이전|다음

청장고원 대표 호수를 사례로 한 다중 위성 데이터 기반 호수 수체 색상 지수 일치성 보정 연구

  • role： First author第一作者
  • Affiliation：

    School of Mapping and Geoscience, Liaoning Technical University, Fuxin 123000, China

    Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

  • Email：13722881205@163.com
  • Introduction：谭章茹，研究方向为水色遥感、遥感影像处理。E-mail： 13722881205@163.com
TAN Zhangru12,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

    International Research Center of Big Data for Sustainable Development Goals, Beijing 100094, China

  • Email：wangsl@radi.ac.cn
  • Introduction：王胜蕾，研究方向为水色遥感、水环境时空变化及对全球变化响应。E-mail： wangsl@radi.ac.cn
WANG Shenglei23*,  
  • Affiliation：

    Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

    International Research Center of Big Data for Sustainable Development Goals, Beijing 100094, China

LI Junsheng23,  
  • Affiliation：

    Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

    International Research Center of Big Data for Sustainable Development Goals, Beijing 100094, China

ZHANG Fangfang23,  
  • Affiliation：

    Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

ZHANG Bing2

추상적인

호수 수체 색상은 수체 광학 특성을 직관적으로 반영하는 것으로 호수 생태계의 중요한 기후 변수입니다. 최근 몇 년간 위성 원격탐사를 기반으로 한 Forel-Ule 지수(FUI)는 대규모 호수 생태계 및 수질의 시공간 변화를 나타내는 데 널리 사용되고 있습니다. 다중 위성 센서의 협동 관측은 관측 빈도와 시공간적 범위를 크게 향상시킬 수 있으나, 역산 일치성 문제는 해결이 시급합니다. 본 연구는 청장고원 내 6개의 대표적인 호수를 연구 지역으로 하여 Landsat 5/TM, Landsat 7/ETM+, Landsat 8/OLI 및 MODIS 지표 반사율 제품을 기반으로 다중 위성 데이터의 호수 수체 색상 지수 FUI 역산의 일치성 보정 방법을 제안하였습니다. 이는 위성 스펙트럼 응답 함수 및 지표 반사율 제품의 시스템 편차로 인한 색도각과 FUI 역산 차이를 보정하기 위함입니다. 먼저, 수체 시뮬레이션 데이터셋의 다항식 보정 방법을 사용하여 각 위성 센서의 가시광선 대역에서 역산된 색도각에 대한 스펙트럼 응답 보정을 수행하였고, 다음으로 6개 호수에서 획득한 112,830쌍의 동기화된 지표 반사율 관측 데이터를 활용하여 MODIS와 Landsat TM, ETM+, OLI 간 색도각 역산값의 선형 회귀 모델을 구축하여 교차 보정을 진행하였습니다. 마지막으로 동기화 관측 데이터 및 장기 시계열 FUI 다중 소스 데이터 역산 결과를 바탕으로 보정 전후 다중 위성 데이터의 화소 단위 및 시계열 단위에서 일치성을 체계적으로 평가하였습니다. 결과는 보정 후 색도각 및 FUI 역산 결과의 일치성이 크게 향상되었음을 보여주었습니다(R²>0.95, MAPE<10%), 또한 4종 위성 데이터에서 역산된 호수 연평균 FUI 변화 추세가 일치하였습니다. 본 연구는 Landsat TM, ETM+, OLI 및 MODIS 다중 위성 데이터의 협동 역산을 통한 호수 수체 색상 파라미터 산출에 중요한 방법적 근거를 제공합니다.

키워드

수체 색상;다중 위성 원격탐사;스펙트럼 응답 함수;일치성 보정;색도각;Forel-Ule 지수(FUI);수체 반사율;청장고원 호수

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