Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad

Geoid is vital information in the determination of orthometric height via GNSS levelling. Based on the ellipsoidal height observed by GNSS, the accurate orthometric height can be easily computed by adding precise and accurate geoid model information. This will particularly enable the users to replac...

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Bibliographic Details
Main Author:	Mohamad, Mohd Izwan Syazwan
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Geomorphology. Landforms. Terrain Surveying GPS receivers
Online Access:	http://ir.uitm.edu.my/id/eprint/21539/ http://ir.uitm.edu.my/id/eprint/21539/1/TD_MOHD%20IZWAN%20SYAZWAN%20MOHAMAD%20AP%20R%2018_5.pdf

id	uitm-21539
recordtype	eprints
spelling	uitm-215392018-10-02T00:31:26Z http://ir.uitm.edu.my/id/eprint/21539/ Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad Mohamad, Mohd Izwan Syazwan Geomorphology. Landforms. Terrain Surveying GPS receivers Geoid is vital information in the determination of orthometric height via GNSS levelling. Based on the ellipsoidal height observed by GNSS, the accurate orthometric height can be easily computed by adding precise and accurate geoid model information. This will particularly enable the users to replace the traditional orthometric height determination techniques to become faster and more cost effective. Currently, in Malaysia is consist two local geoid model that is MyGEOID04 are develop by DSMM using RCR method while PMSGM2014 are successfully establish by (sulaiman,2016) by using Least Square modification of Stokes’ approach also known KTH method. The both of the geoid model are has not been technically tested on the accuracy of the northern regions of Malaysia, especially in the state of Perlis. The main purpose of this study is to evaluate the local geoid model in absolute method and relative method by using static GPS observation data on selected BM / SBM. This evaluation is very important to determine the level of accuracy that the model geoid can provide for work that requires the determination of orthometric height using the GPS method. In the evaluation of the geoid model, it is found that the model of KTH Fitted are provide the accuracy of RMSE ±0.0651m by using absolute method whilst model from MyGEOID Gravimetric provides higher precision value close to MSL compared to other models with the value of RMSE ±0.0427m by relative method. The ability of both geoid models to provide geoid value to higher accuracy enables both models to adjust by geoid fitting process using parameters 3, 4 and 7 of the Similarity Transformation Model. As a result of the geoid fitting process, the geoid value has improved to close to MSL. Accuracy that has been generated by the new geoid model fitted and tested using data from MyRTKnet GPS observations prove that the model from KTH_4P and Mygeoid_4P give the accuracy of the RMSE ±0.0451 through absolute method. However, by using relative method model MyGEOID are given accuracy of the RMSE ±0.0479m compare to another geoid model. 2018-09-12 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/21539/1/TD_MOHD%20IZWAN%20SYAZWAN%20MOHAMAD%20AP%20R%2018_5.pdf Mohamad, Mohd Izwan Syazwan (2018) Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad. Degree thesis, Universiti Teknologi Mara Perlis.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Geomorphology. Landforms. Terrain Surveying GPS receivers
spellingShingle	Geomorphology. Landforms. Terrain Surveying GPS receivers Mohamad, Mohd Izwan Syazwan Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
description	Geoid is vital information in the determination of orthometric height via GNSS levelling. Based on the ellipsoidal height observed by GNSS, the accurate orthometric height can be easily computed by adding precise and accurate geoid model information. This will particularly enable the users to replace the traditional orthometric height determination techniques to become faster and more cost effective. Currently, in Malaysia is consist two local geoid model that is MyGEOID04 are develop by DSMM using RCR method while PMSGM2014 are successfully establish by (sulaiman,2016) by using Least Square modification of Stokes’ approach also known KTH method. The both of the geoid model are has not been technically tested on the accuracy of the northern regions of Malaysia, especially in the state of Perlis. The main purpose of this study is to evaluate the local geoid model in absolute method and relative method by using static GPS observation data on selected BM / SBM. This evaluation is very important to determine the level of accuracy that the model geoid can provide for work that requires the determination of orthometric height using the GPS method. In the evaluation of the geoid model, it is found that the model of KTH Fitted are provide the accuracy of RMSE ±0.0651m by using absolute method whilst model from MyGEOID Gravimetric provides higher precision value close to MSL compared to other models with the value of RMSE ±0.0427m by relative method. The ability of both geoid models to provide geoid value to higher accuracy enables both models to adjust by geoid fitting process using parameters 3, 4 and 7 of the Similarity Transformation Model. As a result of the geoid fitting process, the geoid value has improved to close to MSL. Accuracy that has been generated by the new geoid model fitted and tested using data from MyRTKnet GPS observations prove that the model from KTH_4P and Mygeoid_4P give the accuracy of the RMSE ±0.0451 through absolute method. However, by using relative method model MyGEOID are given accuracy of the RMSE ±0.0479m compare to another geoid model.
format	Thesis
author	Mohamad, Mohd Izwan Syazwan
author_facet	Mohamad, Mohd Izwan Syazwan
author_sort	Mohamad, Mohd Izwan Syazwan
title	Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
title_short	Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
title_full	Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
title_fullStr	Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
title_full_unstemmed	Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad
title_sort	evaluating and improving the accuracy of local [geoid] model in perlis region / mohd izwan syazwan mohamad
publishDate	2018
url	http://ir.uitm.edu.my/id/eprint/21539/ http://ir.uitm.edu.my/id/eprint/21539/1/TD_MOHD%20IZWAN%20SYAZWAN%20MOHAMAD%20AP%20R%2018_5.pdf
first_indexed	2023-09-18T23:06:47Z
last_indexed	2023-09-18T23:06:47Z
_version_	1777418535782318080

Evaluating and improving the accuracy of local [GEOID] model in Perlis region / Mohd Izwan Syazwan Mohamad

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