Local geoid computation and evaluation |
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| Institution: | 1. University of Twente, Faculty ITC, Department of Earth Observation Science, Hengelosestraat 99, 7514 AE Enschede, The Netherlands;2. Braunschweig University of Technology, Department of Architecture, Civil Engineering and Environmental Sciences, Institute of Geodesy and Photogrammetry, Bienroder Weg 81, 38106 Braunschweig, Germany;1. Department of Geology and Geophysics, Yale University, 210 Whitney Ave, New Haven, CT 06511, USA;2. Géosciences Montpellier, Université Montpellier II and CNRS UMR 5243, cc060 Place E. Bataillon, 34095 Montpellier Cedex 05, France;1. Guangdong Province Key Lab of Computational Science, School of Mathematics and Computational Science, Sun Yat-sen University, Guangzhou 510275, PR China;2. Department of Mathematics and Statistics, State University of New York, The University at Albany, Albany, NY 12222, USA;3. Department of Mathematics and Statistics, Old Dominion University, Norfolk, VA 23529, USA |
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| Abstract: | A local geoid solution for the northern part of Greece is presented based on a recent processing of newly available gravity data in the area 40.25 ≤ /o ≤ 41.00, 22.5 ≤λ ≤ 24.25. The derived gravimetric geoid heights are compared with geoid heights computed at recently measured GPS/ leveling benchmarks. A 4-parameter transformation model is applied to the differences between the two aforementioned geoid height sets, and a discussion is given on the current state of the leveling datum in the test area and the Greek territory. Regional and local transformation parameters are computed and some numerical tests are performed. A common adjustment of gravimetric geoid heights and corresponding GPS/leveling heights will be carried out in another study following an integrated procedure in order to study problems arising from the combination of different height data sets for geoid determination. Finally, some conclusions are drawn on the problems related to the optimization of a local geoid solution. |
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