A new extraction method of loess shoulder-line based on Marr-Hildreth operator and terrain mask.
A new extraction method of loess shoulder-line based on Marr-Hildreth operator and terrain mask.
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基于Marr-Hildreth算子和地形掩模的黄土路肩线提取新方法
DOI：
10.1371/journal.pone.0123804
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Liu K
中科院分区：
文献类型：
--
作者：
Jiang S;Tang G;Liu K
黄土肩线是将复杂的黄土地貌划分为黄土河间地和黄土沟坡地的重要构造线。现有的路肩线提取算法主要是基于地形特征的局部极大值。这些算法对复杂黄土表面的噪声敏感，提取参数难以确定，使得提取结果往往不准确。提出了一种新的黄土路肩线提取方法，利用Marr-Hildreth边缘算子构造初始路肩线。在此基础上，基于坡度分级和形态学方法，提出了限制黄土肩线边界的地形掩模，避免了非沟谷区的干扰，并对原始黄土肩线进行了修正。以位于山西北方黄土高原的宜君县为例进行了研究。网格大小为5 m的数字高程模型用作原始数据。为了获得最佳的尺度参数，通过Marr-Hildreth算子和手动描绘来计算肩线之间的欧几里德距离偏移。实验结果表明，在高斯平滑中，当σ = 5时，该方法的提取精度最高。精度评价表明，该方法提取黄土肩线的平均精度为88.5%，适用于黄土丘陵沟壑区黄土肩线的提取。
Loess shoulder-lines are significant structural lines which divide the complicated loess landform into loess interfluves and gully-slope lands. Existing extraction algorithms for shoulder-lines mainly are based on local maximum of terrain features. These algorithms are sensitive to noise for complicated loess surface and the extraction parameters are difficult to be determined, making the extraction results usually inaccurate. This paper presents a new extraction approach for loess shoulder-lines, in which Marr-Hildreth edge operator is employed to construct initial shoulder-lines. Then the terrain mask for confining the boundary of shoulder-lines is proposed based on slope degree classification and morphology methods, avoiding interference from non-valley area and modify the initial loess shoulder-lines. A case study is conducted in Yijun located in the northern Shanxi Loess Plateau of China. The Digital Elevation Models with a grid size of 5 m is applied as original data. To obtain optimal scale parameters, the Euclidean Distance Offset Percentages between shoulder-lines is calculated by the Marr-Hildreth operator and the manual delineations. The experimental results show that the new method could achieve the highest extraction accuracy when σ = 5 in Gaussian smoothing. According to the accuracy assessment, the average extraction accuracy is about 88.5%, which indicates that the proposed method is applicable for the extraction of loess shoulder-lines in the loess hilly and gully areas.
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