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http://dx.doi.org/10.7780/kjrs.2003.19.5.341

Extension Test of Midday Apparent Evapotranspiration toward Daily Value Using a Complete Remotely-Sensed Input  

Han, Kyung-Soo (CNRM/GMME/MATIS, Meteo-France)
Kim, Young-Seup (Department of Satellite Information Sciences, Pukyong National University)
Publication Information
Korean Journal of Remote Sensing / v.19, no.5, 2003 , pp. 341-349 More about this Journal
Abstract
The so-called B-method, a simplified surface energy budget, permits calculation of daily actual evapotranspiration (ET) using remotely sensed data, such as NOAA-AVHRR. Even if the use of satellite data allows estimation of the albedo and surface temperature, this model requires meteorological data measured at ground-level to obtain the other inputs. In addition, a difficulty may be occurred by the difference of temporal scales between the net radiation in daily scale and instantaneous measurement at midday of the surface and air temperatures because the data covered whole day are necessary to obtain accumulated daily net radiation. In order to solve these problems, this study attempted a modification of B-method through an extension of hourly ET value calculated using a complete instantaneous inputs. The estimation of the daily apparent ET from newly proposed system showed a root mean square error of 0.26 mm/day as compared the output obtained from the classical model. It is evident that this may offer more rapid estimation and reduced data volume.
Keywords
Evapotranspiration; AVHRR; B-method; Surface Temperature;
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