Relative Precision Analysis of Taiwan Geodetic Control Station between Different International Terrestrial Reference Frame

• Main Authors: Lu-An Chen, 陳律安
• Other Authors: Szu-Pyng Kao
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/27170502061245808888

碩士 === 國立中興大學 === 土木工程學系所 === 104 === Since 2012, TWD97 has been adopted as the Geodetic Datum in Taiwan. The epoch was set at 2010.0 and the ITRF94 was retained as the legal reference frame. The original survey was performed under ITRF2005. The results were converted to ITRF94 through secondary frame transformation and used as the current legal reference frame in Taiwan. For determining the influences that the secondary frame transformation of original survey results has on the relative precision of Taiwan geodetic control station, the present study adopted the following three analysis methods: (1) a difference analysis on the lengths of the baselines between datum stations after frame transformation; (2) an analysis of the standard deviation of the baselines between datum stations after frame transformation; and (3) an establishment and analysis of disposable frame transformation parameters. The findings indicated that following secondary frame transformation, the baseline length with the largest discrepancy between the original survey results was that between Matsu and Kenting (MZUM-KDNM baseline).The discrepancy of the baseline was only 0.06 cm. The root mean square error (RMSE) of the various baseline lengths was approximately 0.03 cm. The baseline length with the greatest deviation was the baseline between Taimali and the Port of Kaohsiung (TMAM-KASH baseline) at approximately 0.04 cm. Although the systematic error in the coordinate values was exhibited during the establishment of the disposable frame transformation parameters, specifically, a 3D deviant of 7.39 cm, the RMSE was only ±0.18 cm and the baseline length with the maximum deviation was only 0.02 cm. A data analysis of the research results revealed that the influence of different frame transformations on the relative position of the stations was minor. No problems with the drop in relative precision were observed between the new and old frame transformations. Further, the establishment and analysis of the disposable frame transformation parameters showed no significant influences on the relative positions of the various stations.