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Recent Progress in Remote Sensing of Terrestrial and Aquatic Fluorescence

A special issue of Remote Sensing (ISSN 2072-4292). This special issue belongs to the section "Remote Sensing in Agriculture and Vegetation".

Deadline for manuscript submissions: closed (31 October 2019) | Viewed by 30552

Special Issue Editors


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Guest Editor
Department of Geography, University of Zurich, Winterthurerstrasse, 1908057 Zurich, Switzerland
Interests: fluorescence spectroscopy; remote sensing of vegetation; plant–water relations; carbon and water cycle; plant photosynthesis; ecosystem functioning and environmental change
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Guest Editor
IBG-2: Plant Sciences, Institute of Bio- und Geosciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Interests: ecophysiology of photosynthesis; plant stress physiology; field phenotyping; optical remote sensing; understanding of sun-induced fluorescence; high-resolution imaging spectroscopy
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Guest Editor
Department of Environmental Sciences, University of Milano-Bicocca, 20126 Milano, Italy
Interests: remote sensing; imaging spectroscopy; sun-induced chlorophyll fluorescence; land surface modelling; environmental monitoring; calibration/validation field campaigns

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Guest Editor
European Space Research and Technology Centre, European Space Agency, 2201 Noordwijk, The Netherlands
Interests: boundary layer meteorology; numerical weather prediction; remote sensing; fluorescence; calibration/validation field campaigns

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Guest Editor
Mission Science Division (EOP-SME) European Space Agency, ESTEC, Directorate of Earth Observation Programmes Postbus 299, 2200 AG Noordwijk, The Netherlands
Interests: land surface hydrology; data assimilation; numerical weather forecasting; remote sensing; space system engineering; fluorescence
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Special Issue Information

Dear Colleagues,

With the Fluorescence Explorer (FLEX)—Sentinel-3 tandem mission in its implementation phase and fluorescence measurements becoming increasingly available from missions like OCO-2 and Sentinel-5p, remote sensing of fluorescence has been established as important and complementary Earth observation resource to assess complex processes in terrestrial and aquatic ecosystems.

The meeting of the International Network on Remote Sensing of Terrestrial and Aquatic Fluorescence, held in Davos, Switzerland from 5th to 8th March 2019 follows a series of events addressing the remote sensing of vegetation fluorescence and will focus on the latest developments of this topic.

As a follow-up to this event, we are calling for papers on the work presented at the meeting. In addition to this, we welcome papers from the global research community actively involved in research involving fluorescence remote sensing. As such, the Special Issue is open to anyone doing research in this field. The selection of papers for publication will depend on quality and rigor of research. Specific topics include but are not limited to the following:

  • Emerging passive and active sensors (field, airborne, and satellite);
  • Sun-induced chlorophyll fluorescence retrieval methods over land and water;
  • Retrieval algorithms of biophysical parameters (including the future FLEX and Sentinel-3 tandem mission concept);
  • Modelling chlorophyll fluorescence emission;
  • Combining models and observations across spatial and temporal scales;
  • Analyses and results from Sentinel-3 measurements (including the tandem phase of the Sentinel-3 A and B units in summer 2018);
  • Validation activities, field studies, and campaigns related to land and water fluorescence studies;
  • Applications of fluorescence in stress detection in agriculture and forestry;
  • Linking fluorescence and ecosystem processes including gross primary productivity and transpiration;
  • Fluorescence for aquatic research over coastal and inland waters.

Prof. Alexander Damm
Prof. Uwe Rascher
Prof. Roberto Colombo
Dr. Dirk Schuettemeyer
Dr. Matthias Drusch
Guest Editors

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Published Papers (5 papers)

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Research

30 pages, 17721 KiB  
Article
The High-Performance Airborne Imaging Spectrometer HyPlant—From Raw Images to Top-of-Canopy Reflectance and Fluorescence Products: Introduction of an Automatized Processing Chain
by Bastian Siegmann, Luis Alonso, Marco Celesti, Sergio Cogliati, Roberto Colombo, Alexander Damm, Sarah Douglas, Luis Guanter, Jan Hanuš, Kari Kataja, Thorsten Kraska, Maria Matveeva, Jóse Moreno, Onno Muller, Miroslav Pikl, Francisco Pinto, Juan Quirós Vargas, Patrick Rademske, Fernando Rodriguez-Morene, Neus Sabater, Anke Schickling, Dirk Schüttemeyer, František Zemek and Uwe Rascheradd Show full author list remove Hide full author list
Remote Sens. 2019, 11(23), 2760; https://doi.org/10.3390/rs11232760 - 23 Nov 2019
Cited by 60 | Viewed by 7357
Abstract
The HyPlant imaging spectrometer is a high-performance airborne instrument consisting of two sensor modules. The DUAL module records hyperspectral data in the spectral range from 400–2500 nm, which is useful to derive biochemical and structural plant properties. In parallel, the FLUO module acquires [...] Read more.
The HyPlant imaging spectrometer is a high-performance airborne instrument consisting of two sensor modules. The DUAL module records hyperspectral data in the spectral range from 400–2500 nm, which is useful to derive biochemical and structural plant properties. In parallel, the FLUO module acquires data in the red and near infrared range (670–780 nm), with a distinctly higher spectral sampling interval and finer spectral resolution. The technical specifications of HyPlant FLUO allow for the retrieval of sun-induced chlorophyll fluorescence (SIF), a small signal emitted by plants, which is directly linked to their photosynthetic efficiency. The combined use of both HyPlant modules opens up new opportunities in plant science. The processing of HyPlant image data, however, is a rather complex procedure, and, especially for the FLUO module, a precise characterization and calibration of the sensor is of utmost importance. The presented study gives an overview of this unique high-performance imaging spectrometer, introduces an automatized processing chain, and gives an overview of the different processing steps that must be executed to generate the final products, namely top of canopy (TOC) radiance, TOC reflectance, reflectance indices and SIF maps. Full article
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22 pages, 3399 KiB  
Article
Nitrogen and Phosphorus Effect on Sun-Induced Fluorescence and Gross Primary Productivity in Mediterranean Grassland
by David Martini, Javier Pacheco-Labrador, Oscar Perez-Priego, Christiaan van der Tol, Tarek S. El-Madany, Tommaso Julitta, Micol Rossini, Markus Reichstein, Rune Christiansen, Uwe Rascher, Gerardo Moreno, M. Pilar Martín, Peiqi Yang, Arnaud Carrara, Jinhong Guan, Rosario González-Cascón and Mirco Migliavacca
Remote Sens. 2019, 11(21), 2562; https://doi.org/10.3390/rs11212562 - 31 Oct 2019
Cited by 23 | Viewed by 5189
Abstract
Sun-Induced fluorescence at 760 nm (F760) is increasingly being used to predict gross primary production (GPP) through light use efficiency (LUE) modeling, even though the mechanistic processes that link the two are not well understood. We analyzed the effect of nitrogen [...] Read more.
Sun-Induced fluorescence at 760 nm (F760) is increasingly being used to predict gross primary production (GPP) through light use efficiency (LUE) modeling, even though the mechanistic processes that link the two are not well understood. We analyzed the effect of nitrogen (N) and phosphorous (P) availability on the processes that link GPP and F760 in a Mediterranean grassland manipulated with nutrient addition. To do so, we used a combination of process-based modeling with Soil-Canopy Observation of Photosynthesis and Energy (SCOPE), and statistical analyses such as path modeling. With this study, we uncover the mechanisms that link the fertilization-driven changes in canopy nitrogen concentration (N%) to the observed changes in F760 and GPP. N addition changed plant community structure and increased canopy chlorophyll content, which jointly led to changes in photosynthetic active radiation (APAR), ultimately affecting both GPP and F760. Changes in the abundance of graminoids, (%graminoids) driven by N addition led to changes in structural properties of the canopy such as leaf angle distribution, that ultimately influenced observed F760 by controlling the escape probability of F760 (Fesc). In particular, we found a change in GPP–F760 relationship between the first and the second year of the experiment that was largely driven by the effect of plant type composition on Fesc, whose best predictor is %graminoids. The P addition led to a statistically significant increase on light use efficiency of fluorescence emission (LUEf), in particular in plots also with N addition, consistent with leaf level studies. The N addition induced changes in the biophysical properties of the canopy that led to a trade-off between surface temperature (Ts), which decreased, and F760 at leaf scale (F760leaf,fw), which increased. We found that Ts is an important predictor of the light use efficiency of photosynthesis, indicating the importance of Ts in LUE modeling approaches to predict GPP. Full article
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27 pages, 5096 KiB  
Article
Global Sensitivity Analysis of the SCOPE Model in Sentinel-3 Bands: Thermal Domain Focus
by Egor Prikaziuk and Christiaan van der Tol
Remote Sens. 2019, 11(20), 2424; https://doi.org/10.3390/rs11202424 - 18 Oct 2019
Cited by 25 | Viewed by 5297
Abstract
Sentinel-3 satellite has provided simultaneous observations in the optical (visible, near infrared (NIR), shortwave infrared (SWIR)) and thermal infrared (TIR) domains since 2016, with a revisit time of 1–2 days. The high temporal resolution and spectral coverage make the data of this mission [...] Read more.
Sentinel-3 satellite has provided simultaneous observations in the optical (visible, near infrared (NIR), shortwave infrared (SWIR)) and thermal infrared (TIR) domains since 2016, with a revisit time of 1–2 days. The high temporal resolution and spectral coverage make the data of this mission attractive for vegetation monitoring. This study explores the possibilities of using the Soil Canopy Observation, Photochemistry and Energy fluxes (SCOPE) model together with Sentinel-3 to exploit the two sensors onboard of Sentinel-3 (the ocean and land color instrument (OLCI) and sea and land surface temperature radiometer (SLSTR)) in synergy. Sobol’ variance based global sensitivity analysis (GSA) of top of atmosphere (TOA) radiance produced with a coupled SCOPE-6S model was conducted for optical bands of OLCI and SLSTR, while another GSA of SCOPE was conducted for the land surface temperature (LST) product of SLSTR. The results show that in addition to ESA level-2 Sentinel-3 products, SCOPE is able to retrieve leaf area index (LAI), leaf chlorophyll content (Cab), leaf water content (Cw), leaf senescent material (Cs), leaf inclination distribution (LAD). Leaf dry matter content (Cdm) and soil brightness, despite being important, were not confidently retrieved in some cases. GSA of LST in TIR domain showed that plant biochemical parameters—maximum carboxylation rate (Vcmax) and stomata conductance-photosynthesis slope (Ball-Berry m)—can be constrained if prior information on near-surface weather conditions is available. We conclude that the combination of optical and thermal domains facilitates the constraint of the land surface energy balance using SCOPE. Full article
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22 pages, 4608 KiB  
Article
A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance
by Sergio Cogliati, Marco Celesti, Ilaria Cesana, Franco Miglietta, Lorenzo Genesio, Tommaso Julitta, Dirk Schuettemeyer, Matthias Drusch, Uwe Rascher, Pedro Jurado and Roberto Colombo
Remote Sens. 2019, 11(16), 1840; https://doi.org/10.3390/rs11161840 - 7 Aug 2019
Cited by 41 | Viewed by 5740
Abstract
Retrieval of Sun-Induced Chlorophyll Fluorescence (F) spectrum is one of the challenging perspectives for further advancing F studies towards a better characterization of vegetation structure and functioning. In this study, a simplified Spectral Fitting retrieval algorithm suitable for retrieving the F [...] Read more.
Retrieval of Sun-Induced Chlorophyll Fluorescence (F) spectrum is one of the challenging perspectives for further advancing F studies towards a better characterization of vegetation structure and functioning. In this study, a simplified Spectral Fitting retrieval algorithm suitable for retrieving the F spectrum with a limited number of parameters is proposed (two parameters for F). The novel algorithm is developed and tested on a set of radiative transfer simulations obtained by coupling SCOPE and MODTRAN5 codes, considering different chlorophyll content, leaf area index and noise levels to produce a large variability in fluorescence and reflectance spectra. The retrieval accuracy is quantified based on several metrics derived from the F spectrum (i.e., red and far-red peaks, O2 bands and spectrally-integrated values). Further, the algorithm is employed to process experimental field spectroscopy measurements collected over different crops during a long-lasting field campaign. The reliability of the retrieval algorithm on experimental measurements is evaluated by cross-comparison with F values computed by an independent retrieval method (i.e., SFM at O2 bands). For the first time, the evolution of the F spectrum along the entire growing season for a forage crop is analyzed and three diverse F spectra are identified at different growing stages. The results show that red F is larger for young canopy; while red and far-red F have similar intensity in an intermediate stage; finally, far-red F is significantly larger for the rest of the season. Full article
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26 pages, 6760 KiB  
Article
Hyplant-Derived Sun-Induced Fluorescence—A New Opportunity to Disentangle Complex Vegetation Signals from Diverse Vegetation Types
by Subhajit Bandopadhyay, Anshu Rastogi, Uwe Rascher, Patrick Rademske, Anke Schickling, Sergio Cogliati, Tommaso Julitta, Alasdair Mac Arthur, Andreas Hueni, Enrico Tomelleri, Marco Celesti, Andreas Burkart, Marcin Stróżecki, Karolina Sakowska, Maciej Gąbka, Stanisław Rosadziński, Mariusz Sojka, Marian-Daniel Iordache, Ils Reusen, Christiaan Van Der Tol, Alexander Damm, Dirk Schuettemeyer and Radosław Juszczakadd Show full author list remove Hide full author list
Remote Sens. 2019, 11(14), 1691; https://doi.org/10.3390/rs11141691 - 17 Jul 2019
Cited by 23 | Viewed by 6202
Abstract
Hyperspectral remote sensing (RS) provides unique possibilities to monitor peatland vegetation traits and their temporal dynamics at a fine spatial scale. Peatlands provide a vital contribution to ecosystem services by their massive carbon storage and wide heterogeneity. However, monitoring, understanding, and disentangling the [...] Read more.
Hyperspectral remote sensing (RS) provides unique possibilities to monitor peatland vegetation traits and their temporal dynamics at a fine spatial scale. Peatlands provide a vital contribution to ecosystem services by their massive carbon storage and wide heterogeneity. However, monitoring, understanding, and disentangling the diverse vegetation traits from a heterogeneous landscape using complex RS signal is challenging, due to its wide biodiversity and distinctive plant species composition. In this work, we aim to demonstrate, for the first time, the large heterogeneity of peatland vegetation traits using well-established vegetation indices (VIs) and Sun-Induced Fluorescence (SIF) for describing the spatial heterogeneity of the signals which may correspond to spatial diversity of biochemical and structural traits. SIF originates from the initial reactions in photosystems and is emitted at wavelengths between 650–780 nm, with the first peak at around 687 nm and the second peak around 760 nm. We used the first HyPlant airborne data set recorded over a heterogeneous peatland area and its surrounding ecosystems (i.e., forest, grassland) in Poland. We deployed a comparative analysis of SIF and VIs obtained from differently managed and natural vegetation ecosystems, as well as from diverse small-scale peatland plant communities. Furthermore, spatial relationships between SIF and VIs from large-scale vegetation ecosystems to small-scale peatland plant communities were examined. Apart from signal variations, we observed a positive correlation between SIF and greenness-sensitive VIs, whereas a negative correlation between SIF and a VI sensitive to photosynthesis was observed for large-scale vegetation ecosystems. In general, higher values of SIF were associated with higher biomass of vascular plants (associated with higher Leaf Area Index (LAI)). SIF signals, especially SIF760, were strongly associated with the functional diversity of the peatland vegetation. At the peatland area, higher values of SIF760 were associated with plant communities of high perennials, whereas, lower values of SIF760 indicated peatland patches dominated by Sphagnum. In general, SIF760 reflected the productivity gradient on the fen peatland, from Sphagnum-dominated patches with the lowest SIF and fAPAR values indicating lowest productivity to the Carex-dominated patches with the highest SIF and fAPAR values indicating highest productivity. Full article
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