基于热红外遥感数据的西藏冈底斯东段岩性识别

Lithological Identification of Eastern of Gangdise in Tibet Using ASTER Thermal Infrared Data

ASTER数据包含有从太空测量来自地球表面的多光谱热红外辐射数据。通过对JHU光谱库中岩石矿物热红外光谱特征的分析,以及对ASTER影像TIR波段光谱特征进行分析,利用比值法和光谱角制图法SAM相结合进行石英、砂岩和硅酸盐岩类等造岩矿物识别并在西藏冈底斯东段泽当矿田应用,最后将遥感解译分析结果与该区已的地质资料进行比较。结果表明,ASTER影像TIR波段基本上能识别硅酸盐类造岩矿物,并且对于岩性识别具有很大的应用潜力。

The ASTER images include multispectral thermal infrared emissivity data from the earth＇s surface measured in space.This work has made analysis of thermal infrared spectral features of rocks using the JHU spectral database and spectral features on TIR bands of ASTER images to identify rock forming minerals such as quartz,sandstone and silicate in the Tsedang orefield,eastern Gandise,Tibet by combination of the ratio method and spectral angle mapping（SAM）.Then the interpretation of the remote sensing data is compared with the available geological data in this region.The result shows that the ASTER images of band TIR can be used to identify the rock forming minerals of silicate and have potential application for discriminating lithology.