0000000000282418

AUTHOR

Roselyne Lacaze

showing 3 related works from this author

GEOV1: LAI, FAPAR essential climate variables and FCOVER global time series capitalizing over existing products. Part 2: Validation and intercomparis…

2013

International audience; This paper describes the scientific validation of the first version of global biophysical products (i.e., leaf area index, fraction of absorbed photosynthetically active radiation and fraction of vegetation cover), namely GEOV1, developed in the framework of the geoland-2/BioPar core mapping service at 1 km spatial resolution and 10-days temporal frequency. The strategy follows the recommendations of the CEOS/WGCV Land Product Validation for LAI global products validation. Several criteria of performance were evaluated, including continuity, spatial and temporal consistency, dynamic range of retrievals, statistical analysis per biome type, precision and accuracy. The…

Accuracy and precision010504 meteorology & atmospheric sciencescouvert végétalcomparaison de modèlesBiomecritère de performanceSoil ScienceMagnitude (mathematics)Context (language use)01 natural sciencesGEOV1;Vegetation variables;Validation;GMES;Land monitoring core servicevalidation scientifiquefraction of absorbed photosynthetically active radiation (fAPAR)GEOV1ValidationfcoverFraction (mathematics)Computers in Earth SciencesLeaf area indexvariable climatiqueMilieux et Changements globauxfraction de couvert0105 earth and related environmental sciencesRemote sensinggmescarte de référenceanalyse statistiquefaparLand monitoring core serviceGeology04 agricultural and veterinary sciencesresolution spatiale15. Life on landComputer scienceLAIindice de surface foliaireSeaWiFSbiome13. Climate actionPhotosynthetically active radiationInformatique (Sciences cognitives)surveillance de l'environnement[SDE]Environmental Sciences040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental scienceVegetation variables
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Crop specific algorithms trained over ground measurements provide the best performance for GAI and fAPAR estimates from Landsat-8 observations

2021

Abstract Estimation of Green Area Index (GAI) and fraction of Absorbed Photosynthetically Active Radiation (fAPAR) from decametric satellites was investigated in this study using a large database of ground measurements over croplands. It covers six main crop types including rice, corn, wheat and barley, sunflower, soybean and other types of crops. Ground measurements were completed using either digital hemispherical cameras, LAI-2000 or AccuPAR devices over sites representative of a decametric pixel. Sites were spread over the globe and the data collected at several growth stages concurrently to the acquisition of Landsat-8 images. Several machine learning techniques were investigated to re…

010504 meteorology & atmospheric sciencesMean squared errorArtificial neural networkCalibration (statistics)0208 environmental biotechnologyEmpirical modellingSoil ScienceGeology02 engineering and technology01 natural sciencesNormalized Difference Vegetation Index020801 environmental engineeringSupport vector machineData pointKrigingComputers in Earth SciencesAlgorithm0105 earth and related environmental sciencesRemote sensingMathematicsRemote Sensing of Environment
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Combining hectometric and decametric satellite observations to provide near real time decametric FAPAR product

2017

Abstract A wide range of ecological, agricultural, hydrological and meteorological applications at local to regional scales requires decametric biophysical data. However, before the launch of SENTINEL-2A, only few decametric products are produced and most of them remain limited by the small number of available observations, mostly due to a moderate revisit frequency combined with cloud occurrence. Conversely, kilometric and hectometric biophysical products are now widely available with almost complete and continuous coverage, but the associated spatial resolution limits the application over heterogeneous landscapes. The objective of this study is to combine unfrequent decametric spatial res…

Point spread functionanalyse de données010504 meteorology & atmospheric sciencesMeteorology[SDV]Life Sciences [q-bio]Real-time computingdata analysis0211 other engineering and technologiesSoil Science02 engineering and technology01 natural sciencesGEOV3Range (statistics)Landsat-8FAPARComputers in Earth Sciencestemps réelImage resolutionphotosynthetically active radiation021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensinganalyse temporellereal timePixelrayonnement photosynthétiquement actifGeologyFunction (mathematics)15. Life on landData fusionSensor fusionDecametricHectometric13. Climate actionPhotosynthetically active radiationtime analysisEnvironmental scienceSatelliteNear real timeobservation satellite
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