大地高误差对Bursa七参数平面转换精度的影响

Influence of geodetic height error on planimetric transformation precision of Bursa Seven-parameter

不同坐标系之间坐标转换,在实际应用中普遍使用Bursa七参数坐标转换模型进行转换。Bursa七参数是三维转换模型,需要重合点的大地高,而大地高通常无法精确获得,大地高误差势必影响转换结果。本文通过具体的试算,研究分析Bursa七参数坐标转换模型中重合点和转换点的大地高误差对转换参数以及转换后的平面结果的影响大小,得出了一些有益的结论。

For coordinate transformation between different coordinate system, Bursa Seven-parameter transformation is comman]y used. Seven-parameter transformation is three-dimension model and needs geodetic height of coincident points. Usually geodetic height can- not be precisely known, and the transformation result is bound to be influenced by geodetic height error. In this paper, the extent how much geodetic height error of coincident points and transformation points influenced transformation parameter and planimetric coordinate result in Seven-parameter transformation model was researched and analyzed by specific tentative, and some useful conclusion was obtained finally.