Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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A Comparative Analysis of land Cover Changes Among Different Source Regions of Dust Emission in East Asia: Gobi Desert and Manchuria

동아시아의 황사발원지들에 대한 토지피복 비교 연구: 고비사막과 만주

  • Pi, Kyoung-Jin (Dept. of Geoinformatic Engineering, Pukyong National University) ;
  • Han, Kyung-Soo (Dept. of Geoinformatic Engineering, Pukyong National University) ;
  • Park, Soo-Jae (Dept. of Geoinformatic Engineering, Pukyong National University)
  • 피경진 (부경대학교 위성정보과학과) ;
  • 한경수 (부경대학교 위성정보과학과) ;
  • 박수재 (부경대학교 위성정보과학과)
  • Published : 2009.04.28
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Abstract

This study attempts to analyze the difference among the variations of ecological distribution in Gobi desert and Manchuria through satellite based land cover classification. This was motivated by two well-known facts: 1) Gobi desert, which is an old source region, had been gradually expanded eastward; 2) Manchuria, which is located in east of Gobi desert, was observed as a new source region of yellow dust. An unsupervised classification called ISODATA clustering method was employed to detect the land cover change and to characterize the status of desertification and its expanding trends using NDVI (Normalized Difference Vegetation Index) derived from VEGETATION sensor onboard the SPOT satellite for 1999 and 2007. We analyzed NDVI annual variation pattern for every classes and divide into 5 level according to their vegetation's density level based on NDVI. As results, Gobi desert is showed positive variation: a decrease $78,066km^2$ in central Gobi desert and out skirts of Gobi desert (level-0) but Manchuria area is worse than previous time: an increase $25,744km^2$.

본 연구에서는 변화하고 있는 지표를 파악하기 위하여 기존황사발원지인 고비사막과 새로운 황사발원지로 주목받고 있는 만주에 대한 토지피복 비교 분석을 수행하였다. 이를 위해 1999년과 2007년의 SPOT VEGETATION(VGT) 센서로부터 취득된 Normalized Difference Vegetation Index (NDVI) 10-day 자료를 사용하였다. 효율적으로 식물의 변화를 탐지하기 위해 NDVI패턴을 분석하고, 식생의 밀도에 따라 level로 분류하여 식생상태를 비교하였다. 그 결과 모든 level을 통해 황사발원지들의 동진추세를 확인할 수 있었다. 또한 기존의 황사발원지였던 고비사막과 황토고원은 positive한 변화를 보인 반면 새로운 황사발원지인 내몽골 고원과 만주는 negative한 변화를 보임을 관찰하였다. 특히 만주는 다른 황사발원지들과 다르게 사막이나 나지의 특성을 가지고 있지는 않으나 지속적으로 negative하게 변화함을 SPOT VGT의 1999년에서 2007년까지 9년 동안의 자료를 분석하여 확인하였다.

Keywords

References

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