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The composition of understory vegetation plays a central role in satellite-based estimation of biophysical properties of the tree layer in managed boreal forests. In this letter, we assess the contribution of understory vegetation to the reflectance of a managed boreal forest area throughout a growing season both at stand and landscape levels. We use a time series of SPOT and Hyperion, and MODIS satellite...
The understory layer or ‘forest floor’ typically has a significant role in forming the spectral signal of a sparse boreal forest. However, the lack of field measurements on understory spectra and their seasonality has restricted the development of remote sensing algorithms for phenological monitoring. This paper reviews recent efforts to establish hyperspectral databanks of forest understory vegetation...
We measured simultaneously the spectral albedo of ten Scots pine shoots, and the needles constituting the shoots, in Zurich, Switzerland. Next, we used the spectral information to calculate the photochemical reflectance index (PRI) which allows to retrieve photosynthetic productivity from imaging spectroscopy data. Using p-theory, we showed that PRI values can be scaled between needle and shoot levels...
Physically-based remote sensing methods have progressively become more attractive for monitoring the vertical and horizontal structure of vegetation. A relatively recent development in modeling the radiation field of a vegetation canopy is the spectral invariants theory. The theory states that the radiation budget of a vegetation canopy can be parameterized using only spectrally invariant parameters...
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