新疆巴里坤ETM数据遥感地质填图的探索

GEOLOGICAL MAPPING USING LANDSAT ETM DATA: A CASE STUDY IN BALIKUN, XINJIANG

对新疆巴里坤县八墙子一带ETM数据进行主成分分析、彩色,空间变换及假彩色合成等图像处理,同时,依据野外踏勘、实测剖面等资料不断调整图像处理方法;以最大程度突出已知岩性单元间影像区别为目的,通过全色谱段融合方式将图像比例尺提高到1?5万;在ArcV iew等平台上进行综合分析、解译和填图,并经过实地查验进一步修改填图方法与结果,最后编辑形成地质图。

Using Landsat ETM data, the authors applied remote sensing to geological mapping. First, the image processing （using ER Mapper 6.2 platform） mainly based on the principal component analysis, RGB -HSI -RGB transformation and false - color composition was adjusted according to several geological sections in the working area in order that the major lithological units could be distinguished from each other on the image. Then ETM Pan as well as the 15 m resolution band was used for promoting some final images to 1 ： 50,000 scale through data fusion. Moreover, geological mapping was carried out by using ARCVIEW 3.0 a platform on the basis of the images and in the light of the cross section studies and all of the known facts. Certain lithological boundaries and faults were selected to be inspected in site and the image processing was adjusted again to the inspection result. In the end, the geological map was fulfilled through the final modification based on the further processed images, general analyses and editing on the ArcInfo 7.1.1 platform. Field examination shows that this geological mapping method using remote sensing is accurate and suitable to the areas characterized by limited vegetation and soils as well as tough topography.