高斯投影平移参数对地形图坐标转换影响

Influence of Gaussian projection translation parameters on the topographic map coordinates transformation

文中主要实现地形图从北京54地方坐标或西安80地方坐标到CGCS2000坐标变换,并且推导了空间转换模型七参数求取方法,分析了高斯投影坐标平移参数误差对七参数的影响。理论证明,在地面上100 km×100 km范围内,即使高斯投影平移参数的精度在几十米,对坐标变换的影响仍能满足工程需求,并结合实际工程,给出了真实算例,进一步验证了结论。

Beijing 54 local coordinates or Xi＇an 80 local coordinates were changed to CGCS2000 coordinates mainly in the topographic map. Calculation method of seven parameters of the spatial transformation model was deduced and the influence of Gaussian projection coordinate translation parameters error on seven parameters was analyzed. It was theoretically proved that the influence of the coordinate transformation could meet the engineering requirement even if the accuracy of the Gaussian projection translation parameter was tens of meters within 100 km×100 km on the ground. And a practical example was given to prove the conclusion combining the actual engineering.