Estimation of land surface evapotranspiration from remotely sensed data
Language English
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Author : Bi, Yuyun
Date : 25-01-2010

Research director(s) : Li, Zhao-Liang - Xu, Bin


Institution : Université de Strasbourg
Doctoral school : École doctorale Mathématiques, sciences de l'information et de l'ingénieur (Strasbourg ; 1997-....)
 
Discipline : Télédétection et imagerie physique
Classification : Earth sciences, Engineering

Keyword(s) : Pas de mots clés en anglais
Keyword(s) :
  • Évapotranspiration - Thèses et écrits académiques
  • Télédétection - Thèses et écrits académiques
Abstract : Evapotranspiration (ET) plays an important role in hydrology, meteorology, and agriculture. Accurate estimates of regional ET at different temporal and spatial scales are essential in these disciplines. Remote sensing technology is recognized as the only viable means to map regional- and meso-scale patterns of ET at the earth s surface in a globally consistent and economically feasible manner and surface temperature helps to establish the direct link between surface radiances and the components of surface energy balance. This thesis thus concerns the methodological development permitting to determine the regional land surface ET from the MODIS data onboard the polar satellites Terra and Aqua. The work of this thesis showed the advantage of the Ts-VI triangle method compared to the other methods traditionally employed for the determination of the regional ET and proposed methods to calculate land surface temperature and emissivity from the radiances measured by the satellites. This thesis showed also that it was possible to estimate ET in arid and semi-arid areas only from the satellite data with an acceptable precision. This work opens interesting prospects. In the restitution of regional ET, the exactitude of this restitution depends mainly on the exactitude of the dry and wet edges determination in the Ts-VI triangle and on the performance of the interpolation model involved in the evaluation of the evaporative fraction in the ET estimation model. The performances of the model and the new algorithm developed in this study have to be evaluated in the future in a precise and attentive way.
 
Content type : Text
 
Repository : Local resource
Identifier : ecrin-ori-299259
Document type : TEF