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Towards the selection of an optimal global geopotential model for the computation of the longwavelength contribution: A case study of Ghana
Joint Event on 3rd International Convention on Geosciences and Remote Sensing & Geochemistry, Environmental Chemistry and Atmospheric Chemistry
October 19-20, 2018 | Ottawa, Canada
Caleb Iddissah Yakubu
Hohai University, China
Posters & Accepted Abstracts: J Remote Sensing & GIS
Abstract:
The selection of a global geopotential model (GGM) for modeling the long-wavelength for geoid computation is imperative not only because of the plethora of GGMs available but more importantly because it influences the accuracy of a geoid model. In this study, we propose using the Gaussian averaging function for selecting an optimal GGM and degree and order (d/o) for the remove-compute-restore technique as a replacement for the direct comparison of terrestrial gravity anomalies and GGM anomalies, because ground data and GGM have different frequencies. Overall, EGM2008 performed better than all the tested GGMs and at an optimal d/o of 222. We verified the results by computing geoid models using Heck and Grüninger???s modification and validated them against GPS/trigonometric data. The results of the validation were consistent with those of the averaging process with EGM2008 giving the smallest standard deviation of 0.457m at d/o 222, resulting in an 8% improvement over the previous geoid model. In addition, this geoid model, the Ghanaian Gravimetric Geoid 2017 (GGG 2017) may be used to replace second-order class II leveling, with an expected error of 6.8mm/km for baselines ranging from 20 to 225km.
Biography :
Caleb Iddissah Yakubu has completed his MSc at the age of 27 years from Hohai University. He is currently working at GeoSmart Engineering Services Limited where he’s responsible for training recruits and project management. In addition to this, he is working on height system unification and using remote sensing techniques for environmental monitoring at Hohai University
E-mail: calebaid2000@gmail.com