RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 952-956.doi: 10.11870/cjlyzyyhj201606011

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EVALUATION OF KARST ROCKY DESERTIFICATION BASED ON THERMAL INFRARED REMOTE SENSING IN PINGGUO COUNTRY, GUANGXI

LIU Fang1,2, HE Bao-yin1, ZHANG Liang1, KOU Jie-feng1,2, WEI Jin-li3   

  1. 1. Institute of Geodesy and Geophysics of Chinese Academy of Science, Wuhan 430077, China;
    2. University of the Chinese Academy of Sciences, Beijing 100049, China;
    3. Guangxi Geomatics Center, Nanning 530023, China
  • Received:2015-09-28 Revised:2015-12-01 Online:2016-06-20
  • Supported by:
    National Natural Science Foundation of China (Grant No. 51079137, 41471433);Project of Geography Census Guangxi Mapping Agency;Bureau of Wuhan Science and Technology Major Science and technology Project

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Abstract: Karst rocky desertification is a serious problem in Southwest China. For better monitoring and evaluation of rocky desertification present situation by remote sensing, a new method for classification of rocky desertification based on thermal infrared remote sensing has developed. Taken Pingguo County in Guangxi province as the study area, Landsat 8 thermal infrared images in 2014 was acquired in summer and winter, brightness temperature was extracted and the difference of brightness temperature was calculated. After analyzing the different levels of brightness temperature rocky desertification threshold, rocky desertification was conducted to grading in Pingguo country. The results of the proportion of the total karst area of Pingguo County in 2014 were as follows. Severe rocky desertification was 3.87%; moderate rocky desertification accounted for 9.19%; mild rocky desertification accounted for 22.26%; potential rocky desertification accounted for 57.46%; non-rocky desertification accounted for 7.22%. By determining the appropriate threshold of temperature difference between summer and winter, it could divide effectively the rocky desertification degree grade. Compared with other methods, the new method has the characteristics with clear physical meaning, simple and effective, objective results etc.

Key words: karst rocky desertification, infrared remote sensing, Landsat 8

CLC Number: 

  • X87
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