contour line extraction.
等高线提取
An Improved Method of Ridge Line Extraction
一种改进的脊线提取方法
The 3 rd is to change line extraction lift up.
第三条是转换取跷线。
Research on Contour Line Automatic Extraction from Scanned Topographic Map
扫描地形图等高线自动提取
A simplified method was put forward on a binary image contour line extraction.
该文对二值图像轮廓线的提取，提出了一种简捷的算法。
Study of automated extraction of shoulder line of valley from grid digital elevation data
基于栅格数字高程模型自动提取黄土地貌沟沿线技术研究
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