Fig. 7. Unsupervised K means clustering method for low (red)-, medium (green)-, and high (blue)-yield classes calculated from the hyperspectral airborne image that obtained the highest correlation with yield (5 July 2001). It shows better performance for OSAVI than NDVI index, with poor segmentation performance when 60 absolute reflectance bands are used. Airborne image pixels shown are only those where yield data were collected with the yield monitor.