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本文主要描述了一种基于彩色扫描地形图等高线的自动提取以及自动矢量化的方法,提出了通过空间插值解决等高线不连通问题的新方法。首先利用图像分割方法分色提取出栅格等高线,自动矢量化等高线(CLs1),然后对这些不连续的等高线赋值,结合其他地形要素(高程点、山脊线、山谷线等)创建DEM,从DEM中提取等高线(CLs2),最后利用提取出的等高线(CLs2)修正从地形图中自动矢量化得到的等高线(CLs1),得到连通的矢量化等高线。通过实验证明此方法是有效的,提高了等高线自动化程度。
This paper mainly describes a method of automatic extraction and automatic vectorization of contour lines based on color scan topography, and proposes a new method to solve the problem of contour line discontinuity through spatial interpolation. First of all, using the image segmentation method, the contour lines of raster are extracted, the vector contour lines (CLs1) are automatically vectorized, and then these discontinuous contour lines are assigned, combined with other topographic features (elevation points, ridge lines, valley lines, etc.) ) To create a DEM, extract the contour (CLs2) from the DEM, and finally use the extracted contour (CLs2) to correct the contour obtained from the automatic vectorization of the topographic map (CLs1) line. Experiments show that this method is effective and improves the degree of automation of contour lines.