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Retrieval and validation of forest background reflectivity from daily Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) data across European forests

Jan Pisek 1 Angela Erb 2 Lauri Korhonen 3 Tobias Biermann 4 Arnaud Carrara 5 Edoardo Cremonese 6 Matthias Cuntz 7 Silvano Fares 8 Giacomo Gerosa 9 Thomas Grünwald 10 Niklas Hase 11 Michal Heliasz 4 Andreas Ibrom 12 Alexander Knohl 13 Johannes Kobler 14 Bart Kruijt 15 Holger Lange 16 Leena Leppänen 17 Jean-Marc Limousin 18 Francisco Serrano 19 Denis Loustau 20 Petr Lukeš Lars Lundin 21 Riccardo Marzuoli 22 Meelis Mölder 4 Leonardo Montagnani 23, 24 Johan Neirynck 25 Matthias Peichl 21 Corinna Rebmann 11 Eva Rubio 19 Margarida Santos-Reis 26 Crystal Schaaf 2 Marius Schmidt 27 Guillaume Simioni 28 Kamel Soudani 29 Caroline Vincke 30
Abstract : Information about forest background reflectance is needed for accurate biophysical parameter retrieval from forest canopies (overstory) with remote sensing. Separating under- and overstory signals would enable more accurate modeling of forest carbon and energy fluxes. We retrieved values of the normalized difference vegetation index (NDVI) of the forest understory with the multi-angular Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF)/albedo data (gridded 500 m daily Collection 6 product), using a method originally developed for boreal forests. The forest floor background reflectance estimates from the MODIS data were compared with in situ understory reflectance measurements carried out at an extensive set of forest ecosystem experimental sites across Europe. The reflectance estimates from MODIS data were, hence, tested across diverse forest conditions and phenological phases during the growing season to examine their applicability for ecosystems other than boreal forests. Here we report that the method can deliver good retrievals, especially over different forest types with open canopies (low foliage cover). The performance of the method was found to be limited over forests with closed canopies (high foliage cover), where the signal from understory becomes too attenuated. The spatial heterogeneity of individual field sites and the limitations and documented quality of the MODIS BRDF product are shown to be important for the correct assessment and validation of the retrievals obtained with remote sensing.
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Submitted on : Friday, January 7, 2022 - 3:00:57 PM
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Jan Pisek, Angela Erb, Lauri Korhonen, Tobias Biermann, Arnaud Carrara, et al.. Retrieval and validation of forest background reflectivity from daily Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) data across European forests. Biogeosciences, European Geosciences Union, 2021, 18, pp.621 - 635. ⟨10.5194/bg-18-621-2021⟩. ⟨hal-03516967⟩

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