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政大典藏 > College of Social Science > Department of Land Economics > Periodical Articles > Item 140.119/110741

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/110741

Title:	Research into GNSS levelling using network RTK in Taiwan
Authors:	甯方璽 Li, Yi-Shan;Ning, Fang-Shii
Contributors:	地政系
Keywords:	Levelling;E-GNSS;Ellipsoidal height;Geoid undulation;Orthometric height
Date:	2017-06
Issue Date:	2017-07-07 16:44:20 (UTC+8)
Abstract:	Modern height surveying obtains orthometric heights through geoid undulations and ellipsoidal heights derived from global navigation satellite system (GNSS), a process referred to as ‘GNSS levelling’. In this study, an efficient survey technology, the e-global navigation satellite system (e-GNSS), was used instead of static satellite surveying to execute GNSS levelling. The e-GNSS in Taiwan is based on Virtual Reference Station-Real-Time Kinematic technology and networks. The orthometric heights were calculated by subtracting the geoid undulations, derived from three geoid models (gravimetric, hybrid, and geometric models), from the ellipsoidal heights, derived from the e-GNSS. Additionally, two corrector methods, namely the difference and the corrector surface method, were adopted to improve the accuracies and the systematic errors. The experiment showed that the two corrector methods improved the accuracies of the orthometric heights in the gravimetric model by approximately 66.3 and 80.0% and mitigated the systematic errors in the gravity model by approximately 96.2 and 99.9%.
Relation:	Survey Review, Vol.49, No.353
Data Type:	article
DOI link:	http://dx.doi.org/10.1080/00396265.2017.1340130
DOI:	10.1080/00396265.2017.1340130
Appears in Collections:	[Department of Land Economics] Periodical Articles

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