臺北市地籍資料TWD67與TWD97坐標轉換之比較研究

臺北市目前正積極將地籍資料由TWD67坐標系統轉換為TWD97新國家坐標系統，目前已經完成全市的三、四等衛星控制點整體網形平差作業，但因TWD67所採用的基準與TWD97的基準不同，且TWD67坐標系統缺乏正確的橢球資訊，因此衍生了基準轉換的問題。本文利用臺北市政府公告之三、四等衛星控制點共同點的TM二度坐標資料，以最小二乘法平差原則，進行不同區域大小與不同坐標轉換模式之地籍資料坐標轉換比較研究。研究結果顯示，將臺北市分成四個實驗區進行測試，以六參數非線性坐標轉換為較佳的模式，在涵蓋範圍選取方面則大致以地政事務所轄區範圍為最適當的坐標轉換區域大小。實驗成果顯示方位角誤差可控制在10秒內，距離誤差可以控制在3公分內。 Nowadays, Taipei City cadastral date transformation from the TWD67 coordinates system to the TWD97 new national coordinates system is working, and has done the third and forth satellite control point with the whole net adjustment; but the datum of TWD67 and TWD97 is different, and lake of the ellipsoidal height of TWD67, so there are some problems accrue when they are transformation. In the two-dimensional transformation by using the Least-Squares Adjustment of the Transverse Mercator coordinates in Taipei City Government Board. The result of this research will choose four experiment areas to test; after the test Affine nonlinear coordinate transformation is the best mode, and the area of a Land Office is the best way. Finally, in this research is show an error of azimuth can be control in 10 second, and the error of distance can be control in 3 cm.

Nowadays, Taipei City cadastral date transformation from the TWD67 coordinates system to the TWD97 new national coordinates system is working, and has done the third and forth satellite control point with the whole net adjustment; but the datum of TWD67 and TWD97 is different, and lake of the ellipsoidal height of TWD67, so there are some problems accrue when they are transformation. In the two-dimensional transformation by using the Least-Squares Adjustment of the Transverse Mercator coordinates in Taipei City Government Board. The result of this research will choose four experiment areas to test; after the test Affine nonlinear coordinate transformation is the best mode, and the area of a Land Office is the best way. Finally, in this research is show an error of azimuth can be control in 10 second, and the error of distance can be control in 3 cm.