Application of the imaging spectroscopic technique in mineral identification and mapping

Abstract：The imaging spectroscopic identifying and mapping technique is one of the advanced new techniques that are now mainly developed in land and resource survey and monitoring. The main purpose of this study is to apply this technique in land and resource survey. For this purpose, the authors have studied some key technical problems arising in the utilization of the imaging spectroscopic technique for mineral identifying and mapping. The spectral features and variations of two important alteration minerals－muscovite and chlorite－are analyzed. Taking for example HyMap data from the Huangshan area, East Tianshan Mountains, Xinjiang, this paper introduces the application of some systematized imaging spectroscopic data processing techniques such as MNF trans－formation, pixel purity index (PPI) and n-dimensional visualized identification (NDVI) of endmembers in the identification and mapping of typical alteration minerals.