The Leaf Area Index (LAI) is a vegetation biophysical variable used for various primary production models across scales and global models of climate, hydrology, biogeochemistry and ecology. This index is one of the parameters available on MOD15A2 products (MODIS satellite). However, some contradictories results have been reported bringing about uncertainties such as the overestimation of LAI values on herbaceous physiognomies and lower estimation on woody physiognomies. Thus, to test the accuracy of the LAI-MODIS product, were compared the LAI MODIS images with a LAI obtained by an empirical equation developed by Duchemin et al. (2006). To compare both methods, an algebraic equation was performed in two different areas: one municipality and one Cerrado conservation unit. The classification method chosen showed an important sensibility in differentiating both LAI methods spatially within the cerrado conservation unit.