基于三次参数样条的等高线点加密算法  

Contour Points Automatic Encryption Algorithm Based on the Cubic Parameter Spline

作　　者：刘旭[1] 范磊磊[1] 王宝水 闫玉强[3] 

机构地区：[1]徐州市贾汪区国土资源局,江苏徐州221011 [2]江阴市城市规划信息咨询中心,江苏江阴214433 [3]苏州工业园区测绘地理信息有限公司,江苏苏州215027

出　　处：《地理空间信息》2015年第4期148-150,16,共3页Geospatial Information

摘　　要：分析了DXF格式结构中各组码段与对应代码段的含义及关系特点,实现DXF文件的读写,并根据提取地形图中等高线的信息,利用Visual C++编写三次参数样条自动实现对等高线进行点加密算法。通过实例验证,该算法可保证等高线原始趋势不变,特别是出现大挠度等高线时,对等高线进行点加密,能保证地形图的准确性,提高工作效率。This paper analyzed the structure of the code segment,the meaning and relationship characteristics of the corresponding code segment in DXF format.And then,the paper realized the DXF file reading and writing.According to the extraction of contour map information,based on Visual C^(++),the paper complied the cubic parameter spline algorithm to automatic encrypt the contour points.The results show that the algorithm can guarantee contour original trend changelessly,especially appear contour large deflection,the contour encrypt,guarantee the topographic map accuracy,and improve work efficiency.

关 键 词：VISUALC^++ 三次参数样条 等高线 点加密 

分 类 号：P208[天文地球—地图制图学与地理信息工程]