Testing the performance of a novel spectral reflectance sensor, built with light emitting diodes (LEDs), to monitor ecosystem metabolism, structure and function

By Youngryel Ryu, Dennis D. Baldocchi, J. Verfaillie, Siyan Ma, M. Falk, Ilse Ruiz-Mercado, Ted Hehn, Oliver Sonnentag. 2010

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Tracking the structural and functional development of a perennial pepperweed (Lepidium latifolium L.) infestation using a multi-year archive of webcam imagery and eddy covariance measurements (2011, background): “The site was subjected to year-round grazing by beef cattle (∼100, i.e. 278 km−2), causing a discontinuous, open pepperweed canopy of varying height (maximum 1 m) and density over bare soil and small patches of short grass (Ryu et al., 2010b).”
Climate change, phenology, and phenological control of vegetation feedbacks to the climate system (2013, background): “Near-surface remote sensing data, including measurements of canopy reflectance and transmittance (Jenkins et al., 2007; Ryu et al., 2010; Garrity et al., 2010), as well as digital imagery from “PhenoCams” (Fig.”
Digital repeat photography for phenological research in forest ecosystems (2012, background): “, 2010), light-emitting diodes (Ryu et al., 2010), a spectroradiometer (http://www.”