Title: Determination of northeast Asia's highest peak (Mt. Jade) by direct levelling
Authors: Hwang, Cheinway
Hsiao, Yu-Shen
Lu, Chihchiang
Wu, Wan-Shun
Tseng, Yao-Hsien
National Chiao Tung University
Keywords: GPS;pseudolite;obstructed sky;positioning;precision
Issue Date: 1-Jan-2007
Abstract: This paper demonstrates the results and problems in determining the height of Mt. Jade by direct levelling. Mt Jade is the highest peak in northeast Asia. GPS levelling and trigonometricl levelling were also made to validate the result of direct levelling. For GPS levelling a new geoid model is constructed using Taiwan's latest gravity database and elevation model. The accuracy of the geoid model ranges from cm in coastal plains to dm in high mountains. Helmert deflections of the vertical derived from this geoid model improve the accuracy of trigonometric levelling. Gravity data at benchmarks were collected to compute orthometric corrections for the heights from direct levelling. The Poincare-Prey reduction and the modified Mader reduction of mean gravity yield orthometric corrections that differ by up to dm near Mt. Jade. The Helmert orthometric height of Mt. Jade determined in this work is 3951.798 m, with a 72-mm commission error. The problem of using a rigorous orthometric height is discussed.
URI: http://dx.doi.org/10.1179/003962607X164961
ISSN: 0039-6265
DOI: 10.1179/003962607X164961
Volume: 39
Issue: 303
Begin Page: 21
End Page: 33
Appears in Collections:Articles