Figure 9.

(a) The relationship (gray line) between FIREFLY radiance and standard deviation based on observations made with the integrating sphere and ASD (black x); (b) the relationship (gray line) between the signal to noise ratio (SNR) and radiance, based on observations made with the integrating sphere and ASD (black x); (c) relationship (gray line) between coefficient of variation and radiance based on sphere observations (black x); and (d) an example FIREFLY vegetation spectra (gray line) with an example SIF signal (green dashed line, not drawn to scale) and the ratio of SIF to the expected noise based on the radiance values from the example vegetation spectra (black line).