Integrating stations from the North America Gravity Database into a local GPS-based land gravity survey |
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| Institution: | 1. Center of Excellence for Geospatial Information Science (CEGIS), U.S. Geological Survey (USGS), 1400 Independence Road, Rolla, MO 65401-2602, United States;2. Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, IL 60115, United States;1. The Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Wybickiego 7, 31-261 Cracow, Poland;2. The Institute of Innovative Technologies EMAG, Leopolda 31, 40-189 Katowice, Poland;3. Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland;1. Space and Aviation Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia;2. Institute of Geodesy and Geoinformation (IGG), University of Bonn, Germany;3. National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt |
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| Abstract: | The ability to augment local gravity surveys with additional gravity stations from easily accessible national databases can greatly increase the areal coverage and spatial resolution of a survey. It is, however, necessary to integrate such data seamlessly with the local survey. One challenge to overcome in integrating data from national databases is that these data are typically of unknown quality. This study presents a procedure for the evaluation and seamless integration of gravity data of unknown quality from a national database with data from a local Global Positioning System (GPS)-based survey. The starting components include the latitude, longitude, elevation and observed gravity at each station location. Interpolated surfaces of the complete Bouguer anomaly are used as a means of quality control and comparison. The result is an integrated dataset of varying quality with many stations having GPS accuracy and other reliable stations of unknown origin, yielding a wider coverage and greater spatial resolution than either survey alone. |
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