Assessing image processing techniques for geological mapping: a case study in Eljufra, Libya
Assessing image processing techniques for geological mapping: a case study in Eljufra, Libya
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DOI：
10.1080/10106040802556199
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发表时间：
2009-05
影响因子：
3.8
通讯作者：
N. Saadi;Koichi Watanabe
中科院分区：
文献类型：
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作者：
N. Saadi;Koichi Watanabe
本研究试验了各种图像处理技术，以评估其在利比亚西北部埃尔朱弗拉地区进行地质测绘的效率。遥感数据包括从航天飞机雷达地形任务（SRTM）数据中提取的多光谱光学陆地卫星增强专题制图仪（ETM+）、合成孔径雷达（ERS-2 SAR）和数字高程模型（DEM），用于追踪不同岩性单元并提取研究区域的地质轮廓。研究区地处干旱环境，几乎没有任何植被。大多数岩性和结构单元可以根据其地形形态和光谱特性来区分。对 ETM+ 和 ERS-2 图像的融合进行了实验，以进一步识别岩性单元。采用阴影浮雕技术来增强地形透视图并提取地质轮廓。结果区分了不同的岩石单元并修改了地层边界并揭示了新的地质构造。在由新边界定义的新地质图中确定并绘制了九个岩石单元。主要的轮廓线趋向于 NNW-SSE 和 NNE-SSW 方向。对地貌的分析和解释提供了有关研究区构造演化的信息。
Various image processing techniques were experimented with in this study to evaluate their efficiency for geological mapping in the Eljufra area of northwest Libya. Remote sensing data including multi-spectral optical Landsat Enhanced Thematic Mapper (ETM+), Synthetic Aperture Radar (ERS-2 SAR) and Digital Elevation Models (DEMs) extracted from the Shuttle Radar Topography Mission (SRTM) data were used to trace different lithological units as well as extracting geological lineaments in the study area. The study area is located in an arid environment mostly devoid of any vegetation. Most lithological and structural units are distinguishable based on their topographic form and spectral properties. Fusion of ETM+ and ERS-2 images was experimented with to further identify lithological units. Shaded relief techniques were implemented to enhance terrain perspective views and to extract geological lineaments. The results discriminated different rock units and modified formation boundaries and revealed new geological lineaments. Nine rock units were identified and plotted in the new geological map defined by the new boundaries. The dominant lineaments tend to run in the NNW-SSE and NNE-SSW directions. Analysis and interpretation of the lineaments provided information about the tectonic evolution of the study area.