Image Processing and Analysis of Mapping Alteration ZonesudIn environmental research, East of Kurdistan, Iran

摘要

Hydrothermal alteration zones have significant role in prospecting of epithermal mineral deposits.udIn this research, hydrothermal alteration zones in east of Kurdistan in Iran have been investigated usingudimage processing of remotely sensed data. The effectiveness of ETM+ data for detecting alteration zones hasudbeen assessed. Three band color composite images produced based on optimum Index Factor methodudand known spectral reflectance properties of rocks and alteration minerals in relation to ETM bands. The colorudcomposite of ETM bands, RGB (7,5,1), RGB (7,4,1) and RGB( b1-b2, b4-b2, b5-b7) achieved the most effectiveudmethod for separation of hydrothermal alteration ( high, medium and low) zones. The color composite of ETMudbands, 5, 3 and 1 displayed as RGB revealed the best band combination for identification of rock types thatudhydrothermal alteration affect in widespread region at East of Kurdistan.