Figure 1. Spectral curves showing the dry leaf spectrum for sugar maple (solid line) and the effects of three contaminants to remote sensing data, an added 10% leaf water content, 25% soil background, and absorptions due to a 50 meter layer of atmosphere (dashed line). Spectral curves are for 1a) reflectance, 1b) continuum removed and normalized band-depths for three absorption features, 1c) the 1st derivative of log (1/reflectan ce), and 1d) the 2nd derivative of log (1/reflectance).