为满足城市建设对于地形图现势性方面的需求，杭州市基础测绘管理实行了动态跟踪修测方法。
The Hangzhou basic mapping management department takes the dynamic following up on mapping method into action in order to adapt to the new situation.
通过地图自动缩编利用1：50 0地形图更新1：20 00地形图，减少城市基础地理信息系统的更新负担。
By using 1:500 topographic map updating 1:2000 topographic through generalization of automatic cartography, decrease the burden of UBGIS data revision.
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