Articles

Extraction of Alteration Information Based on Airborne Hyperspectral Image

  • YANG Yanjie;ZHAO Yingjun
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  • Key Laboratory of Remote Sensing Information and Image Analysis Technique; Beijing Research Institute of Uranium Geology, Beijing 100029, China

Received date: 2011-03-18

  Revised date: 2011-07-26

  Online published: 2011-08-18

Abstract

Based on CASI/SASI images' characteristics, the hyperspectral images processing procedure is established. The contents of each step and things, which should be paid attention to, are introduced. Before the extraction of alteration information, the data pre-processing should be well completed, the type of alterations in the study area should be determined, and the corresponding spectral database should be built. Some empirical approaches are made for those processing. Based on the experience, the various methods are described in detail and some algorithms are improved. Based on the spectrum characteristics of the rock containing ferrous iron-rich on the CASI images of Keping area, the ferrous iron-rich rock extraction algorithms are proposed. The field work has proved that the alteration information extracted is correct, and the extraction of ferrous iron-rich is a good guidance for uranium exploration. The rule determining the mineralization model in the study area is found through the alteration information extraction and spatial superposition analysis on mine points or mineral area. The special distribution of ferrous iron-rich rock has a strong correlation with the uranium abnormal. In the study area, the red sand rock is the passage for uranium, the dyke is the storage for uranium, and the ferrous iron-rich rock makes uranium settle around the dyke. Three new dykes of uranium abnormal are found in south part of Keping using the method.

Cite this article

YANG Yanjie;ZHAO Yingjun . Extraction of Alteration Information Based on Airborne Hyperspectral Image[J]. Science & Technology Review, 2011 , 29(23) : 57 -61 . DOI: 10.3981/j.issn.1000-7857.2011.23.007

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