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Resultados globales: 34 registros encontrados en 0.01 segundos.
Artículos, Encontrados 32 registros
Contribuciones a jornadas y congresos, Encontrados 1 registros
Documentos de investigación, Encontrados 2 registros
Artículos Encontrados 32 registros  1 - 10siguientefinal  ir al registro:
1.
12 p, 6.4 MB GEOV2 : Improved smoothed and gap filled time series of LAI, FAPAR and FCover 1 km Copernicus Global Land products / Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Sánchez-Zapero, Jorge (The Earth Observation Laboratory (EOLAB)) ; Weiss, Marie (Avignon Université. Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement) ; Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Camacho, Fernando (The Earth Observation Laboratory (EOLAB)) ; Lacaze, Roselyne (Hygeos) ; Baret, Frédéric (Avignon Université. Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement)
Essential vegetation variables including leaf area index (LAI), fraction of absorbed photosynthetic active radiation (FAPAR) and fraction of green vegetation cover (FCover) are produced and distributed in the Copernicus Global Land Service. [...]
2023 - 10.1016/j.jag.2023.103479
International journal of applied earth observation and geoinformation, Vol. 123 (September 2023) , art. 103479  
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2.
17 p, 1.4 MB A comparison of methods for smoothing and gap filling time series of remote sensing observations : application to MODIS LAI products / Kandasamy, Sivasathivel (Institut National de la Recherche Agronomique (França)) ; Baret, Frédéric (Institut National de la Recherche Agronomique (França)) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Neveux, Philippe (Institut National de la Recherche Agronomique (França)) ; Weiss, Marie (Institut National de la Recherche Agronomique (França))
Moderate resolution satellite sensors including MODIS (Moderate Resolution Imaging Spectroradiometer) already provide more than 10 yr of observations well suited to describe and understand the dynamics of earth's surface. [...]
2013 - 10.5194/bg-10-4055-2013
Biogeosciences, Vol 10, Issue 6 (June 2013) , p. 4055-4071  
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3.
47 p, 1.6 MB Green area index from an unmanned aerial system over wheat and rapeseed crops / Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Vigneau, Nathalie (AIRINOV (France)) ; Chéron, Corentin (AIRINOV (France)) ; Gilliot, Jean-Marc (AgroParisTech) ; Comar, Alexis (Institut National de la Recherche Agronomique (França)) ; Baret, Frédéric (Institut National de la Recherche Agronomique (França))
Unmanned airborne systems (UAS) technology opens new horizons in precision agriculture for effective characterization of the variability in crop state at high spatial resolution and high revisit frequency. [...]
2014 - 10.1016/j.rse.2014.06.006
Remote sensing of environment, Vol. 152 (September 2014) , p. 654-664  
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4.
22 p, 863.2 KB Near real-time vegetation monitoring at global scale / Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Baret, Frédéric (Institut National de la Recherche Agronomique (França)) ; Weiss, Marie (Institut National de la Recherche Agronomique (França))
The NRT algorithm for near-real time estimation of global LAI, FAPAR, and FCOVER variables from SPOT/VEGETATION (VGT) satellite data is described here. It consists of three steps: 1) neural networks (NNT) (one for each variable) to provide instantaneous estimates from daily VGT-P reflectances; 2) a multistep filtering approach to eliminate data mainly affected by atmospheric effects and snow cover; and 3) Savitzky-Golay and climatology temporal smoothing and gap filling techniques to ensure consistency and continuity as well as short-term projection of the product dynamics. [...]
2014 - 10.1109/JSTARS.2014.2328632
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 7, no. 8 (August 2014) , p. 3473-3481  
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5.
17 p, 1.1 MB Unprecedented fire activity above the Arctic Circle linked to rising temperatures / Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Gaveau, David L. A. (The TreeMap) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Sheil, Douglas (Wageningen University) ; Naito, Daisuke (Center for International Forestry Research (Indonesia)) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Arctic fires can release large amounts of carbon from permafrost peatlands. Satellite observations reveal that fires burned ~4. 7 million hectares in 2019 and 2020, accounting for 44% of the total burned area in the Siberian Arctic for the entire 1982-2020 period. [...]
2022 - 10.1126/science.abn9768
Science, Vol. 378, Issue 6619 (November 2022) , p. 532-537  
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6.
12 p, 5.9 MB Radiation-constrained boundaries cause nonuniform responses of the carbon uptake phenology to climatic warming in the Northern Hemisphere / Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Yin, Gaofei (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Fu, Yongshuo H. (Beijing Normal University) ; Piao, Shilong (Peking University) ; Janssens, Ivan (University of Antwerp) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Climatic warming has lengthened the photosynthetically active season in recent decades, thus affecting the functioning and biogeochemistry of ecosystems, the global carbon cycle and climate. Temperature response of carbon uptake phenology varies spatially and temporally, even within species, and daily total intensity of radiation may play a role. [...]
2023 - 10.1111/gcb.16502
Global change biology, Vol. 29, Issue 3 (February 2023) , p. 719-730  
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7.
Local interpretation of machine learning models in remote sensing with SHAP : the case of global climate constraints on photosynthesis phenology / Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Yin, Gaofei (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering) ; Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Data-driven models using machine learning have been widely used in remote-sensing applications such as the retrieval of biophysical variables and land cover classification. However, these models behave as a 'black box', meaning that the relationships between the input and predicted variables are hard to interpret. [...]
2023 - 10.1080/01431161.2023.2217982
International Journal of Remote Sensing, Vol. 44, issue 10 (2023) , p. 3160-3173  
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8.
8 p, 931.0 KB Aspect Matters : Unraveling Microclimate Impacts on Mountain Greenness and Greening / Yin, Gaofei (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Xie, Jiangliu (Southwest Jiaotong University) ; Ma, Dujuan (Southwest Jiaotong University) ; Xie, Qiaoyun (The University of Western Australia) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Mountains are vital ecosystems, yet predicting plant growth there is complex due to diverse microclimates on slopes. Equatorial-facing slopes (EFSs) are drier and warmer, and polar-facing slopes (PFSs) are wetter and colder, than their regional macroclimates. [...]
2023 - 10.1029/2023GL105879
Geophysical Research Letters, Vol. 50, Issue 24 (December 2023) , art. e2023GL105879  
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9.
12 p, 1.7 MB Photosynthetically active radiation and foliage clumping improve satellite-based NIRv estimates of gross primary production / Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Descals, Adrià (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Balzarolo, Manuela (Universiteit Antwerpen. Departement Biologie) ; Liu, Guoxiang (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Fang, Hongliang (Chinese Academy of Sciences. Institute of Geographic Sciences and Natural Resources Research) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Monitoring gross primary production (GPP) is necessary for quantifying the terrestrial carbon balance. The near-infrared reflectance of vegetation (NIRv) has been proven to be a good predictor of GPP. [...]
2023 - 10.3390/rs15082207
Remote sensing (Basel), Vol. 15, Issue 8 (April 2023) , art. 2207  
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10.
18 p, 2.3 MB Validation of Sentinel-2, MODIS, CGLS, SAF, GLASS and C3S leaf area index products in maize crops / Yu, Huinan (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering) ; Yin, Gaofei (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Liu, Guoxiang (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering) ; Ye, Yuanxin (Southwest Jiaotong University. Faculty of Geosciences and Environmental Engineering) ; Qu, Yonghua (Chinese Academy of Sciences. Institute of Remote Sensing and Digital Earth) ; Xu, Baodong (Huazhong Agricultural University. Macro Agriculture Research Institute) ; Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals)
We proposed a direct approach to validate hectometric and kilometric resolution leaf area index (LAI) products that involved the scaling up of field-measured LAI via the validation and recalibration of the decametric Sentinel-2 LAI product. [...]
2021 - 10.3390/rs13224529
Remote sensing (Basel), Vol. 13, issue 22 (Nov. 2021) , art 4529  
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Artículos : Encontrados 32 registros   1 - 10siguientefinal  ir al registro:
Contribuciones a jornadas y congresos Encontrados 1 registros  
1.
4 p, 504.9 KB Caracterizacion de la fenología de la vegetación a escala global mediante series temporales SPOT VEGETATION / Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Filella, Iolanda (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Baret, Frédéric (Institut National de la Recherche Agronomique (França)) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
La fenología de la vegetación a escala global se caracterizó a partir de series temporales del índice de área foliar (LAI) SPOT VEGETATION a 1-km de resolución espacial en el periodo 1999-2010. [...]
We characterized the phenology of the vegetation at the global scale from the mean seasonal leaf area index (LAI) estimated from 1-km SPOT VEGETATION time series for 1999-2010. The satellite-derived phenology was spatially consistent with the global distributions of climatic drivers and biome land cover. [...]
2015
Congreso de la Asociación Española de Teledetección. Sevilla, Espanya, 16è : 2015  
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Documentos de investigación Encontrados 2 registros  
1.
11.1 MB Spatio-temporal variability of vegetation phenology and its drivers at global scale / Descals, Adrià ; Peñuelas, Josep, dir. ; Verger Ten, Aleixandre, dir.
La fenologia estudia el moment d'esdeveniments periòdics del cicle de vida a plantes i animals, així com els canvis estacionals climàtics que afecten aquests esdeveniments. En les darreres dècades, l'escalfament global ha provocat canvis en les fenofases i ha allargat la temporada de creixement fotosintètic. [...]
La fenología estudia el momento de eventos periódicos del ciclo de vida en plantas y animales, así como los cambios estacionales climáticos que afectan estos eventos. En las últimas décadas, la el calentamiento global ha provocado cambios en las fenofases y ha alargado la temporada de crecimiento fotosintético. [...]
Phenology is the study of the timing of periodic life-cycle events in plants and animals, as well as how seasonal changes in climatic factors affect these events. In recent decades, temperature has increased, leading to changes in the timing of leaf phenophases and the lengthening of the photosynthetically growing season. [...]
2022  
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2.
173 p, 5.8 MB Study of vegetation dynamics from satellite : phenological responses to climate change / Bórnez Mejías, Kevin ; Peñuelas, Josep, dir. ; Verger, Ten Aleixandre, dir.
La fenologia és la clau per a controlar els processos fisicoquímics i biològics, especialment l'albedo, la rugositat superficial, conductància de les fulles, fluxos de carboni, aigua i energia. Per tant, l'estimació de la fenologia és cada vegada més important per a comprendre els efectes del canvi climàtic en els ecosistemes i les interaccions biosfera-atmosfera. [...]
La fenología es clave para controlar los procesos fisicoquímicos y biológicos, especialmente el albedo, la rugosidad superficial, conductancia de las hojas, flujos de carbono, agua y energía. Por lo tanto, la estimación de la fenología es cada vez más importante para comprender los efectos del cambio climático en los ecosistemas y las interacciones biosfera-atmósfera. [...]
Phenology is key to control physicochemical and biological processes, especially albedo, surface roughness, canopy conductance and fluxes of carbon, water and energy. High-quality retrieval of land surface phenology (LSP) is thus increasingly important for understanding the effects of climate change on ecosystem function and biosphere-atmosphere interactions. [...]
2021  
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