Lineament Extraction from Open-Source Digital Elevation Models: a Comparative Analysis

Swathi Shetty, Pruthviraj Umesh, Amba Shetty
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Abstract

The extraction of lineaments from Digital Elevation Models plays an important role in inhospitable and inaccessible mountain forest areas. In this study, the lineaments extracted from different data acquisition techniques; stereo pairs (ALOS (30m), ASTER (30m), CARTOSAT (30m)), and InSAR (SRTM (30m, 90m), TanDEM-X (90m)) are compared. There is a quantifiable difference in the extracted lineaments from 30m and 90m resolution DEMs due to the different data acquisition methods and processing algorithms used. CARTOSAT provides a more number of lineaments than other DEMs. The length of the lineaments extracted is inversely proportional to the vertical accuracy of the DEM over the region. All the DEMs have a consistency in the orientation of the lineament extracted. The DEMs generated from stereo-images have shown higher lineament density than the DEMs acquired through the InSAR technique. This study shows the difference in the lineament extracted from the same resolution DEMs acquired through various acquisition techniques and helps in the selection of suitable DEM for lineament extraction in the dense forest area.
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开源数字高程模型的轮廓提取:比较分析
基于数字高程模型的地形特征提取在人迹少、人迹少的山地林区具有重要意义。在本研究中,从不同的数据采集技术提取的轮廓;对ALOS(30米)、ASTER(30米)、CARTOSAT(30米)和InSAR (SRTM(30米、90米)、TanDEM-X(90米))进行比较。由于使用不同的数据采集方法和处理算法,从30m和90m分辨率的dem中提取的轮廓存在可量化的差异。与其他dem相比,CARTOSAT提供了更多的纹理。提取的线条长度与该区域上DEM的垂直精度成反比。所有的dem在提取的纹理方向上具有一致性。由立体图像生成的dem显示出比InSAR技术获得的dem更高的线条密度。本研究揭示了在不同采集技术获取的相同分辨率DEM中提取的地形特征存在差异,有助于在茂密森林地区选择适合的地形特征提取DEM。
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