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http://dx.doi.org/10.7848/ksgpc.2014.32.5.527

Accuracy Analysis of Orthometric Heights Based on GNSS Static Surveying  

Shin, Gwang-Soo (Dept. of Geoinformatics, University of Seoul)
Han, Joong-Hee (Dept. of Geoinformatics, University of Seoul)
Kwon, Jay Hyoun (Dept. of Geoinformatics, University of Seoul)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.32, no.5, 2014 , pp. 527-537 More about this Journal
Abstract
In 2013, NGII(National Geographic Information Institute) has developed and provided the KNGeoid13(Korean National Geoid Model 2013) to support the fundamental computation of GNSS-derived orthometric height. In this study, the adjusted ellipsoidal height, the sum of geoidal height and height by the leveling, is applied to calculate the GNSS-derived orthometric height without the local bias, based on GNSS static surveying and KNGeoid13. The mean of errors in GNSS-derived orthometric heights could be verified with the leveling data, which was actually less than 0.5 cm with using the adjusted ellipsoidal heights, but 3 cm by calculating differences between ellipsoidal heights and geoidal heights. By analyze the accuracy of GNSS-derived orthometric height depending on the duration of observation, we could realized 95% of data shows less than 4 cm accuracy, when the GNSS survey conducting for 4 hours spread over two days, but while the case of GNSS survey conducting for 4 hours and 2 hours respectively, resulted in 95% of data less than 5cm level of accuracy. Also, if the ambiguity is fixed, less than 10cm of accuracy could be obtained at 95% of data for only 30 minutes GNSS survey over a day. Following the study, we expected that the height determination by GNSS and geoid models can be used in the public benchmark surveying.
Keywords
GNSS-Derived Orthometric Height; KNGeoid13; GNSS Static Surveying; Adjusted Ellipsoidal Height;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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