制图数据多边形区域符号自动填充算法实现

DLG建库数据是基础测绘生产的主要成果之一,而且在不断的更新,由于很多部门需要DWG格式的制图数据,因此实现DLG建库数据到制图数据的自动转换十分必要。多边形(面)要素是DLG数据的重要组成部分,实现制图数据多边形区域符号自动填充是DLG建库数据到制图数据自动转换的关键部分,该文提出面状区域符号自动填充的方法,该方法考虑到了多种复杂图形的情况,同时解决了小面积区域保证一个符号的问题,实验证明,该方法能够实现DLG入库数据多边形要素到制图数据的自动转换。

Realization of Automatically Filling Algorithm of Polygon Region Symbols in Cartographic Data

The DLG warehouse data is one of the main basic surveying and mapping achievements, and the DLG warehouse data has been constantly updated. Because many departments require the mapping data with DWG data format, thus, it is very necessary to realize the automatic conversion from DLG warehouse datas to mapping datas. Polygon elements are important parts of DLG datas. Realizing autofilling of regional symbols of polygon is the key part of automatic conversion from DLG warehouse datas to mapping datas. In this paper, an autofilling method of polygon symbols has been put forward. This method takes many complex graphics into account and solves autofilling symbols of the small area polygon. It is proved this method can achieve the automatic conversion of polygon elements from DLG warehouse datas to mapping datas.