The purpose of 1: 250 000 topographic map updating is to maintain its currency in order to assort with the 1:50 000 topographic map. The paper discusses the problems in 1:250 000 topographic map updating and check - up.%1∶250 000数据库变量更新是为保持1∶250 000地形数据库的现势性,从而实现1∶250 000数据和1∶50 000数据的协调一致.本文结合笔者的生产实践经验,对在生产作业和检查过程中遇到的各种地形要素的综合取舍问题进行了整理.
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