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根据云南拟建高速公路的起止点横坐标长度及地形起伏情况,选择任意分带投影及高程抵偿面来减小投影变形差,进行坐标分带,并将高山区独立分带,能够满足规范规定测区内投影长度变形值不大于2.5cm/km的精度要求。同时,当采用隧道来通过最高海拔区的设计方案时,本文认为可尝试减少坐标分带。
According to the abscissa length of the starting and ending points of the expressway to be built in Yunnan Province and the undulation of the topography, arbitrary zonal projection and elevation compensation surface are selected to reduce the projection distortion, coordinate zoning, and the zonal isolation in the high mountains to meet the requirements of the code Projection within the projection length deformation is not more than 2.5cm / km accuracy requirements. In the meantime, when using tunnels to pass the design of the highest altitude zone, this paper considers that it is possible to try to reduce the coordinate zoning.