基于连贯性的地形等高线提取方法研究  

Continuity-Based Contour Line Extraction Method

作　　者：李伟青[1] 彭群生[1] 

机构地区：[1]浙江大学CAD & CG国家重点实验室,杭州310027

出　　处：《计算机学报》2001年第9期938-943,共6页Chinese Journal of Computers

基　　金：国家创新研究群体科学基金 ( 6 0 0 2 12 0 1)资助

摘　　要：该文提出了基于地形等高线连贯性的等高线自动识别方法 .等高线连贯性包括点的连贯性和线的连贯性 .点的连贯性是指同一条等高线上的任何一点都具有相同的标高 ;线的连贯性是指相邻两条等高线的高度值之差是一个常量 .文中所提出的方法首先利用字符识别功能得到部分显式标注的等高线的高度值 ,然后利用等高线的连贯性建立等高线之间的邻接关系 ,并递推计算出其余等高线的高度值 .We propose a contour line extraction method based on the continuity between contour lines. According to the drawing rules, all the points on a contour line have the same altitude, and the difference between altitudes of two neighboring contour lines is constant. In our method, the altitude numbers of contour lines are picked up and recognized from a topographic image. Then the neighbor relationship of contour lines is established. From those contour lines whose altitudes have been recognized, the altitudes of other contour lines can be calculated based on the continuity. The results generated by the method on experimental drawings demonstrate the efficiency.

关 键 词：图纸识别 矢量转换 地形等高线 地形图 计算机 

分 类 号：P931[天文地球—自然地理学] TP391.41[自动化与计算机技术—计算机应用技术]