Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 938-944.doi: 10.13278/j.cnki.jjuese.201603308

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Lithologic Information Extraction from ASTER Remote Sensing Data Based on Spectral Ratio Method

Chen Shengbo1, Yu Yafeng1, Yang Jinzhong2, Wang Nan1, Meng Hua1   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. China Aero Geophsical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
  • Received:2015-09-15 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by Geological Survey's Project(12120113100100)

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Abstract:

At present, the spectral bands ratio method can be used for extracting and recognizing the lithologic information.In this paper, the gabbro, peridotite, olive gabbro, and diorite in the north slope of north orogenic belt in Xinjiang are selected as the research object, we deeply analyze the difference of the four kinds of lithology in VNIR-SWIR spectrum domain. On account of the -OH absorption characteristic of the gabbro, olive gabbro, and peridotite diorite in the near 2 300 nm spectrum, we establish the relative absorption depth data of band 8, which is called RBD8.On the strength of the weak absorption characteristics of the olive gabbro, peridotite diorite and between 400 nm to 700 nm in the spectrum, we establish the RI21 ratio index to reflect the abundance of the four kinds of lithologies, which contain Fe3+. Because of the wide and strong absorption band of the four kinds of lithology near 1 100 nm in the spectrum caused by Fe2+, we establish the ratio index, which is called as RI54 to estimate the content of Fe2+.Using ratio indexes RBD8, RI21 and RI54 to enhance the image, respectively, we enhance image for the RGB color composite.We not only identify and extract the gabbro, peridotite, olive gabbro, and diorite, but also effectively distinguish the lithology information between schist and carbonate rock.Because of the wide and strong absorption band of the four kinds of lithology near 1 100 nm in the spectrum caused by Fe2+, we establish the ratio index which is called RI54 to estimate thecontent of Fe2+.

Key words: bands ratio, relative absorption-band depth, ASTER, lithology extraction

CLC Number: 

  • TP79

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