For precision agriculture, the mapping of crop variables with EO is an important source of information. The SLC (Soil Leaf Canopy) model simulates the reflectance of land surface by modeling the light passing through the canopy and the interaction with the soil underneath. By applying a model inversion the spatial distribution of the leaf area, chlorophyll content and leaf angles can be retrieved from optical satellite image. This requires a high quality atmospheric correction. For this the cirrus bands of Landsat 8 and Sentinel-2 offer new opportunities.