Ophiolite mapping using ASTER data:a case study of Derni ophiolite complex
基于ASTER数据的蛇绿岩组分识别：以德尔尼矿区为例

The ASTER(Advanced Spaceborne Thermal Emission and Reflectance Radiometer)reflectance data were evaluated in the mapping of main rocks and related altered mineral of the ophiolite complex in Derni area,Qinghai Province.The Spectral Angle Mapper was used for detection of the rock types and related minerals,taking the spectral curves from existing spectral library as the reference spectra.The mapping results were evaluated by the comparison with the geological maps.The results showed that the use of ASTER reflectance data and the spectra from the spectral library can effectively detect the main rocks and related minerals of the ophiolite complex.However,the different rocks have the different mapping accuracies,which is dependent on the spectral features that the rocks and minerals have.