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Journal of Applied Remote Sensing

Simple method to determine the Priestley-Taylor parameter for evapotranspiration estimation using Albedo-VI triangular space from MODIS data
Author(s): Yunjun Yao; Qiming Qin; Abduwasit Ghulam; Shaomin Liu; Shaohua Zhao; Ziwei Xu; Heng Dong
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Paper Abstract

In this contribution, we present a simple method based on Albedo-VI (vegetation index) triangular space to determine the Priestley-Taylor parameter for estimating evaporative fraction (EF) and evapotranspiration (ET) in arid and semi-arid regions. We apply this method to MODIS and observation data acquired during the Heihe river basin field experiment from July 1 to September 30, 2008. Results show that the decreasing trend of the estimated EF from MODIS data is consistent with that of precipitation during the period of day 183 to 274, 2008. The bias of estimated daily ET deviating from the corresponding ground-measured ET is −8.66 W/m2 and the root-mean-square error is 21.55 W/m2, indicating the Albedo-VI triangular method has a potential in ET estimation as a simple satellite-based method independent of surface ancillary data.

Paper Details

Date Published: 1 January 2011
PDF: 17 pages
J. Appl. Rem. Sens. 5(1) 053505 doi: 10.1117/1.3557817
Published in: Journal of Applied Remote Sensing Volume 5, Issue 1
Show Author Affiliations
Yunjun Yao, Peking Univ. (China)
Qiming Qin, Peking Univ. (China)
Abduwasit Ghulam, Saint Louis Univ. (United States)
Shaomin Liu, Beijing Normal Univ. (China)
Shaohua Zhao, Peking Univ. (China)
Ziwei Xu, Beijing Normal Univ. (China)
Heng Dong, Peking Univ. (China)

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