WorldView-2高分辨率卫星数据在西昆仑塔什库尔干地区遥感地质调查中的应用

在西昆仑成矿带塔什库尔干地区,利用WorldView-2高分辨率卫星数据开展了遥感地质综合调查研究,采用最佳指数法选择适于本区遥感解译及信息提取的8-4-3波段组合,利用波段比值、主成分变换等方法增强岩性、构造和矿化信息并进行地质解译;结果表明,波段比值可识别闪长岩、大理岩、片岩等多套岩性并突出岩性之间的界线,主成分变换能增强黑云石英片岩与白色花岗岩体间界线,并能对不同片岩因矿物含量差异而呈现的不同色调、明暗程度有较好的反映。岩矿波谱测试及岩性反演和遥感矿化异常信息提取研究工作表明,大理岩等单矿物岩石波谱反演效果较好,对B1,B4,B8,B6等4个波段进行主成分变换及铁矿化信息的提取结果表明,PC3分量是铁染异常的特征主分量。利用WorldView-2数据在西部裸露地区进行矿产地质遥感综合调查,既有高地面分辨率的光学特征,又具有一定的波谱识别能力,不仅能提取大范围的矿化蚀变信息,还可以识别局部的矿体露头,应用效果较好,值得推广。

Application of WorldView-2 data to remote sensing geological survey in Tashkurgan area at west Kunlun

The latest WorldView-2 high resolution satellite images were applied to remote sensing geological survey in Tashkurgan area of west Kunlun.According to optimum index factor （OIF） is selected the band combination B8-B4-B3which is suitable for geological interpretation and information extraction in the area.The result shows that band ratio highlights lithologies of diorite,marble,schist etc.and their boundaries,principal component transform enhances boundary between quartz-biotite schist and white granite body and presents different tones and brightness of schists in which content of some minerals is varied.Spectrum measurement of rocks and minerals in test area,lithology inversion and extraction of remote sensing mineralization anomaly information indicate that spectrum inversion effect is better on monomineral lithologies,such as marble.Result of the principal component transform of bands B1,B4,B8,B6 and Fe mineralization information extraction shows that PC3 is the characteristic component of iron stain.WorldView-2 data are suitable to carry out geological and mineral remote sensing survey and advantageous in both high ground resolution of optical characteristics and a certain spectral recognition capability and are effective not only for information extraction from large area but also for recognition of local outcrop of mineralization thus valuable to popularized.