CAJ | 학술논문

ASTER数据在短波红外和热红外波段光谱信息明显优于ETM,使得在ASTER波段范围内能够更为详尽地刻画地物波谱,尤其是具有特征谱带的岩石和矿物.选择内蒙古东乌珠穆沁旗北部地区为工作区域,设计了用光谱角制图法提取矿化蚀变信息的技术方案.通过波段组合和增强处理,ASTER数据对含Fe-OH(如黄钾铁矾,含铁白云母)、Al-OH(如粘土类矿物、明矾石、绿泥石、绢云母)和Fe~(3+) (如褐铁矿,赤铁矿)3种类型蚀变信息的刻画能力明显比ETM更好.野外查证了提取结果的可靠性.
ASTER수거재단파홍외화열홍외파단광보신식명현우우ETM,사득재ASTER파단범위내능구경위상진지각화지물파보,우기시구유특정보대적암석화광물.선택내몽고동오주목심기북부지구위공작구역,설계료용광보각제도법제취광화식변신식적기술방안.통과파단조합화증강처리,ASTER수거대함Fe-OH(여황갑철반,함철백운모)、Al-OH(여점토류광물、명반석、록니석、견운모)화Fe~(3+) (여갈철광,적철광)3충류형식변신식적각화능력명현비ETM경호.야외사증료제취결과적가고성.
The availability of spectral information in the shortwave infrared (SWIR) and thermal infrared (TIR) channels of the advanced spaceborne thermal emission and reflection radiometer (ASTER) is much better than that from Landsat ETM. It allows a detailed spectral characterization of land covers, particularly of those rocks and minerals with diagnostic spectra falling into the wavelength range of SWIR and TIR. The authors present a technical approach based on spectral angle mapper (SAM) for hydrothermal alternation information extraction from ASTER images. The method is applied to northern Dong Ujimqin in Inner Mongolia as a case study. The results shows that the ASTER images, through appropriate band combination and image enhancement, are preferable for retrieval of the follo-wing three kinds of hydrothermal alteration which contains Fe-OH (jarosite,iron dolomite),Al-OH (clay mineral, alunite, chlorite, sericite) and Fe~(3+) (limonite, hematite). Comparatively, ASTER images indicate a greater ability of depictin.