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Using Sentinel-2-Based Metrics to Characterize the Spatial Heterogeneity of FLEX Sun-Induced Chlorophyll Fluorescence on Sub-Pixel Scale
dc.contributor.author | Jantol, Nela | |
dc.contributor.author | Prikaziuk, Egor | |
dc.contributor.author | Celesti, Marco | |
dc.contributor.author | Hernandez-Sequeira, Itza | |
dc.contributor.author | Tomelleri, Enrico | |
dc.contributor.author | Pacheco-Labrador, Javier | |
dc.contributor.author | Van Wittenberghe, Shari | |
dc.contributor.author | Pla, Filiberto | |
dc.contributor.author | Bandopadhyay, Subhajit | |
dc.contributor.author | Koren, Gerbrand | |
dc.contributor.author | Siegmann, Bastian | |
dc.contributor.author | LEGOVIĆ, TARZAN | |
dc.contributor.author | Kutnjak, Hrvoje | |
dc.contributor.author | Cendrero-Mateo, MaPi | |
dc.date.accessioned | 2023-11-13T17:08:27Z | |
dc.date.available | 2023-11-13T17:08:27Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | JANTOL, Nela, et al. Using Sentinel-2-Based Metrics to Characterize the Spatial Heterogeneity of FLEX Sun-Induced Chlorophyll Fluorescence on Sub-Pixel Scale. Remote Sensing, 2023, 15.19: 4835 | ca_CA |
dc.identifier.issn | 2072-4292 | |
dc.identifier.uri | http://hdl.handle.net/10234/204887 | |
dc.description.abstract | Current and upcoming Sun-Induced chlorophyll Fluorescence (SIF) satellite products (e.g., GOME, TROPOMI, OCO, FLEX) have medium-to-coarse spatial resolutions (i.e., 0.3–80 km) and integrate radiances from different sources into a single ground surface unit (i.e., pixel). However, intrapixel heterogeneity, i.e., different soil and vegetation fractional cover and/or different chlorophyll content or vegetation structure in a fluorescence pixel, increases the challenge in retrieving and quantifying SIF. High spatial resolution Sentinel-2 (S2) data (20 m) can be used to better characterize the intrapixel heterogeneity of SIF and potentially extend the application of satellite-derived SIF to heterogeneous areas. In the context of the COST Action Optical synergies for spatiotemporal SENsing of Scalable ECOphysiological traits (SENSECO), in which this study was conducted, we proposed direct (i.e., spatial heterogeneity coefficient, standard deviation, normalized entropy, ensemble decision trees) and patch mosaic (i.e., local Moran’s I) approaches to characterize the spatial heterogeneity of SIF collected at 760 and 687 nm (SIF760 and SIF687, respectively) and to correlate it with the spatial heterogeneity of selected S2 derivatives. We used HyPlant airborne imagery acquired over an agricultural area in Braccagni (Italy) to emulate S2-like top-of-the-canopy reflectance and SIF imagery at different spatial resolutions (i.e., 300, 20, and 5 m). The ensemble decision trees method characterized FLEX intrapixel heterogeneity best (R2 > 0.9 for all predictors with respect to SIF760 and SIF687). Nevertheless, the standard deviation and spatial heterogeneity coefficient using k-means clustering scene classification also provided acceptable results. In particular, the near-infrared reflectance of terrestrial vegetation (NIRv) index accounted for most of the spatial heterogeneity of SIF760 in all applied methods (R2 = 0.76 with the standard deviation method; R2 = 0.63 with the spatial heterogeneity coefficient method using a scene classification map with 15 classes). The models developed for SIF687 did not perform as well as those for SIF760, possibly due to the uncertainties in fluorescence retrieval at 687 nm and the low signal-to-noise ratio in the red spectral region. Our study shows the potential of the proposed methods to be implemented as part of the FLEX ground segment processing chain to quantify the intrapixel heterogeneity of a FLEX pixel and/or as a quality flag to determine the reliability of the retrieved fluorescence. | ca_CA |
dc.format.extent | 25 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | MDPI | ca_CA |
dc.relation | Proyecto SENSECO | ca_CA |
dc.relation | Proyecto ERC‑2021‑STG PHOTOFLUX | ca_CA |
dc.relation | ‘Integrated Remote Sens. for Biodiversity‑Ecosystem Function’ | ca_CA |
dc.relation.isPartOf | Remote Sensing, 2023, 15.19: 4835 | ca_CA |
dc.rights | © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). | ca_CA |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | ca_CA |
dc.subject | spatial heterogeneity | ca_CA |
dc.subject | vegetation indices | ca_CA |
dc.subject | biophysical traits | ca_CA |
dc.subject | SIF | ca_CA |
dc.subject | hyperspectral sensor | ca_CA |
dc.subject | Sentinel-2 | ca_CA |
dc.subject | FLEX | ca_CA |
dc.subject | Braccagni | ca_CA |
dc.title | Using Sentinel-2-Based Metrics to Characterize the Spatial Heterogeneity of FLEX Sun-Induced Chlorophyll Fluorescence on Sub-Pixel Scale | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | https://doi.org/10.3390/rs15194835 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.relation.publisherVersion | https://www.mdpi.com/2072-4292/15/19/4835 | ca_CA |
dc.type.version | info:eu-repo/semantics/publishedVersion | ca_CA |
project.funder.name | European Cooperation in Science and Technology - COST | ca_CA |
project.funder.name | European Space Agency - ESA | ca_CA |
project.funder.name | Croatian Science Foundation | ca_CA |
project.funder.name | Consejo Europeo de Investigación - ERC | ca_CA |
project.funder.name | Ministerio de Ciencia e Innovación del Gobierno de España | ca_CA |
project.funder.name | ESA Living Planet Fellowship IRS4BEF | ca_CA |
oaire.awardNumber | CA17134 | ca_CA |
oaire.awardNumber | 4000125402/18/NL/NA | ca_CA |
oaire.awardNumber | DOK‑2020‑01‑9841 | ca_CA |
oaire.awardNumber | 101041768 | ca_CA |
oaire.awardNumber | IJC/2018/038039/I | ca_CA |
oaire.awardNumber | 4000125442/18/I-NS | ca_CA |
oaire.awardNumber | 4000140028/22/I-DT-lr | ca_CA |
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Excepto si se señala otra cosa, la licencia del ítem se describe como: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).