Global geopotential model (GGM) assessment for coastal erosion study using global navigation satellite systems (GNSS) levelling in Terengganu
GNSS levelling can be used to define the high accuracy geoid based on geodetic, gravimetric, and astrogeodetic approaches. In order accurately measure the gravity anomaly and geoid height in the research region, Terengganu, it is necessary to evaluate the suitable Global Geopotential Model (GGM) bec...
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | en |
| Published: |
2024
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/12174/1/P16970_d4335ec00ca05588e34e29aa15ff496a.pdf%207.pdf http://eprints.uthm.edu.my/12174/ https://doi.org/10.30880/mari.2024.05.01.024 |
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| Summary: | GNSS levelling can be used to define the high accuracy geoid based on geodetic, gravimetric, and astrogeodetic approaches. In order accurately measure the gravity anomaly and geoid height in the research region, Terengganu, it is necessary to evaluate the suitable Global Geopotential Model (GGM) because coastal erosion and flood disaster may cause changes in shoreline and beach profiles. The aim of this study is verify the global geopotential model (GGM) with Global Navigation Satellite System (GNSS) levelling data in order to verify the global model with ground truth data in Terengganu. Hence, the Global Geopotential Model (GGM) model are selected based on satellite-only and combined-model in year 2018 through 2022. Next, the root mean square error (RMSE) is computed for each comparison in order to access the accuracy of each model. The study's results using the RMSE calculation showed that ITSG-Grace2018s had the lowest RMSE value, 0.2190m. Hence, the findings found that ITSG-Grace2018s represents the best fit GGM model with ground truth data in Terengganu. Thus, the local geoid height can be determined accurately in Terengganu using the most precise GGM model |
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