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| Home > Publications database > Estimating near-infrared reflectance of vegetation from hyperspectral data |
| Journal Article | FZJ-2021-04476 |
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2021
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/30051 doi:10.1016/j.rse.2021.112723
Abstract: Disentangling the individual conttibutions from vegetation and soil in measured canopy reflectance is a grand challenge to the remote sensing and ecophysiology communities. Since Solar lnduced chlorophyll Fluorescence (SIF) is tmiquely emitted from vegetation, it can be used to evaluate how well reflectance-based vegetation indices (VIs) can separate the vegetation and soil components. Due to the residual soil background conttibutions, Near-infrared (NIR) reflectance of vegetation (NIRv) and Difference Vegetation index (DVI) present offsets when compared to SIF (i.e., the value of NIRv or DVI is non-zero when SIF is zero). In this study, we proposed a simple framework for estimating the true NIR reflectance ofvegetation from HyperspectraI measurements (NIRvH) with minimal soil impacts. NIRvH takes advantage of the spectral shape variations in ehe red-edge region to minimize the soil effects. We evaluated the capability of NIRvH, NIRv and DVI in isolating the true NIR reflectance of vegetation using the data from both the model-based simulations and Hyperspectral Plant imaging spectrometer (HyPlant) measurements. Benchmarked by simultaneously measured SIF, NIRvH has the smallest offset (0-0.037), as compared to an intermediate offset of 0.047-0.062 from NIRv, and the largest offset of 0.089-0.112 from DVI. The magnicude of the offset can vary with different soil reflectance spectra across spacio-temporal scales, which may lead to bias in the downstream NIRv-based photosynthesis estimates. NIRvH and SIF measurements from the sarne sensor platform avoided complications due to different geometry, footprint and time of observation across sensors when studying the radiative transfer of reflected photons and SIF. In addition, NIRvH was primarily determined by canopy structure rather than chlorophyll content and soil brightness. Our work showcases that NIRvH is promising for retrieving canopy structure parameters such as leaf area index and leaf inclination angle, and for estimating fluorescence yield with current and forthcoming hyperspectral satellite measmements.
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