A system is described for the interactive digitizing of polygons for such two-dimensional spatial modeling applications as growth studies and thematic map production. A digitizer connected online to a mini-computer with a refresh display is used for capturing polygon data from source documents. An area boundary network is developed by digitizing nodes, pointing to node pairs, and then digitizing edges only once. A CRT display monitors, and bell-rings confirm input operations. Facilities to erase nodes or edges are available. From the nodes and edges, software produces polygons which the user may name or discard. Slivering and overlap are eliminated because contiguous polygons have identical edge descriptions. Named polygons are then transferred to a large university time-sharing computer where spatial editing operations may be carried out, such as unioning pieces of a large map. The named polygons may he given additional non-spatial attributes and entered into a relational type of data base.
描述了一种用于多边形的交互式数字化的系统,该系统用于诸如生长研究和专题地图制作之类的二维空间建模应用。在线连接到带有刷新显示的小型计算机的数字化仪用于从源文档捕获多边形数据。通过将节点数字化,指向节点对,然后仅将边缘数字化一次来开发区域边界网络。 CRT显示监视器,并且铃声确认输入操作。提供擦除节点或边缘的功能。软件从节点和边缘生成多边形,用户可以命名或丢弃这些多边形。消除了重叠和重叠,因为连续的多边形具有相同的边缘描述。然后将已命名的多边形转移到大型大学分时计算机上,在该计算机上可以执行空间编辑操作,例如合并大地图的各个部分。命名的多边形可以赋予其他非空间属性,并输入到关系类型的数据库中。 P>
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