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《Geomatics and Information Science of Wuhan University》 2013-01
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A Shoulder-lines Connection Algorithm Using Improved Snake Model

ZHOU Yi1,2 TANG Guoan2 XI Yu3 TIAN Jian2(1 Collage of Tourism and Environment,Shaanxi Normal University,199 South Chang'an Road,Xi'an 710062,China)(2 Key Laboratory of Virtual Geographic Environment,Nanjing Normal University,1 Wenyuan Road,Nanjing 210046,China)(3 Water Environment Monitoring Center,129 Hangtian Road,Xi'an 710199,China)  
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.
【Fund】: 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
【CateGory Index】: P931.6
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