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首页> 外文期刊>Journal of surveying engineering >National Datum Uncertainty due to Reference Frame Transformation: Case Study for the Geodetic Datum of Taiwan
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National Datum Uncertainty due to Reference Frame Transformation: Case Study for the Geodetic Datum of Taiwan

机译：参考系转换带来的国家基准不确定性：以台湾大地测量基准为例

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摘要

With the advent of global navigation satellite systems (GNSSs), many national geodetic datums have been established with modern technology and referenced to a specific epoch of the international terrestrial reference frame (ITRF) definition. Following the static datum concept, the datum remains unchanged after its publication, which consequently creates problems in datum maintenance. In the recent update of TWD97, the national datum presently used in Taiwan, the resurvey coordinates are transformed back to the original frame but expressed in a recent epoch. In this study, the uncertainties resulting from the transformation between ITRF definitions in the region of Taiwan were investigated. Based on error propagation, a standard error of ±7 cm was estimated due to the transformation of the TWD97 coordinates between ITRF2005(2010.0) and ITRF94(2010.0). The uncertainties propagated from transformation parameters are more significant than those from station coordinates and velocities, and the uncertainty expands with the time interval. The SD is ± 1.1 cm for the transformation between ITRF2005 and ITRF2000. Considering that the uncertainty between later definitions is much smaller than transforming to ITRF94, it may be preferable to replace the ITRF94 with a modern ITRF definition, at least ITRF2000, for the next TWD97 datum maintenance.
机译：随着全球导航卫星系统（GNSS）的出现，已经利用现代技术建立了许多国家大地基准，并参考了国际地面参考框架（ITRF）定义的特定时代。遵循静态基准概念，基准在其发布后保持不变，因此在基准维护中产生了问题。在最近更新的TWD97（目前在台湾使用的国家基准）中，重新测量的坐标被转换回原始帧，但以最近的时期表示。在这项研究中，调查了台湾地区ITRF定义之间转换带来的不确定性。基于误差传播，由于ITRF2005（2010.0）和ITRF94（2010.0）之间TWD97坐标的转换，估计的标准误差为±7 cm。从变换参数传播的不确定性比从站坐标和速度传播的不确定性更重要，并且不确定性随时间间隔而扩大。在ITRF2005和ITRF2000之间转换时，SD为±1.1厘米。考虑到后面的定义之间的不确定性比转换为ITRF94的不确定性要小得多，对于下一个TWD97基准面维护，最好用现代ITRF定义（至少为ITRF2000）替换ITRF94。

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