IAG-IASPEI 2017

講演情報

Oral

IAG Symposia » G02. Static gravity field

[G02-2] Gravimetry

2017年7月31日(月) 10:30 〜 12:00 Room 502 (Kobe International Conference Center 5F, Room 502)

Chairs: Yoichi Fukuda (Kyoto University) , Leonid Vitushkin (D.I. Mendeleyev Institute for Metrology)

10:45 〜 11:00

[G02-2-02] A Comparison of Airborne Vector Gravimeter Measurements with the NOAA Geoid Slope Validation Survey 2014

Stephen Ferguson1, Yan Ming Wang2, Stefan Elieff1, Simon Holmes3, Xiaopeng Li4, Kevin Ahlgren2, Ruifeng Xi1 (1.Sander Geophysics Ltd., Ottawa, Canada, 2.The National Geodetic Survey, Silver Spring, MD USA, 3.SGT Inc. Greenbelt MD USA, 4.DST Inc. Silver Spring MD USA)

Gravity measurements made from aircraft are becoming widely used in combination with satellite and terrestrial data for geoid computation. At present, only measurements of the vertical component of the gravity vector are used for this purpose. Incorporation of the horizontal components of the vector offers the opportunity to strengthen the geoid solution, and minimize edge effects at the survey boundaries. Most airborne gravity meters do not offer the possibility of measuring all three components of gravity, however the AIRGrav system developed by Sander Geophysics has shown the ability to routinely obtain repeatability at the sub-milliGal level, with suitable processing.

This presentation will focus on a direct comparison of airborne measurements flown on a repeat track over the GSVS2014 test line located in Iowa, USA. The high-accuracy GSVS2014 ground data will be upward continued to the flight elevation for comparison with the measured airborne gravity components (equivalent to magnitude and deflection of the vertical). The airborne data will also be compared with the latest gravity models, including EGM2008, EIGEN6c4, and the current NOAA model xGEOID17. The vector airborne data will also be incorporated into a gravity model to assess their contribution.