高海拔地区高斯投影方法与实现

Lmplementation of gauss projection method in high altitude area

为解决高海拔地区高程对边长归算到参考椭球面上所引起的长度变形问题,采用理论分析的方法,研究高程对长度变形的影响规律.研究结果表明:当测区平均高程大于159.28 m时,必须考虑由高程所引起的长度变形;在保证椭球扁率不变的前提下,重新计算椭球参数,然后再进行高斯投影的计算,可以很好地解决高海拔地区的投影变形.为方便解决生产中所遇到的问题,利用Access VBA编写了相应的程序.该研究结论对高海拔地区控制测量解算具有一定的参考价值和指导意义.

In order to solve the length deformation problem caused by side length reduction to the reference ellipsoid in high altitude area, this study adopted the method of theoretical analysis and studied the influence rules of length deformation caused by elevation. The study result shows that the length deformation must be consider when the average elevation in the area is more than 159.28m, and recalculate ellipsoidal parameter first without changes of the flattening of ellipsoid, and then do the calculation applying Gauss projection. This is a better method to solve the length deformation in high altitude area. In order to facilitate the problem in the production, the corresponding calculating program using the Access VBA was developed. The conclusion of the study has a certain practical significance and reference value on data processing in high altitude area control survey.