台灣位於菲律賓海板塊與歐亞板塊的交界，兩個板塊的相互擠壓作用造成全區發生非均勻的地表變形，另一方面，台灣現行的大地基準TWD97[2010]是一個靜態的大地基準，控制點的坐標成果一經公告後便不會改變。因此，基本控制點間的相對精度會隨著時間而下降，進而造成TWD97[2010]失去其原有的精確度。與台灣同樣位處板塊交界之美國、紐西蘭及日本等國，長期亦受到板塊運動引起非均勻地表變形之影響，分別採用了在原有的靜態大地基準中加入區域地表變形模型的半動態基準概念，以維持大地基準的精確性。因此，本研究採用1110個台灣現有GPS觀測站之水平速度資料，應用克立金法將縱谷兩側分開內插，據此建立台灣半動態基準之水平速度模型，並對模型進行精度檢核及半動態基準作法分析。研究成果顯示，本研究建立之水平速度模型，其整體精度於東西方向為±2.4 mm/year，於南北方向為±1.8 mm/year，且相較於美國、紐西蘭速度模型之精度檢核成果，無論在東西或南北方向，相差皆未超過±1.0 mm/year。但是，速度模型之精度在空間上是不均勻的，其在北部及中部地區精度最高，西南部次之，在東部及山區精度最低。而以速度模型進行半動態基準作法，能夠達到維持控制點間相對精度之目的。

Taiwan is located at the plate boundary between the Eurasian plate and Philippine Sea plate. There is significant crustal deformation due to the collision between plates. However, current geodetic datum of Taiwan is a static geocentric datum, in which coordinates of control points are held fixed. Therefore, relative accuracy between control points decreases with time. The objective of this research is establishing a horizontal velocity model into the original static datum let it can be semi-dynamic datum. We use velocity field from 1110 Global Positioning System (GPS) stations and Kriging method to establish a horizontal velocity model. In the external validation of velocity model, the RMS residual were 2.4 mm/year for the east and 1.8 mm/year for the north components. The accuracy result is close to the accuracy of western contiguous United States (CONUNS) and New Zealand velocity model. However, the accuracy of velocity model is not consistent at different districts, it is highest in central and northern Taiwan, lower in southwestern Taiwan, and lowest in eastern Taiwan. Assuming no large deformation event (ex. earthquake), adopting the velocity model to implement semi-dynamic datum can effectively maintain relative accuracy between control points.

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