引入改进Snake模型的黄土地形沟沿线连接算法  

A Shoulder-lines Connection Algorithm Using Improved Snake Model

作　　者：周毅[1,2] 汤国安[2] 习羽 田剑[2] 

机构地区：[1]陕西师范大学旅游与环境学院,西安市长安南路199号710062 [2]南京师范大学虚拟地理环境教育部重点实验室,南京市文苑路1号210046 [3]西安市水环境监测中心,西安市航天中路129号710199

出　　处：《武汉大学学报（信息科学版）》2013年第1期82-85,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金重点资助项目(40930531);国家自然科学基金资助项目(41201464;41171299);中央高校基本科研业务费专项资金资助项目(GK201102012);江苏高校优势学科建设工程资助项目

摘　　要：提出了一种利用坡面汇流改进的Snake模型实现黄土地貌沟沿线栅格点自动连接的新方法。该方法基于高分辨率DEM数据,利用正负地形边界处坡度转折特征,识别沟沿线点,进而用坡面汇流方向场改进了Snake模型中的梯度矢量流场,指引分水线缓冲曲线向沟沿线点蠕移,达到有序连接沟沿线点从而实现正、负地形的自动分割的目的。对比实验结果表明,该方法所识别的黄土沟沿线较好地逼近真实的地形特征。A novel method for automatic connection of Loess shoulder-lines using improved Snake model is designed in this paper.Firstly,according to the morphological characteristics of loess hillslope,raster points on the position of shoulder-lines are detected based on high resolution DEM data.Then buffer curve of divide line sets as the initial Snake curve.Thirdly,the gradient vector flow field,as core parameter in Snake model,is modified by hillslope flow direction field.Finely Snake curve is forced to creep to shoulder-line points under the guidance of the modified Snake model to make a continuous shoulder line,which is the division of P-N terrains.Segmentation experiments show the continuity and precision of results meet our need and have good agreement with the real topography.

关 键 词：沟沿线 正负地形 数字高程模型 主动轮廓模型 

分 类 号：P208[天文地球—地图制图学与地理信息工程]