A NEW HEIGHT REFERENCE NETWORK IN TAIWAN
A NEW HEIGHT REFERENCE NETWORK IN TAIWAN
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DOI：
10.1179/sre.2003.37.290.260
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发表时间：
2003-10
期刊：
影响因子：
1.6
通讯作者：
Ming-San Yang;Kwo-Hwa Chen;Shyang Wen Shiao
中科院分区：
文献类型：
--
作者：
Ming-San Yang;Kwo-Hwa Chen;Shyang Wen Shiao
摘要台湾岛位于欧亚板块和菲律宾海板块交界处的活动构造带上。由于两个板块的碰撞会带来持续的造山过程，因此台湾必须定期重新测量岛台，以维持其垂直参考网的固有精度要求。现有的高程网是1979年通过SPIRIT水准技术建立的，理论表面重力量来自1967年大地参考系(GRS67)正常重力场。由于在建立时没有使用实际的重力测量，现有的网络在中部山区被发现存在严重的系统误差。本文介绍了一个新的台湾国家垂直基准--台湾垂直基准2001(TWVD2001)的设计与实现。新的基准面是在2200公里的一级水准线网络内，将在1010个新建立的基准上收集的大地水准测量和地表重力观测以最佳方式组合而成的。数据分析和平差计算是基于位势数进行的。计算了新垂直参考网的正高和正常高。
Abstract The island of Taiwan is located in an active tectonic zone on the boundary of the Eurasian and Philippine Sea plates. Due to the continuous mountain building process in association with the collision of the two plates, it is very important for Taiwan to periodically re-survey the island so as to maintain the intrinsic accuracy requirement of its vertical reference network. The existing height network was created in 1979 by means of the spirit levelling technique with theoretical surface gravity quantities derived from the Geodetic Reference System 1967 (GRS67) normal gravity field. Because of the lack of use of actual gravity measurements in its creation, the existing network has been found to suffer from severe systematic errors in the central mountainous areas. In this paper, we present the design and implementation of a new national vertical datum in Taiwan, Taiwan Vertical Datum 2001 (TWVD2001). The new datum was developed by optimally combining geodetic levelling and surface gravity observations collected at 1010 newly established benchmarks within a network of 2200-km first-order levelling lines. The data analyses and adjustment computation were based on geopotential numbers. Both orthometric and normal heights were computed for the new vertical reference network.