High precision geoid for modernization of height systems in Indonesia

Download files
Access & Terms of Use
open access
Copyright: Kasenda, Adolfientje
Altmetric
Abstract
To establish a nationwide consistent height system for an archipelago country like Indonesia is exceptionally challenging. Yet, it needs to be resolved in order to provide infrastructure for mapping and the cadastre, planning and the development in natural resources or hydrocarbon exploration, monitoring sea level rise or flood control and other civil works. The height system generated from the precise levelling measurement has been inconsistent between islands datum. In this investigation, the height datum misfits between separated islands are assessed using various geoid models (i.e., EGM96, INDGED, GRACE and EGM08) and the results show different scales of distortions depending on which geoid model is used. The datum distortion between Sumatra and Jawa is 0.78m using INDGED, 0.80 m using the EGM96 and 0.48 m using the EGM08 geoids. Replacing the tedious terrestrial leveling observations by the more rapid technique which uses Global Navigation Satellite System (GNSS) will certainly accelerate the establishment of the height system and give a more consistent height datum. However, adopting the GNSS observation techniques to determine the modern height system requires a high precision gravimetric geoid model. This is the main problem that is addressed in this work. Various methods of geoid computation applied in the RINT and the GRAVSOFT program packages are tested for the gravimetric geoid solution. The comparison between the gravimetric and the geometric geoid using the Ring integration method computed with smaller capsize (0.2 degrees) shows similar results to those obtained using the FFT method applying Wong-Gore kernel modification up to degrees 360. Similar trends are also given by using the Collocation method. The result confirms that a high precision geoid model is achievable for the test area and with improved gravity data coverage as demonstrated in the error propagation study by simulating fill-in airborne data . The analysis shows that it should be possible to produce a geoid to better than 10 cm. A combination of the newly released EGM08 model, a high resolution DEM (e.g., 3 arc second SRTM) and the proposed airborne gravity measurements, (especially) in the coastal zone will provide the desired geoid. It is therefore, highly recommended that such measurements are implemented and (hopefully), that the high precision geoid for modernization of the Indonesian Height System can be realized in less than 5 years from now.
Persistent link to this record
Link to Publisher Version
Link to Open Access Version
Additional Link
Author(s)
Kasenda, Adolfientje
Supervisor(s)
Kearsley, Bill
Creator(s)
Editor(s)
Translator(s)
Curator(s)
Designer(s)
Arranger(s)
Composer(s)
Recordist(s)
Conference Proceedings Editor(s)
Other Contributor(s)
Corporate/Industry Contributor(s)
Publication Year
2009
Resource Type
Thesis
Degree Type
PhD Doctorate
UNSW Faculty
Files
download whole.pdf 3.48 MB Adobe Portable Document Format
Related dataset(s)