本文提出地形图纸等高线的矢量化，进而提出生成三维地形模型的工程问题，阐述了扫描、预处理、细化等步骤-terrain contour drawings of vectorization, leading to formation of three-dimensional terrain model works, expounded the scanning, pretreatment steps such as thinning

在VC中利用MAPX实现各种性质的图层的使用，其中不包括细化图层。-in VC Connection use of various layers of the nature of the use, which does not include the thinning layer.