇、黎晨曦

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中国测绘科学研究院,北京 100036

武汉引力与固体潮国家野外科学观测研究站,湖北武汉 430071

武汉大学测绘学院,湖北武汉 430079

湖南省测绘科技研究所,湖南长沙 410007

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卫星测高 重力异常模型 球面小波 径向基函数 多尺度分析

国家重点研发计划国家重点研发计划国家自然科学基金武汉引力与固体潮国家野外科学观测研究站开放研究基金资助项目中国测绘科学研究院基本科研业务费湖南省自然资源厅科技项目

2021YFB39002002021YFB390020342074020WHYWZ202213AR230320230166CH

2024

10.11947/j.AGCS.2024.20230309

测绘学报
中国测绘学会

测绘学报

CSTPCD北大核心
影响因子：1.602
ISSN：1001-1595
年,卷(期)：2024.53(2)
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