- 期刊
利用七參數進行TWD67、TWD97與e-GPS定位坐標之轉換－以中壢地區為例
Coordinate Transformation between TWD67, TWD97 and e-GPS by Using Seven Parameters Method: Case Study on Jhongli
摘要
內政部國土測繪中心業已完成全台e-GPS系統之建置，並已逐步推廣到地方政府的測量工作中；然e-GPS所量測之坐標，與台灣現行的TWD67及TWD97之間仍存有一系統性誤差，應可利用七參數坐標轉換法來修正。本研究在中壢觀音地區，選取了20點TWD67控制點與55點TWD97控制點來進行測試，並將量測成果與政府公告值相比較。經過七參數坐標轉換之後，e-GPS定位坐標與TWD67公告值之差異，在N方向上由203.84公尺降低為2.8公分，E方向上由829.93公尺降低為5.7公分。若比較e-GPS與TWD97之差異，在N方向上由4.1公分降低為1.6公分，E方向由2.7公分降低為1.6公分。證實了只要經過適當的坐標轉換，不論在單筆資料或平均值上，可將e-GPS應用於TWD97控制點地籍測量。
並列摘要
National Land Surveying and Mapping Center of Taiwan already constructed the e-GPS system, and this system is widely adopted by the cadastral survey. However, there is a systematic error existed between the TWD67, TWD97 and e-GPS, and this kind of error can be eliminated by using seven parameters transformation. In this study, 20 TWD67 and 55 TWD97 controlling points in Jhongli were measured by e-GPS and the measured coordinates were compared with the announced values by government. After coordinate transformation of seven parameters, the error between TWD67 and e-GPS was from 203.84m to 2.8cm in N direction; and that was from 829.93m to 5.7cm in E direction. Moreover, the error between TWD97 and e-GPS was from 4.1cm to 1.6cm in N direction; and that was from 2.7cm to 1.6cm in E direction. It will be okay to use e-GPS technology in TWD97 cadastral survey when proper coordinate transformation is employed.