Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Estimation of Net Primary Production for Nakdong River Basin using Vegetation Index

식생지수를 이용한 낙동강유역의 순일차생산량 산정

  • Shin, Shachul (Department of Civil Engineering, Andong National University) ;
  • Kwon, Giryang (Department of Civil Engineering, Andong National University)
  • Received : 2014.06.30
  • Accepted : 2014.08.12
  • Published : 2014.10.01
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Abstract

This study is to evaluate Net Primary Production (NPP) using NDVI calculated by MODIS in the Nakdong river basin. This study is based on the method of using the fact that NPP is proportional to natural vegetation condition. This method is different from existing one, using remote sensed data. It is known that NPP of natural vegetation is proportional to the absorbed amount of visible light that is proportional to NDVI. Therefore, estimating NPP by using NDVI is one of the most highly useful methods. This method can be used in a wide range of areas where vegetation data can not be obtained easily or where there is not enough meterological data. This study proposes the estimating method for NPP that is based upon NDVI, which is obtained by MODIS, and verifies by comparing the NPP with empirical results.

본 연구는 낙동강유역에 대하여 MODIS 자료로부터 정규화식생지수 NDVI를 계산하여 순일차생산량 NPP를 산정하는 것이다. NPP를 산정함에 있어 기존의 방법을 벗어나 객관적 자료에 의한 자연식생 조건과 NPP 사이에는 선형의 관계가 성립한다는 성질을 이용하고 있다. 자연식생의 NPP는 식물이 흡수하는 가시광선의 양에 비례하며, 또한 이것은 NDVI와 비례하는 것으로 알려져 있다. 따라서 NDVI를 이용한 NPP 산정방법은 대단히 유효하게 이용될 수 있는 하나의 방법이다. 본 연구에서 제안한 방법은 직접 자료획득이 불가능한 넓은 지역 및 기상자료가 충분하지 않은 지역에서 유용하게 사용될 수 있다. 본 연구에서는 MODIS 센서에 의해 얻어진 NDVI에 근거한 NPP 추정 방안을 제안하고 경험적인 방법에 의해 계산된 값과 비교함으로써 본 연구 성과에 대한 검증을 실시하였다.

Keywords

References

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