Information Extraction of Red Clay and Siliceous Limestone in Red Clay-type Gold Deposit in Southwestern Guizhou,China,Using Short-wave Infrared Reflectance Data of ASTER
In this paper, short-wave infrared (SWIR) reflectance standard data of Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) was utilized to extract information of red clay and siliceous limestone in Hongqipo gold fields, southwest of Guizhou, China. Based on the field-measured reflectance data of red clay and siliceous limestone in the mining areas, the coefficients of 5-D spectral indices were calculated. That is a kind of orthogonal transformation in the five SWIR spectral spaces of ASTER data, expressed as a linear combination of reflectance of the five SWIR bands. The two indices were used to substitute the V and S in the HSV color transform, with a useful image created for visual interpretation of red clay and siliceous limestone. Taking into account there are still large areas of irrelevant information in the image, such as vegetation and water body, we applied masks to the SWIR reflectance image, built with band ratio thresholds for vegetation and water body using the dark target corrected ASTER L1B data. From this processed SWIR image, the images of red clay index and siliceous limestone index were calculated and the HSV color transform was done, also a result image obtained. A comparative analysis on the two resultant imagines show that vegetation and water body in the image does have an influence on the ore-bearing information extraction.
Hongqipo gold field in Guizhou:red clay:spectral indices:HSV color transform:masks for vegetation and water body
Caihong Yu Xiaobo Wu Shouxun Yan Chunsheng Xiao
Hyperspectral Research Laboratory,Institute of Remote Sensing Applications,Chinese Academy of Sciences Beijing,China
国际会议
The 18th International Conference on Geoinformatics(第18届国际地理信息科学与技术大会 Geoinformatics 2010)
北京
英文
1092-1095
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）