[KongchangAI]
Unverified80% confidenceFactTime unknown

国家基本比例尺地形图体系中,1:50000是我国野外作业最常用基础图,等高距按地形分带(平原10米、山地20米),图幅按经纬度分幅编号,可据此系统拼接大范围区域

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