Reflectance spectra of RAMI forest stands in Estonia: Simulations and measurements

Simulated reflectance spectra of three mature hemiboreal forests are compared to top-of-canopy reflectance factor from helicopter measurements in the spectral range of 400–1050 nm. Most of the input parameters of the forest reflectance model FRT used in the simulations have been measured in situ. The same data were used in the fourth phase of the Radiation Transfer Model Intercomparison (RAMI). The reasons of the discrepancies between simulated and measured spectra are analyzed.