Abstract
Evaluation of an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image of the east Gandise, Tibet in China indicates that several important mineralization altered classes can be mapped with good exposure by using ratio image and spectral-angle mapper methods. The resampled ASTER nine-band image data set VNIR+SWIR in 15m spatial resolution was calibrated by using in situ measurements of spectral reflectance. Subsequently, four ASTER ratio images were employed for Al-OH, Fe, Mg-OH, Fe2+, Fe3+ and CO3 alteration extractions. For comparison purpose, in situ surface reflectance data were used to map alteration minerals using spectral angle mapper method for phyllic, propylitic, silicic, argillic, and carbonatic. The result shows that the distribution of the alteration rocks from the spectral angle mapper agrees very well with the alteration zones extracted from the mineralogic ratio images for hydrothermally altered rocks zone associated with copper polymetallic mineralization using ASTER data. The result shows that ASTER data may provide independent parameters useful for regional geological surveys.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
