Comparison between Band ratios & Crosta method forDistinguishing of Altered Zones, by Using of Aster SensorData (Case Study: Meydook Area

Abstract:
      Utilization of ASTER data for alteration zones mapping has revealed considerable results. The sensor images of Earth surface in fourteen spectral bands in visible, near infrared, short wave infrared and thermal infrared wavelength ranges. In this study, the first, second, third, fifth, seventh and ninth bands of ASTER sensor were used. As band nine shows absorption and band seven shows reflection over the altered areas, seven over nine band ratio well revealed phyllic and argillic alteration zones. In order to enhance the alteration zones in the images, principal component analysis and selection of a component using Crosta method could help in recognizing the altered zones.

General:
     Utilization of ASTER data for alteration zones mapping has revealed considerable results. The sensor images of Earth surface in fourteen spectral bands in visible, near infrared, short wave infrared and thermal infrared wavelength ranges. In this study, the first, second, third, fifth, seventh and ninth bands of ASTER sensor were used. As band nine shows absorption and band seven shows reflection over the altered areas, seven over nine band ratio well revealed phyllic and argillic alteration zones In order to enhance the alteration zones in the images, principal component analysis and selection of a component using Crosta method could help in recognizing the altered zones.