NDLI: Estimating Evapotranspiration Using Triangle Method with Topographic Correction from MODIS Data in Taihu Basin, China

Content Provider	IEEE Xplore Digital Library
Author	Zhao Xiaosong Liu Yuanbo Zhao Dongbo Peng Jian
Copyright Year	2010
Abstract	Many water resources and agricultural applications require the knowledge of evapotranspiration (ET) over a range of spatial and temporal scales. Satellite remote sensing provides an unprecedented spatial coverage of land surface and atmospheric data that are logistically and economically impossible to obtain through ground based observation networks. The surface temperature-normalized difference vegetation index (Ts-NDVI) triangle method based on remote sensing datasets was widely applied to estimate regional ET. However, little research focused on influence of topography on triangle method application in complex topographic areas. To retrieve more accurate ET, topographic correction should be employed in mountainous areas. In this study, we estimate ET by triangle method with topographic correction from MODIS datasets in Taihu Basin, China. The evaporative fraction (EF), defined as the ratio of ET and available radiant energy, was estimated by the triangle method with topographic correction. And then, spatially distributed net radiation (Rn) maps were retrieved as an estimate of available energy to get both the spatial and temporal distribution maps of ET for clear sky days. Our results indicate that topographic correction improve to determine quantitatively the dry and wet edges of Ts-NDVI triangle space in Taihu Basin, and the EF value in mountainous area become more reasonable than before correction. The Rn retrieved is in good agreement with ground-based measurements with a correlation of 0.80 on average. The ET estimated, was validated by evaporation pan measurements in Taihu Lake station, showed consistent pattern compare to measurements.
Starting Page	1
Ending Page	5
File Size	1744898
Page Count	5
File Format	PDF
ISBN	9781424437085
DOI	10.1109/WICOM.2010.5601040
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-23
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Satellites Land surface Estimation Surface topography Land surface temperature Remote sensing MODIS
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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