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1st Week of July 2019

Cho, Moses Azong, et al. Discriminating species using hyperspectral indices at leaf and canopy scales. The International Archives of the Spatial Information Sciences (2008) 369-376.
At canopy scale, PRI(Petrochemical Reflectance Index) was the best indicator for classifying plant species. It means, because PRI may influenced by soil background, PRI was well defined to detect leaf area and leaf angle information. REP(Red Edge Position), however, had no difference among both scales. It means that REP was well defined to detect leaf traits, so it was identical at canopy scale which probably had another information, such as lignin, leaf area, leaf angle, solar zenith, etc.

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4th week of june

Asner, G. P., Martin, R. E., Anderson, C. B., & Knapp, D. E. (2015). Quantifying forest canopy traits: Imaging spectroscopy versus field survey.  Remote Sensing of Environment ,  158 , 15-27. They use canopy sunlit reflectance at plot level and the trait samples from sunlit. The plot averaged refletance minimize canopy architectural effect. However actual field samples cover only 5% of a plot, the plot reflectance well explains canopy traits.
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AGU 2019

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2nd Week of August

Schaepman-Strub, Gabriela, et al. Reflectance quantities in optical remote sensing—Definitions and case studies. Remote sensing of environment 103.1 (2006) 27-42. If a surface was not an ideal specular or diffuse surface, one could observe diffuse light as well as specular light reflected off the surface. Reflectance is affected by where the incident light comes from and where the light is observed, which is represented by an angular distribution function. So different reflectance concepts are possible, so it is needed to use the term reflectance practically.
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