摘要
利用现有测绘的CAD地形图数据,对CAD数据处理方法进行研究,主要包括:单元管理、面状要素处理、属性加载和数据提取,通过左转算法进行构面处理;对所有面运用奇切偶不切原理进行切岛处理方法,实现了CAD数据自动提取成GIS数据。减少重复生产,提高工作效率,并应用于天津市1∶500、1∶2 000地形图数据自动提取GIS数据项目。
Current CAD topographic map,the study of CAD data processing method,mainly includes：unit management, planar elements processing ,properties loading and data extraction ,through left dimensions processing algorithm ;For all surface by using the princ, iple of the odd cut even inelevant to island cutting processing method,realizes CAD data automatically ex- tracted into GIS data. These can reduce duplication of production anti improve the efficiency. The method has been nsed in Ihe prqiect of GIS data automatic extraction from topographic map of Tianjin in CAD format at 1 ： 500,1 ： 2000 scales.
出处
《城市勘测》
2013年第5期23-25,共3页
Urban Geotechnical Investigation & Surveying
关键词
单元管理
框架线
辅助线
骨架线
basic management unit
wireframe
auxiliary line
skeleton line
