Horizon 1 1 5 OS CH : Chapitres d'ouvrages scientifiques IGARSS'95 : quantitative remote sensing for science and application : advance program IGARSS'95 : Quantitative Remote Sensing for Science and Application : Advance Program : Symposium 2227-2229 RELATION CLIMAT COUVERT VEGETAL INTERFACE VEGETATION ATMOSPHERE TRANSFERT DE CHALEUR FLUX THERMIQUE TEMPERATURE DE SURFACE ESTIMATION MODELISATION ETUDE EXPERIMENTALE ETUDE COMPARATIVE TELEDETECTION INFRAROUGE ZONE SAHELIENNE ZONE SEMIARIDE 1995 1995/07/10-14 Spring (USA) ; Bruxelles IEEE ; URSI fdi:010020951 ENG 10.1109/IGARSS.1995.524155 https://www.documentation.ird.fr/hor/fdi:010020951 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_53-54/010020951.pdf Horizon (IRD) To estimate sensible heat flux using thermal infra-red temperature T/sub r/ over sparse semi-arid vegetation, a knowledge of either the corrective term kB/sup -1/ or the difference between radiometric and aerodynamic surface temperatures T/sub r/-T/sub o/ is usually required. Several experimental data sets acquired over various sparse vegetation in semi-arid areas (fallow savannah and millet field of HAPEX-Sahel, grassland and shrubland of MONSOON' 90) are used to study the experimental behavior of these variables. When considering the extreme variability of kB/sup -1/ and the difficulty in predicting its value, the relationship between T/sub r/ and T/sub o/ was more thoroughly studied and parameterized using the conceptual two-layer model of Shuttleworth and Wallace (1985) 072BCLIGE ; 062MECEAU ; 126TELAPP08