Fig. 7
End-member spectral plots for the HLS Headwall ‘HW’ hyperspectral system and an ‘ASD’ Field Spec 3 spectrometer (ASD Inc.; Boulder, CO) for foliage and groundcover (a) and bark (b). The HW provides hemispherical-conical reflectance factors from multiple sensor and sun geometries, whereas the ASD provides a fixed sensor-illumination source geometry providing biconical reflectance factors [62]. One standard deviation around the mean is shaded. The region around the HW O2A absorption band between 755 and 770 nm has been removed for aesthetics due to a misalignment of the two hyperspectral sensors less than one band (< 1 nm) in magnitude