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在投影带边缘测图边长变形过大，以致精度较低。采用转换１．５°投影带的投影方法，减小了变形，满足了测量精度的要求。
Side projection in the projection with the edge deformation is too large, resulting in lower accuracy. The projection method using the conversion 1.5 ° projection zone reduces deformation and meets the requirements of measurement accuracy.