To implement topographic map digitalization by means of MAPGIS is one of main means of getting spatial geographic information data, and that digitalization could bring out diversified sorts of errors.
利用MAPGIS实现地形图数字化是获取空间地理信息数据的主要手段之一，而图形数字化过程中会产生各种类型的误差。
The steps for the system establishment include digitizing the forest types map and topographic map and linking the attributes of forest types and spatial information.
该系统的建立包括林相图、地形图的数字化与处理，小班属性与空间信息系统相联结。
The topographic map contains a large amount of elevation information, and is an important source of DEM data.
地形图中包含了大量的高程信息，是DEM数据的重要的来源。
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