首先用计算机图象处理系统将材料截面图形数字化，并采用链码方法和精确边界寻迹方法确定图形边界。
The boundary of the area of interest is located by using chain code method and precise boundary tracking method with a computer vision system.
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。
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.
然后，对预处理后的图像运用此算法实现了地质等值线图的边缘探测，并得到矢量图形数据，从而解决了地质等值线图件数字化问题。
Then, by applying this algorithm to the picture after pretreatment, we realize its edge-detection and get vector graphical data. As a result, we solve digital problem of geological contour-map.
该系统构建了长江及其流域湖泊的数字化地图，存储了大量的长江中下游渔业资源数据及其相关信息，实现了矢量图形数据和属性数据的完美结合。
The system, which constructs a numeric map of the Yangtze River and the related lakes and stores a large amount of data on fishery resource, perfectly integrates the maps and attribute data.
该系统构建了长江及其流域湖泊的数字化地图，存储了大量的长江中下游渔业资源数据及其相关信息，实现了矢量图形数据和属性数据的完美结合。
The system, which constructs a numeric map of the Yangtze River and the related lakes and stores a large amount of data on fishery resource, perfectly integrates the maps and attribute data.
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