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Simulated reflectance spectra of three mature hemiboreal forests are compared to top-of-canopy reflectance from helicopter measurements in the spectral range 400-1050 nm. Most of input parameters of the forest reflectance model FRT used in simulations have been measured in situ. The same data sets were used in the Radiation Transfer Model Intercomparison (RAMI). The reasons of the discrepancies between...
A series of small, lightweight, autonomous spectrometer systems has been designed in Tartu Observatory. They are used for obtaining top-of-canopy spectral reflectance measurements for vegetation remote sensing, validation of radiative transfer models, and reflectance-based vicarious calibration of satellite and airborne sensors. The spectrometer systems are based on miniature spectrometer modules...
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