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4th Week of June 2019

Asner, Gregory P., and Peter M. Vitousek. Remote analysis of biological invasion and biogeochemical change. Proceedings of the National Academy of Sciences 102.12 (2005) 4383-4386
The exotic tree is invading the site. it has higher N concentration than native trees so that the spread of the invader can be easily detected by comparing chemical composition. Interestingly, some region was founded to have higher water content and lower N concentration than before. In that region, the other exotic tree are invading the understory. When remotely sensing, water content could estimated for both overstory and understory trees though N concentration could not.

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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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