Far-zone contributions of airborne gravity anomalies' upward/downward continuation  

作　　者：Boyang Zhou Zhicai Luo Yihao Wu Yuqiao Cen 

机构地区：[1]Department of Surveying and Mapping,Guangdong University of Technology [2]School of Geodesy and Geomatics,Wuhan University [3]Center for Urban Science and Progress,New York University

出　　处：《Geodesy and Geodynamics》2016年第6期444-450,共7页大地测量与地球动力学（英文版）

基　　金：supported by the National Natural Science Foundation of China (41504013,41174062);the Open Research Fund Program of the Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,China (14-01-03);the Doctoral Scientific Research Foundation of Guangdong University of Technology(253151010)

摘　　要：Airborne gravimetry has become a vital technique in local gravity field approximation, and upward/downward continuation of gravity data is a key process of airborne gravimetry. In these procedures, the integral domain is divided into two parts, namely the near-zone and the far-zone. The far-zone contributions are approximated by the truncation coefficients and a global geo-potential model, and their values are controlled by several issues. This paper investigates the effects of flight height, the size of near-zone cap, and Remove- Compute-Restore （RCR） technique upon far-zone contributions. Results show that at mountainous area the far-zone contributions can be ignored when EIGEN-6C of 360 degree is removed from the gravity data, together with a near-zone cap of 1°and a flight height less than 10 km, while at flat area EIGEN-6C of 180 degree is feasible.Airborne gravimetry has become a vital technique in local gravity field approximation, and upward/downward continuation of gravity data is a key process of airborne gravimetry. In these procedures, the integral domain is divided into two parts, namely the near-zone and the far-zone. The far-zone contributions are approximated by the truncation coefficients and a global geo-potential model, and their values are controlled by several issues. This paper investigates the effects of flight height, the size of near-zone cap, and Remove- Compute-Restore （RCR） technique upon far-zone contributions. Results show that at mountainous area the far-zone contributions can be ignored when EIGEN-6C of 360 degree is removed from the gravity data, together with a near-zone cap of 1°and a flight height less than 10 km, while at flat area EIGEN-6C of 180 degree is feasible.

关 键 词：Airborne gravimetryPoisson integralUpward/downward continuationFat-zone contdbutionsRemove -Compute -Restoretechnique 

分 类 号：P223.4[天文地球—大地测量学与测量工程]