大地高对布尔莎坐标转换模型的转换精度影响研究

以某市控制测量项目的GPS点成果数据为例，基于布尔莎模型大地高误差对坐标转换精度的影响进行以常见的3种高程系统（以1985国家高程代替大地高；利用高程异常估算大地高；将大地高置0）进行坐标转换试验，认为“原坐标系使用正常高，目标坐标系使用大地高”进行坐标转换时既能达到较高的转换精度又较为符合实际工作情况。

Influence study on geodetic height on accuracy of coordinate transformation in Bursa Model of coordinate transformation

Using the GPS control point of a city as an example，coordinate transformation based on Bursa Model was used to analyze the influence of geodetic height，providing instruction of a practical work.The experiment was an implement of coordinate transformation using three height systems（national elevation system of 1985；the estimation of geodetic height using height anomaly；make geodetic height set to 0）.It was believed that when the original coordinate system was used with normal height and the target coordinate system was used with geodetic height，the coordinate transformation can not only achieve higher conversion accuracy but also conform to the actual working conditions.