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随着现代科学技术的发展,遥感影像为区域风沙地貌形态的研究提供了可靠的资料。近年来,有地貌学者提出了沙丘地貌格局分析法,通过在遥感影像上绘制沙丘脊线,量测和计算得到沙丘地貌格局表征参数,分析沙丘概率分布和空间变化规律、影响因素及形成时间。本文选取腾格里沙漠典型横向沙丘区域为研究对象,发展基于MATLAB平台的遥感影像沙丘脊线提取方法,利用沙丘迎风坡与落沙坡在遥感影像中成像的灰度差异,对沙丘的沙脊线进行提取,继而获得沙丘脊线长度、沙丘间距、走向、缺陷密度等沙丘地貌格局表征参数。结果表明,该方法快捷、可靠,为沙丘脊线的绘制提供了一种新方法。
With the development of modern science and technology, remote sensing images provide reliable information for the study of regional wind sand morphology. In recent years, some geomorphologists have proposed the sand dune geomorphology analysis method. By mapping the dune ridge on the remote sensing images, the geomorphologic parameters of the sand dune have been measured and calculated, and the probability distribution, spatial variation law, influencing factors and formation time of sand dune have been analyzed. This paper selects the typical transverse sand dune area in Tengger Desert as the research object and develops the remote sensing image ridge extraction method based on the MATLAB platform. By using the grayscale difference of the image of the windward slope and the falling sand slope in remote sensing images, Then, the dune geomorphology characterization parameters such as the length of the dune ridge, the distance between the dunes, the direction of the sand dune and the density of the defects are obtained. The results show that the method is fast and reliable, and provides a new method for drawing the ridge of dune.