Automatic extraction of contour lines from scanned topographic map
Automatic extraction of contour lines from scanned topographic map
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DOI：
10.1109/igarss.2004.1370296
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发表时间：
2004-12
期刊：
影响因子：
--
通讯作者：
Du Jinyang;Zhang Yumei
中科院分区：
文献类型：
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作者：
Du Jinyang;Zhang Yumei
从扫描地形图中自动提取等高线是地理信息系统中具有挑战性的课题之一。现有的大多数方法严重依赖于像素尺度上的图像处理，而很少关注轮廓线固有的空间关系。本文提出了一种有效实现等高线自动提取的新方案。该方案以数学形态学为基础，试图获取等高线的空间关系，并利用这些关系对断开的等高线进行匹配和连接。等高线自动提取的整个过程包括：分色获取等高线图像、消除图像噪声、图像去噪、图像去噪、线跟踪、等高线膨胀获取空间关系、基于空间关系的断线匹配与连接、矢量数据压缩与输出。根据该方案设计了相应的软件，并在扫描地图上进行了实验，进一步证明了该方法的有效性。
The automatic extraction of contour lines from scanned topographic map is one of the challenging subjects in GIS. Most of the methods available rely heavily on image processing on pixel scale and pay little attention to spatial relationships, which are inherent characteristics of contour lines. This work brings forward a new scheme aiming at the effective realization of automatic extraction of contour lines. Based on mathematical morphology, this scheme tries to acquire spatial relationships of contour lines and make use of them for matching and connecting broken contour lines. The whole process of automatic extraction of contour lines includes the following aspects: acquisition of contour line image by color separation, erasion of image noise, image skeletonizing process, line tracking process, acquisition of spatial relationships by dilation of contour lines, matching and connecting broken contour lines based on spatial relationships, compression and output of vector data. Software was designed according to the scheme and experiments on scanned maps further proved the effectiveness of the method.