为什么在北京54坐标系和西安80坐标系中所有点的y值要加上500km,为什么是500而不是其他的数值? 知乎 Template




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tomski为什么在北京54坐标系和西安80坐标系中所有点的y值要加上500km,为什么是500而不是其他的数值? 知乎 coloring