Fig. 4.

Red and near IR reflectances calculated using the SAIL canopy reflectance model. Points labeled water, soil, moss, and lichen indicate the reflectance of canopy backgrounds used in the simulations. The colored lines from the background points indicate the change in reflectance with increasing total canopy LAI, i.e., the sum of standing dead and green leaves, and these lines are labeled indicating the fraction of green leaves in the canopies. The line colors correspond to the lines in Figs. 5 and 6. Black solid lines radiating from the origin are lines of constant NDVI with the NDVI values shown by each line.