跨投影带区域高程拟合方法分析

Analysis on Elevation Fitting Method in Cross-Projection Band Region

针对小投影带区域跨带拟合存在的问题,分析了多面函数法拟合和多项式曲面拟合在分带拟合和改变投影带后拟合方面的精度,并对利用大地坐标进行直接拟合的拟合精度进行分析。结果表明,统一投影带后的拟合效果优于分带拟合效果,多面函数拟合精度优于多项式曲面拟合精度;当拟合已知点跨越多个6°投影带时,利用大地坐标进行直接多面函数拟合,拟合精度相对较好。

To solve the problem of cross-projection band fitting in small projection region,we analyze the accuracy of polyhedral function fitting and polynomial surface fitting in the aspects of zoning fitting and fitting by changing projection band,and we also analyze the fitting accuracy of direct fitting by geodetic coordinates.The results show that the elevation fitting effect after unifying projection band is better than that of zoning fitting,and polyhedral function fitting is more accurate than polynomial surface fitting.When the fitting point spans several 6°projection zones,better fitting precision can be obtained by direct polyhedral function fitting using geodetic coordinates.