Influencia de la geometría de adquisición en el NDVI

In this work, the influence of the acquisition geometry in the NDVI and its implications in LAI retrieval have been analysed. Multiangular airborne POLDER data over a agricultural test site located in Barrax (Albacete) have been used. In particular, the influence of the view zenith angle in both the NDVI have been studied under three different sun zenith angles, in the principal plane as well as in the orthogonal planes. The results show the high anisotropy of NDVI as a function of illumination/view angles, mainly in the principal plane and when considering sparse vegetation canopies. As a consequence, these uncertainties are affecting the retrieval of LAI.