VRS-RTK應用於圖根點測設成果分析－－以竹山鎮為例

Analysis of Traversing by Using VRS-RTK-A Case Study of Chu-Shan Township Area

內政部土地測量局自93年度起整合國內現有基準站，規劃建置全國性e-GPS衛星定位基準站即時動態定位系統，本研究係利用此系統西區服務網，以虛擬參考站（Virtual Reference Station, VRS）即時動態定位技術（Real-Time Kinematic, RTK）（簡稱VRS-RTK）檢核實驗區內控制點7點與圖根點35點，分析成果發現，縱坐標（N）較差絕對值之平均值小於2公分，橫坐標（E）較差絕對值之平均值約17公分，本研究試以竹山鎮實驗區內控制點7點為坐標轉換之共同點，透過四參數轉換（Helmert Transformation）與六參數轉換（Affine Transformation），其N、E坐標較差值均符合5公分內精度規範。 Since 2004, the Land Survey Bureau (LSB) of MOI, has been integrating the existing GPS base stations around the nation to build up a national e-GPS network. The study area is located within the west service net of the national e-GPS real time kinematic network. The 4 th and the higher order control points（7 points） and the traverse points（35 points） were examined with the VRS-RTK. Compared with the original data, the obtained results have shown that the average of the absolute value of errors is less than 2 cm at N-coordinate axis while larger than 17 cm at E-coordinate axis After Helmert and Affine transformations for test area either by 4-parameters or 6-parameters, the errors within 5 cm and accord with the demanding precision for traverse layout.

Since 2004, the Land Survey Bureau (LSB) of MOI, has been integrating the existing GPS base stations around the nation to build up a national e-GPS network. The study area is located within the west service net of the national e-GPS real time kinematic network. The 4 th and the higher order control points（7 points） and the traverse points（35 points） were examined with the VRS-RTK. Compared with the original data, the obtained results have shown that the average of the absolute value of errors is less than 2 cm at N-coordinate axis while larger than 17 cm at E-coordinate axis After Helmert and Affine transformations for test area either by 4-parameters or 6-parameters, the errors within 5 cm and accord with the demanding precision for traverse layout.