Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Analysis of Land Cover Change Around Desert Areas of East Asia

식생 자료를 이용한 동아시아 사막 주변의 토지피복 변화 분석

  • Ryu, Jae-Hyun (Department of Spatial Information Engineering, Pukyong National University) ;
  • Han, Kyung-Soo (Department of Spatial Information Engineering, Pukyong National University) ;
  • Pi, Kyoung-Jin (Department of Spatial Information Engineering, Pukyong National University) ;
  • Lee, Min-Ji (Satellite Information Research Center, Korea Aerospace Research Institute)
  • 류재현 (부경대학교 공간정보시스템공학과) ;
  • 한경수 (부경대학교 공간정보시스템공학과) ;
  • 피경진 (부경대학교 공간정보시스템공학과) ;
  • 이민지 (한국항공우주연구원 위성정보연구센터)
  • Received : 2013.01.12
  • Accepted : 2013.02.09
  • Published : 2013.02.28
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Abstract

Desertification of the East Asia area induced by human's indiscriminate activities and natural causes has gradually expanded and demanded scientific research for monitoring and predicting land cover condition. Therefore, this research classified land types which were compared to MODIS land cover and analyzed the extent of barren zone effecting Korea through yellow dust using S10-DAY MVC NDVI from SPOT between 1999 and 2011. This study used unsupervised classification after processing NDVI Correction and Water Mask for eliminating noise values included in the data for enhancement of classification accuracy. The results of analysis are that there are active variations near the borders of desert, especially the Mongolian steppe and the Gobi Desert in central Asia. In addition, the extent of entire desert has been decreased in the middle of the last decade, although desertification is in going on in East Asia.

지구온난화와 인간의 무분별한 활동과 같은 인위적인 요인과 아열대고압대라는 자연적인 요인으로 인해 동아시아 지역의 사막화가 확산되고 있다. 사막화의 확산으로 인하여 우리나라에 영향을 주는 황사의 발원지가 변화하고 있다. 본 연구에서는 황폐한 지역의 토지 피복을 연구하기 위한 유용한 식생지수로 알려진 Normalized Difference Vegetation Index (NDVI)를 이용하여 동아시아 사막 주변의 토지 피복 변화를 관측하여 사막화의 시계열 변화와 패턴을 알아보고자 한다. SPOT위성의 VEGETATION 센서를 통해 동아시아 S10-DAY NDVI 데이터를 1999년부터 2011년까지 취득하였다. 데이터에 포함되어 있는 노이즈값을 제거하기 위해 NDVI Correction, WaterMask를 수행한 후 ISODATA 방법으로 무감독분류를 하였다. 무감독분류 된 클러스터에 대한 분석을 수행한 결과 사막 경계 부분에서 식생의 밀도가 활발하게 변화하고 있는 것을 확인하였으며 특히 고비 사막과 내몽골 고원 그리고 만주 지역을 중심으로 변화가 큰 것을 확인하였다. 2000년대 후반에 들어서 사막의 전체적인 크기는 감소하는 것으로 나타났지만 동쪽으로 사막화가 진행되는 것을 확인하였다.

Keywords

References

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