1〓Department of Surveying and Mapping, Guangdong University of Technology,100 West-Waihuan Road, Guangzhou 510006, China
2〓School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
3〓Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University,
129 Luoyu Road, Wuhan 430079, China
Abstract This article examines data reduction methods for airborne gravimetry, including reducing raw gravity observations along survey lines to average height level, compensating system errors by two-step crossover adjustment and gridding gravity data using weighted average (WA), and Shepard surface fitting (SSF) methods. Data block EN01, released by NGS (National Geodetic Survey), is processed according to the scheme, outputting 5′×5′ grid gravity disturbances covering a region of 2°×3°, with geodetic height 6 200 m. Compared to reference values computed by EGM2008 at the same locations, the accuracies of the output data from WA and SSF are ±1.59 mGal and ±1.36 mGal.
