GEOID MODELING USING THE REMOVE-COMPUTE-RESTORE METHOD WITH TOPOGRAPHIC REDUCTION OF THE RESIDUAL TERRAIN MODEL
<p align="justify">The use of Global Navigation Satellite System (GNSS) technology is increasing to meet the spatial data needs related to information about positions with relatively high accuracies ranging from mm to cm, depending on the method used, the number of observed satellite...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/73388 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify">The use of Global Navigation Satellite System (GNSS) technology is increasing to meet the spatial data needs related to information about positions with relatively high accuracies ranging from mm to cm, depending on the method used, the number of observed satellites, their distribution, and satellite geometry. This technology can offer three-dimensional positioning around the world, but the height generated in GNSS is a height derived from an ellipsoid, namely a geodetic height that has no physical meaning. Along with the increasing use of GNSS technology in positioning and mapping, a geoid model is needed to transform the height information obtained from GNSS measurements into orthometric height information with a physical meaning. In this case, the geoid model used for practical purposes is the Earth Geopotential Model 2008 (EGM2008). However, the geoid model obtained from high-resolution EGM2008 has common errors due to datum inconsistency, density variability, and measurement accuracy. Therefore, there is a strong need to model the local geoid. In this study, local geoid modeling procedures were carried out using terrestrial gravity data, model EGM2008, and the Shuttle Radar Topography Mission (SRTM) in Central Java Island using the Remove-Compute-Restore method with reduced Residual Terrain Model (RTM). Geoid modeling in this study uses the Molodensky approach. The geoid model is validated by comparing the gravimetric geoid values resulting from geoid modeling from gravity data with geometric geoid values from GNSS/leveling measurements. The accuracy of the local geoid model generated from 1D-FFT and 2D-FFT with a resolution of 1' along the GNSS/leveling validation point is indicated by the RMSE of each model, which is 10.2 cm and 10.3 cm. In this study, it was found that the distribution and resolution of the data affect the quality of the resulting geoid model.
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