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NTIS 바로가기한국지리정보학회지 = Journal of the Korean Association of Geographic Information Studies, v.14 no.3, 2011년, pp.236 - 256
김경민 (국립산림과학원 산림자원정보과) , 이정빈 (국립산림과학원 산림자원정보과) , 김은숙 (국립산림과학원 산림자원정보과) , 박현주 (한국환경정책.평가연구원 환경전략연구본부) , 노영희 (서울대학교 지리학과) , 이승호 (국립산림과학원 산림자원정보과) , 박기호 (서울대학교 지리학과) , 신휴석 (서울대학교 국토문제 연구소)
Forest carbon stocks change due to land use change is an important data required by UNFCCC(United Nations framework convention on climate change). Spatially explicit estimation of forest carbon stocks based on IPCC GPG(intergovernmental panel on climate change good practice guidance) tier 3 gives hi...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
k-NN 기법이란 무엇인가? | k-NN 기법은 비모수 회귀 추정식의 하나로, 알려지지 않은 정보를 얻기 위하여 야외 조사 자료와 위성 영상과 같은 부가정보를 사용하는 통계적 기법이다(임종수 등, 2007; Haapanen et al., 2001). | |
산림탄소저장량 추정은 활용 기술에 따라 어떻게 구분되는가? | 산림탄소저장량 추정은 활용 기술에 따라 현지 측정, 원격 탐사, GIS 등의 3가지 접근법으로 구분할 수 있다. | |
원격 탐사 기반 접근법의 한계점은 무엇인가? | 원격 탐사 기반의 경우 데이터 취득 반복, 분광 밴드와 식생 파라미터와의 높은 상관 등과 같은 장점때문에 대면적 AGB 추정, 특히 접근 불능 지역에 대해 주요 자료원이 되고 있으며 일반적으로 회귀분석 및 k-NN 기법 등을 활용하여 산림바이오매스와 탄소저장량을 추정하고 있다. 그러나 대상 지역에서 개발된 회귀 모형 결과를 다른 지역에 확장해서 적용하는 것은 한계가 있다. 보조 자료를 활용한 GIS 기반의 방법은 현지 조사에 의한 바이오매스 추정치를 업스케일링할 수 있는 유용한 방법이지만 데이터 품질이 우수한 보조 자료를 확보하는데 어려움이 따르며 AGB와 보조 자료와의 간접적인 상관관계, AGB 축적에 대한 환경 조건의 광범위한 영향 등을 고려해야 하기 때문에 분석이 어려운 측면이 있다(Lu, 2006). |
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