遥感影像定向光照增强及构造解译

多光谱假彩色合成遥感影像已经广泛应用于线性构造解译,受构造应力场制约,区域构造均具有显著的定向性,当卫星影像拍摄时光照方向与区域线性构造方向不能匹配时,构造特征常常不能很好显示,从而影响解译效果。文章提出一种利用数字高程模型模拟特定方向光照模型增强多光谱影像的新方法,用垂直于解译目标的最佳光照模型替代原光照模型以增强区域构造线性特征,同一地区对不同方向的构造解译采用了不同方向的光照模型,有效提高了线性构造信息的可解译程度。以四川盆地西侧的龙门山以南地区为例,进行了断裂构造的遥感解译,对该区地震研究和油气勘探工作具有参考意义。

Directional illumination enhancing of remote sensing images and the fault interpretation

Multispectral false color composite (FCC) images are widely used in interpretation of linear structures, which are directional because of the restriction of tectonic stress field. However, when the satellite image illumination cannot match the directions of linear structures, the structural features are less visible and their interpretations cannot be clearly recognized. Therefore, the paper brings out a new technique based on directional illumination simulating from digital elevation models (DEMs) to enhance multispectral images, which can enhance the structure lineaments by exchanging the traditional illumination model to the optimum illumination perpendicular to the targets, and allow the interpretation of the directional structure lineaments by using certain direction illumination. The paper interprets the fault-related lineaments by remote sensing image in southern segment of Longmen Mountains thrust belt, and the accurate identifi cation of faults is the key to understanding tectonic structure for future work in oil and gas exploration.