 The Sentinel-2 mission has the potential to provide accurate and reliable data for crop leaf area index, LAI, mapping. This can be achieved through the use of a lookup table, LUT, or Artificial Neural Network, ANN. Both methods have shown similar accuracy in retreating LAI, but the LUT method is more robust and less sensitive to changes in band selection. This article was authored by Guido D'Urso, Tobias B. Hank, Wolfer Mauser, and others.