Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES 2020 Mediterranean and Middle-East Geoscience and Remote Sensing Symposium (M2GARSS) M2GARSS : Mediterranean and Middle-East Geoscience and Remote Sensing Symposium 326-329 TUNISIE MEDITERRANEEN BASSIN LEBNA BASSIN VERSANT 2020 2020/11/9-11 Tunis IEEE fdi:010083682 ENG ISI:000604612500074 10.1109/M2GARSS47143.2020.9105153 https://www.documentation.ird.fr/hor/fdi:010083682 https://www.documentation.ird.fr/intranet/publi/2022-02/010083682.pdf Horizon (IRD) The sustainability of agricultural sector involves a wise water resources management and therefore an accurate spatiotemporal vegetation monitoring with relevant tools such as satellite-derived indices (VI). In this study we evaluate the performance of NDVI and NDWI indices to infer the annual crops' (mainly wheat and faba-bean) aboveground biomass(AGB)at a Mediterranean watershed. The temporal evolution of IV over the annual crops area shows the presence of low-density and low water content vegetation in early and late season. Areas with well-developed canopy and high plant water content are dominant in the mid-season. The observed AGB of wheat and faba-bean shows a good correlation with NDVI and NDWI values (R-2>0.71). The used vegetation indices represent a practical tool to determine the spatiotemporal variation of annual crops' AGB in Lebna watershed, however, a large dataset for validation is needed. 068 ; 098 ; 072 ; 126