长江河道AutoCAD数据转换为GIS数据的方法  

Data conversion from AutoCAD to GIS for watercourse of Yangtze River

作　　者：安如[1] 张琴[1] 丁贤荣[1] 王船海[1] 

机构地区：[1]河海大学水文水资源学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2009年第5期523-528,共6页Journal of Hohai University(Natural Sciences)

摘　　要：在由CAD数据转入GIS数据库时属性信息的正确获取成为当前研究数据转换的重点.探讨了利用河道地形高程测点数据生成的不规则三角网为CAD中不连续等高线自动赋高程值的方法:首先基于最短距离和最小方向约束进行断线连接;然后利用三角网进行计曲线赋值;再利用计曲线与首曲线的相互位置关系对首曲线进行高程赋值;最后利用等高线上的特征点加密TIN网,并按高程值再次连接等高线.运用该方法实现了等高线高程值的自动赋值,为CAD等高线数据转入GIS系统提供了新的研究思路.试验及工程实践表明,该方法在少量人工质量控制的前提下,实现了高效率的CAD不连续等高线数据向GIS数据的自动转换.During the conversion from CAD data to GIS database, the obtaining of precise attributes of spatial data is a hot topic in the current researches on data conservation. The method of automatic assignment of elevation values to CAD discontinuous contours was discussed by use of the triangulated irregular network （TIN） generated based on the measured data at submarine elevation points. The method is described as follows： 1 ） the broken-line is connected based on the constraint of the minimum distance and angle;2） the assignment of elevation values to discontinuous submarine index contours are performed by use of the TIN;3） the elevation values of intermediate contours are determined by use of the relationship of positions between the index contours and the intermediate contours;4） the TIN is encrypted by means of the characteristic points of the contours, and the contours are again connected according to their correct values of elevation. The automatic value assignment of attributes to the elevation of contours was realized using the present method. A novel thought was given for the data conservation from CAD contours to GIS. The tests and engineering practice indicate that the present method is efficiently of automatic conversion from CAD discontinuous contour data to GIS data under the perquisite of a little manual control upon data quality.

关 键 词：AUTOCAD GIS 数据转换 等高线赋值 断线连接 不规则三角网 ARCENGINE 

分 类 号：P208[天文地球—地图制图学与地理信息工程]