Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar

A Digital Elevation Model (DEM) is a 3-Dimensional representation of Earth ground surface without any object. The SRTM, ASTER and ALOS are the most well-known DEMs that have been made to general public free of charge and almost global coverage. The very recent release DEMs which is TanDEM-X with gre...

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Bibliographic Details
Main Author:	Abu Bakar, Asyraf Fahmi
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Geomorphology. Landforms. Terrain GPS receivers Radar
Online Access:	http://ir.uitm.edu.my/id/eprint/21548/ http://ir.uitm.edu.my/id/eprint/21548/1/TD_ASYRAF%20FAHMI%20ABU%20BAKAR%20AP%20R%2018_5.pdf

id	uitm-21548
recordtype	eprints
spelling	uitm-215482018-10-01T08:26:06Z http://ir.uitm.edu.my/id/eprint/21548/ Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar Abu Bakar, Asyraf Fahmi Geomorphology. Landforms. Terrain GPS receivers Radar A Digital Elevation Model (DEM) is a 3-Dimensional representation of Earth ground surface without any object. The SRTM, ASTER and ALOS are the most well-known DEMs that have been made to general public free of charge and almost global coverage. The very recent release DEMs which is TanDEM-X with great accuracy from German Aerospace Center (DLR), calls for opportunities for the conduct of the localized assessment of the DEM’s quality and accuracy to verify their suitability for a wide range of applications in the science studies. Since TanDEM-X vertical datum is referenced to ellipsoid height, this research responsible to investigate into the most suitable geoid model for our region is needed to determine a regional, seamless, and precise geoid model for orthometric height transformation of TanDEM-X. The Geoid Model is a type of spherical harmonic model developed from a complex mathematical modeling process of various sources of data includes satellite gradiometry, satellite altimetry, terrestrial gravity data and elevation data. The EGM96 and EGM2008 are global geoid model while PMGM2014 and MyGEOID are local geoid model has been tested in this research. Each Geoid Model has its own advantages, and the accuracy differs between regions. Therefore, the investigation into the most suitable geoid model for our region is needed to determine a regional, seamless, and precise geoid model for TanDEM-X. In this study, the evaluation of TanDEM-X, SRTM, ASTER and ALOS has been performed with the use of 1277 GPS point at land used area while to analyze the accuracy TanDEM-X was used the 5651 CRM points and IFSAR as a reference data. Meanwhile, the evaluation of the Geoid Model is carried out using 38 GPS/leveling benchmarks (BMs). Based on the statistical analysis, it is shown that highest accuracy of DEM with lowest Root Mean Square Error (RMSE) at agriculture is TanDEM-X 12m (RMSE=0.413m), coastal is TanDEM-X 12m (RMSE=0.655m), flat is TanDEM-X 30m (RMSE=2.107m), urban is SRTM (RMSE=2.216 m), hill is SRTM (RMSE=4.937m) and foothill is TanDEM-X 30m (RMSE= 5.581m). The analyze accuracy of TanDEM-X compared to CRM point was conducted using Confidence Interval (CI) with TanDEM-X 12m shows the better accuracy with RMSE for 68% CI is 0.712m, 95% CI is 1.262m and 99% CI is 1.336m. The accuracy of IFSAR against GPS data are 0.570m for agriculture, 2.411m for urban, 0.499m for flat and 0.841m for hill. The comparison between TanDEM-X and IFSAR shows TanDEM-X 12m performed well at agriculture (RMSE =0.696m) and urban (RMSE=2.314m) while TanDEM-X 30m lead the better accuracy at flat (RMSE=0.797m) and hill (RMSE=3.752m). The suitable Geoid Model for orthometric height transformation of TanDEM-X is MyGeoid because produced the good accuracies are 2.277m (TanDEM-X 12m) and 2.016m (TanDEM-X 30m). The results confirm the outstanding accuracy of the delivered product, which can be now utilized for both scientific and commercial applications 2018-09-13 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/21548/1/TD_ASYRAF%20FAHMI%20ABU%20BAKAR%20AP%20R%2018_5.pdf Abu Bakar, Asyraf Fahmi (2018) Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar. 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 GPS receivers Radar
spellingShingle	Geomorphology. Landforms. Terrain GPS receivers Radar Abu Bakar, Asyraf Fahmi Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
description	A Digital Elevation Model (DEM) is a 3-Dimensional representation of Earth ground surface without any object. The SRTM, ASTER and ALOS are the most well-known DEMs that have been made to general public free of charge and almost global coverage. The very recent release DEMs which is TanDEM-X with great accuracy from German Aerospace Center (DLR), calls for opportunities for the conduct of the localized assessment of the DEM’s quality and accuracy to verify their suitability for a wide range of applications in the science studies. Since TanDEM-X vertical datum is referenced to ellipsoid height, this research responsible to investigate into the most suitable geoid model for our region is needed to determine a regional, seamless, and precise geoid model for orthometric height transformation of TanDEM-X. The Geoid Model is a type of spherical harmonic model developed from a complex mathematical modeling process of various sources of data includes satellite gradiometry, satellite altimetry, terrestrial gravity data and elevation data. The EGM96 and EGM2008 are global geoid model while PMGM2014 and MyGEOID are local geoid model has been tested in this research. Each Geoid Model has its own advantages, and the accuracy differs between regions. Therefore, the investigation into the most suitable geoid model for our region is needed to determine a regional, seamless, and precise geoid model for TanDEM-X. In this study, the evaluation of TanDEM-X, SRTM, ASTER and ALOS has been performed with the use of 1277 GPS point at land used area while to analyze the accuracy TanDEM-X was used the 5651 CRM points and IFSAR as a reference data. Meanwhile, the evaluation of the Geoid Model is carried out using 38 GPS/leveling benchmarks (BMs). Based on the statistical analysis, it is shown that highest accuracy of DEM with lowest Root Mean Square Error (RMSE) at agriculture is TanDEM-X 12m (RMSE=0.413m), coastal is TanDEM-X 12m (RMSE=0.655m), flat is TanDEM-X 30m (RMSE=2.107m), urban is SRTM (RMSE=2.216 m), hill is SRTM (RMSE=4.937m) and foothill is TanDEM-X 30m (RMSE= 5.581m). The analyze accuracy of TanDEM-X compared to CRM point was conducted using Confidence Interval (CI) with TanDEM-X 12m shows the better accuracy with RMSE for 68% CI is 0.712m, 95% CI is 1.262m and 99% CI is 1.336m. The accuracy of IFSAR against GPS data are 0.570m for agriculture, 2.411m for urban, 0.499m for flat and 0.841m for hill. The comparison between TanDEM-X and IFSAR shows TanDEM-X 12m performed well at agriculture (RMSE =0.696m) and urban (RMSE=2.314m) while TanDEM-X 30m lead the better accuracy at flat (RMSE=0.797m) and hill (RMSE=3.752m). The suitable Geoid Model for orthometric height transformation of TanDEM-X is MyGeoid because produced the good accuracies are 2.277m (TanDEM-X 12m) and 2.016m (TanDEM-X 30m). The results confirm the outstanding accuracy of the delivered product, which can be now utilized for both scientific and commercial applications
format	Thesis
author	Abu Bakar, Asyraf Fahmi
author_facet	Abu Bakar, Asyraf Fahmi
author_sort	Abu Bakar, Asyraf Fahmi
title	Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
title_short	Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
title_full	Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
title_fullStr	Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
title_full_unstemmed	Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar
title_sort	evaluation the accuracy of tandem-x dem using global navigation satellite system [gnss] and [ifsar] / asyraf fahmi abu bakar
publishDate	2018
url	http://ir.uitm.edu.my/id/eprint/21548/ http://ir.uitm.edu.my/id/eprint/21548/1/TD_ASYRAF%20FAHMI%20ABU%20BAKAR%20AP%20R%2018_5.pdf
first_indexed	2023-09-18T23:06:48Z
last_indexed	2023-09-18T23:06:48Z
_version_	1777418537125543936

Evaluation the accuracy of tandem-X dem using global navigation satellite system [GNSS] and [IFSAR] / Asyraf Fahmi Abu Bakar

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