Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof

Geoid modelling is a process of developing mathematical algorithms to represent the geoid. This is the reference surface for orthometric height. Thus, the needs of geoid model in a certain region is a necessary. In order to compute a high resolution of gravimetric geoid model, the quality of the inp...

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Main Author:	Md Yusof, Nurul Nabilah
Format:	Thesis
Language:	English
Published:	2018
Subjects:	GA Mathematical geography Cartography
Online Access:	https://ir.uitm.edu.my/id/eprint/19134/2/TD_NURUL%20NABILAH%20MD%20YUSOF%20AP_R%2018_5.pdf
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id	my-uitm-ir.19134
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spelling	my-uitm-ir.191342022-10-25T08:30:45Z Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof 2018 Md Yusof, Nurul Nabilah GA Mathematical geography. Cartography Surveys. Sampling. Statistical survey methodology Geoid modelling is a process of developing mathematical algorithms to represent the geoid. This is the reference surface for orthometric height. Thus, the needs of geoid model in a certain region is a necessary. In order to compute a high resolution of gravimetric geoid model, the quality of the input data is the highest priority. One of the input data is the Digital Elevation Model (DEM), where it takes part in the correct determination of topographical influence. On behalf of that, this study want to test the effect of different DEM model used in the geoid model computation by using the Least Square Modification of Stokes’ with Additive Corrections. In this research, the local geoid model for Northern region is computed from several database which include 5784 terrestrial gravity and 129098 marine gravity data points from Department of Surveying and Mapping (DSMM), the 1 arc second ALOS and SRTM GDEM and the combined global Geopotential model GO_CONS_GCF_2_DIR_R3. These models has been undergo evaluation and validation with the local mean GNSS/levelling indicated that orthometric height derived from ALOS and SRTM and GGM model GO_CONS_GCF_2_DIR_R3 fit well with the local heights and geoid model with RMSE of 3.048m, 3.652m and 0.26676m, respectively. For the missing gravity data in the study area, the surface gravity anomalies extracted from World Gravity Map 2012 is used. The new gravimetric geoid model has been developed in the Northern region using 1’x1’ arc minute grid interval with limit of latitude N4.75° to N7° and longitude E99.25° to E101.25°. The optimum method provides the best result using evaluation for new gravimetric geoid compared to 38 GNSS/Levelling points. The value of RMSE for the new geoid model for both GDEM used are 26cm and 9cm using absolute and relative methods respectively. Comparison with local geoid model derived using RCR method shows that NGM17 gives better presentation of the local gravimetric geoid model in the northern region of Peninsular Malaysia 2018 Thesis https://ir.uitm.edu.my/id/eprint/19134/ https://ir.uitm.edu.my/id/eprint/19134/2/TD_NURUL%20NABILAH%20MD%20YUSOF%20AP_R%2018_5.pdf text en public dphil degree Universiti Teknologi MARA, Perlis Faculty of Architecture, Planning and Surveying Pa'suya, Muhamad Faiz
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Pa'suya, Muhamad Faiz
topic	GA Mathematical geography Cartography GA Mathematical geography Cartography
spellingShingle	GA Mathematical geography Cartography GA Mathematical geography Cartography Md Yusof, Nurul Nabilah Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
description	Geoid modelling is a process of developing mathematical algorithms to represent the geoid. This is the reference surface for orthometric height. Thus, the needs of geoid model in a certain region is a necessary. In order to compute a high resolution of gravimetric geoid model, the quality of the input data is the highest priority. One of the input data is the Digital Elevation Model (DEM), where it takes part in the correct determination of topographical influence. On behalf of that, this study want to test the effect of different DEM model used in the geoid model computation by using the Least Square Modification of Stokes’ with Additive Corrections. In this research, the local geoid model for Northern region is computed from several database which include 5784 terrestrial gravity and 129098 marine gravity data points from Department of Surveying and Mapping (DSMM), the 1 arc second ALOS and SRTM GDEM and the combined global Geopotential model GO_CONS_GCF_2_DIR_R3. These models has been undergo evaluation and validation with the local mean GNSS/levelling indicated that orthometric height derived from ALOS and SRTM and GGM model GO_CONS_GCF_2_DIR_R3 fit well with the local heights and geoid model with RMSE of 3.048m, 3.652m and 0.26676m, respectively. For the missing gravity data in the study area, the surface gravity anomalies extracted from World Gravity Map 2012 is used. The new gravimetric geoid model has been developed in the Northern region using 1’x1’ arc minute grid interval with limit of latitude N4.75° to N7° and longitude E99.25° to E101.25°. The optimum method provides the best result using evaluation for new gravimetric geoid compared to 38 GNSS/Levelling points. The value of RMSE for the new geoid model for both GDEM used are 26cm and 9cm using absolute and relative methods respectively. Comparison with local geoid model derived using RCR method shows that NGM17 gives better presentation of the local gravimetric geoid model in the northern region of Peninsular Malaysia
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Bachelor degree
author	Md Yusof, Nurul Nabilah
author_facet	Md Yusof, Nurul Nabilah
author_sort	Md Yusof, Nurul Nabilah
title	Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
title_short	Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
title_full	Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
title_fullStr	Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
title_full_unstemmed	Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof
title_sort	geoid determination over northern region of peninsular malaysia / using / kth method / nurul nabilah md yusof
granting_institution	Universiti Teknologi MARA, Perlis
granting_department	Faculty of Architecture, Planning and Surveying
publishDate	2018
url	https://ir.uitm.edu.my/id/eprint/19134/2/TD_NURUL%20NABILAH%20MD%20YUSOF%20AP_R%2018_5.pdf
_version_	1783733720684953600

Geoid determination over northern region of peninsular Malaysia / using / KTH method / Nurul Nabilah Md Yusof

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