Landsat ETM+영상의 지표면온도와 NDVI공간을 이용한 광역 증발산량의 도면화
Regional Scale Evapotranspiration Mapping using Landsat 7 ETM+Land Surface Temperature and NDVI Space
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참고문헌
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초록
Evapotranspiration mapping using both meteorological ground-based measurements and satellite-derived information has been widely studied during the last few decades and various methods have been developed for this purpose. It is significant and necessary to estimate regional evapotranspiration(ET) distribution in the hydrology and water resource research. The study focused on analyzing the surface ET of Chungbuk using Landsat 7 ETM imagery. For this process, we estimated the regional daily evapotranspiration on May 8, 2000. The estimation of surface evapotranspiration is based on the relationship between Temperature Vegetation Dryness Index(TVDI) and Morton's actual ET. TVDI is the relational expression between Normalized Difference of Vegetation Index(NDVI) and Land Surface Temperature(LST). The distribution of NDVI corresponds well with that of land-use/land cover in Chungbuk. The LST of several part of city in Chungbuk is higher in comparison with the averaged LST. And TVDI corresponds too well with that of land cover/land use in Chungbuk. The low evapotranspiration availability is distinguished over the large city like Cheongju-si, Chungju-si and the difference of evapotranspiration availability on forest and paddy is high evapotranspiration.
Abstract
Evapotranspiration mapping using both meteorological ground-based measurements and satellite-derived information has been widely studied during the last few decades and various methods have been developed for this purpose. It is significant and necessary to estimate regional evapotranspiration(ET) distribution in the hydrology and water resource research. The study focused on analyzing the surface ET of Chungbuk using Landsat 7 ETM imagery. For this process, we estimated the regional daily evapotranspiration on May 8, 2000. The estimation of surface evapotranspiration is based on the relationship between Temperature Vegetation Dryness Index(TVDI) and Morton's actual ET. TVDI is the relational expression between Normalized Difference of Vegetation Index(NDVI) and Land Surface Temperature(LST). The distribution of NDVI corresponds well with that of land-use/land cover in Chungbuk. The LST of several part of city in Chungbuk is higher in comparison with the averaged LST. And TVDI corresponds too well with that of land cover/land use in Chungbuk. The low evapotranspiration availability is distinguished over the large city like Cheongju-si, Chungju-si and the difference of evapotranspiration availability on forest and paddy is high evapotranspiration.
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