利用EGM2008模型估算海洋重力测量测线布设间距  

Estimation of Spacing of Survey Line Layout with EGM2008 Model in Marine Gravity Survey

作　　者：金绍华 李家彪[1] 吴自银[1] 边刚 崔杨 JIN Shaohua;LI Jiabiao;WU Ziyin;BIAN Gang;CUI Yang(Key Laboratory of Submarine Geosciences of SOA,Hangzhou 310012,China;Department of Military Oceanography and Hydrography ＆ Cartography,Dalian Naval Academy,Dalian 116018,China)

机构地区：[1]国家海洋局海底科学重点实验室,浙江杭州310012 [2]海军大连舰艇学院军事海洋与测绘系,辽宁大连116018

出　　处：《武汉大学学报（信息科学版）》2018年第9期1315-1319,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41576105,41374018,41476087)~~

摘　　要：测线布设是海洋重力测量中海区技术设计的主要内容,在保证测图精度和提高测量效率方面起着关键作用。目前测线间距依据测量任务而定,没有充分顾及测区重力异常的变化特性。结合海洋重力测量的特点,利用EGM2008模型重力异常作为测线布设的先验信息,在满足测量成果精度要求的前提下,估算测线布设间距。利用实测数据检验估算的测线布设间距的合理性,结果表明,利用EGM2008模型估算的测线间距布设测线能满足海洋重力测量的精度要求,为确定海洋重力测量测线布设间距提供量化依据。The survey line layout is the primary content of the technique design in marine gravity survey,which has decisive effect on assurance of the survey precision and efficiency.Survey line layout involves two aspects：One is the choice of line direction;the other is the determination of line spacing.The line direction should be as perpendicular as possible to the direction of the gravity anomaly contour;the line spacing should be widened as much as possible to meet the requirements of the accuracy of the results,in order to reduce the workload and improve the measurement efficiency.Given no sufficient consideration to the characteristics of the gravity anomaly,the line spacing is decided by survey assignment at present.The precision of EGM2008 model gravity anomaly is high in marine area;it can be used as priori information for the layout of marine gravity measurement lines.Based on the characteristics of marine gravity measurement,the EGM2008 model is used to estimate the spacing of marine gravimetric survey lines under the premise of meeting the accuracy requirements.The measured data is further used to verify the reasonableness of the survey line spacing layout.The results show that applying EGM2008 model to estimating the line layout spacing can meet accuracy requirements in marine gravity survey,which can provide the quantitative index for the optimizing of the survey line layout.

关 键 词：海洋重力测量 测线方向 测线间距 EGM2008模型 重力异常图 

分 类 号：P229.2[天文地球—大地测量学与测量工程]