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Registros recuperados: 17
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Accounting for atmospheric boundary layer variability on flux estimation from RS observations Inra
Timmermans, W.J.; Bertoldi, G.; Albertson, J.D.; Olioso, A.; Su, Z.; Gieske, A.S.M..
A Large Eddy Simulation (LES) model is coupled to a remote-sensing-basedSVAT that accounts for soil and vegetation in order to study the feedback effectsbetween surface state and spatial variability in fluxes, through the induction ofspatial variability in the lower atmosphere. As such, this study focuses on sensibleheat flux exchange. The simulations indicated that changes are introduced to theflux distributions mainly at higher surface temperatures. A scale-dependentmethod is presented to account for feedback effects. This showed the mostsignificant correlation between surface and air temperature at scales from 500 to1000m and modulated the spatial variance of sensible heat flux. This suggeststhat feedback effects act to limit the spatial variability in...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; MODELLING; LARGE EDDY SIMULATION; LES; SVAT; HEAT FLUX EXCHANGE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200838de219f&uri=/notices/prodinra1/2008/09/
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Analyse rétrospective par télédétection de l'évolution du dépérissement des Sapins pectinés (abies alba) sur le Mont Ventoux Inra
Lavorini, D..
Les changements climatiques de ces dernières années poussent les gestionnaires forestiers à étudier leurs effets sur les peuplements forestiers. Entre autre, cette interrogation se pose pour les sapinières des zones de montagnes méditerranéennes où des dépérissements ont été notés depuis les années 2000.Le principal objectif de cette étude est de détecter et de cartographier les dépérissements des Sapins pectinés constatés sur le versant Nord du massif du Mont-Ventoux (84), situé dans le Sud de la France. Pour ce faire, la télédétection à haute résolution spatiale est un outil bien approprié puisque qu’elle permet d’observer la répartition spatiale de la végétation sur des périodes relativement longues. Dans cette étude, nous avons exploité une série...
Tipo: Thesis Palavras-chave: CORRECTION ATMOSPHERIQUE; CORRECTION GEOMETRIQUE; SUIVI DE LA VEGETATION CLIMATE CHANGE; REMOTE SENSING; VEGETATION MONITORING; VEGETATION INDEX; GEOMETRICAL CORRECTIONS; ATMOSPHERIC CORRECTIONS; SILVER FIR; FOREST TREE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010c0aee4d1&uri=/notices/prodinra1/2010/08/
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Assessing land-use and carbon stock in slash-and-burn ecosystems in tropical mountain of Laos based on time-series satellite images Inra
Inoue, Y.; Kiyono, Y.; Asai, H.; Ochiai, Y.; Qi, J.; Olioso, A.; Shiraiwa, T.; Horie, H.; Saito, T.; Dounagsavanh, L..
In the tropical mountains of Southeast Asia, slash-and-burn (S/B) agriculture is a widely practiced and important food production system. The ecosystem carbon stock in this land-use is linked not only to the carbon exchange with the atmosphere but also with food and resource security. The objective of this study was to provide quantitative information on the land-use and ecosystem carbon stock in the region as well as to infer the impacts of alternative land-use and ecosystem management scenarios on the carbon sequestration potential at a regional scale. The study area was selected in a typical slash-and-burn region in the northern part of Laos. The chrono-sequential changes of land-use such as the relative areas of community age and cropping (C) + fallow...
Tipo: Journal Article Palavras-chave: STOCK DE CARBONE; BRULIS CARBON SEQUESTRATION; REMOTE SENSING; SHIFTING CULTIVATION; SLASH-AND-BURN.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20104a22ea78&uri=/notices/prodinra1/2010/07/
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Assessing the potentialities of FORMOSAT-2 data for water and crop monitoring at small regional scale in south-eastern France Inra
Courault, D.; Bsaibes, A.; Kpemlie, E.; Hadria, R.; Hagolle, O.; Marloie, O.; Hanocq, J.F.; Olioso, A.; Bertrand, N.; Desfonds, V..
Water monitoring at the scale of a small agricultural region is a key point to insure a good crop development particularly in South-Eastern France, where extremeclimatic conditions result in long dry periods in spring and summer with very sparseprecipitation events, corresponding to a crucial period of crop development. Remotesensing with the increasing imagery resolution is a useful tool to provide information on plant water status over various temporal and spatial scales. The current study focussed on assessing the potentialities of FORMOSAT-2 data, characterized by high spatial (8m pixel)and temporal resolutions (1-3 day/time revisit), to improve crop modeling and spatial estimation of the main land properties. Thirty cloud free images were acquired...
Tipo: Journal Article Palavras-chave: CONTROLE HYDRIQUE SURFACE TEMPERATURE; ALBEDO; LAI; CROP MONITORING; PLANT WATER SATUS; REMOTE SENSING; AGRICUTURAL PRACTICE; WATER MONITORING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008e80e974e&uri=/notices/prodinra1/2008/07/
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Assimilation variationnelle de données de télédétection dans des modèles de fonctionnement des couverts végétaux et du paysage agricole Inra
Kpemlie, E.K..
La connaissance du microclimat et de l'évapotranspiration ou flux de chaleur latente qui représente la consommation réelle en eau de la culture à l'échelle des parcelles agricoles est une donnée importante pour comprendre le développement des cultures. La plupart des modèles permettant d'estimer l'évapotranspiration sont utilisés sur des surfaces homogènes sans tenir compte des interactions surface - atmosphère et de la variabilité spatiale du domaine agricole. Nous avons utilisé un modèle de couche limite atmosphérique afin de prendre en compte ces interactions. Une approche dite « patchée » permet d'introduire la variabilité spatiale des surfaces dans le modèle à partir des diverses proportions et des caractéristiques des principaux couverts végétaux qui...
Tipo: Thesis Palavras-chave: RUGOSITE DE SURFACE; TEMPERATURE DE SURFACE SOIL MOISTURE; REMOTE SENSING; WATER BUDGET; SURFACE ROUGHNESS; SURFACE TEMPERATURE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20118d722eb6&uri=/notices/prodinra1/2011/01/
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Cartographie et mesure de la biodiversité du Mont Ventoux. Approche par Système d’Information Géographique et Télédétection, préconisations méthodologiques et application pour l’aménagement forestier Inra
Mafhoud, I..
Les données issues de la télédétection couplées à des approches de type système d’information géographique sont d’un grand intérêt potentiel pour l’aménagement forestier. Le but de cette recherche est dans un premier temps de fournir une cartographie utilisable des espèces forestières dominantes à l'échelle du pixel, en utilisant des méthodes éprouvées de la télédétection. Le site d’étude choisi est le versant sud du Mont Ventoux, une montagne méditerranéenne présentant une forte biodiversité forestière. Les travaux relatés dans la première partie ont permis de réaliser des cartographies discriminantes des espèces forestières à partir des données satellitaires (Spot 5) par classification supervisée et non supervisée, en lien avec des relevés terrains. La...
Tipo: Thesis Palavras-chave: CLASSIFICATION SUPERVISEE; BANDE SPECTRALE; RESOLUTION SPATIALE; INDICE DE VEGETATION; INDICE DE SHANNON; INDICE DE SIMPSON; ECHELLE; AGREGATION; SUPPORT SPATIAL BIODIVERSITY; FOREST MANAGEMENT; FOREST TREE; REMOTE SENSING; CARTOGRAPHY; GIS; VEGETATION INDEX.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010509f2446&uri=/notices/prodinra1/2010/03/
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Directional anisotropy in thermal infrared measurements over Toulouse city centre during the CAPITOUL measurement campaigns: first results Inra
Lagouarde, J.P.; Irvine, M.R..
The measurements of surface temperature are prone to important directional anisotropy related to the structure of the canopy and the radiative and energy exchanges inside of it. Directional effects must be taken into account for a number of practical applications such as the correction of large swath satellite data, the assimilation of thermal infrared (TIR) measurements in surface models, the design of future spatial missions… For urban canopies, experimental measurements of TIR directional anisotropy previously performed during summer days over Marseille in the framework of the ESCOMPTE campaign (2001) revealed significant angular surface temperature variations with noticeable hot spot effects whose intensity was related to the canopy structure. The...
Tipo: Journal Article Palavras-chave: INFRAROUGE THERMIQUE; TEMPERATURE DE SURFACE; PROJET CAPITOUL; ANISOTROPIE DIRECTIONNELLE IR THERMOGRAPHY; REMOTE SENSING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200857e10177&uri=/notices/prodinra1/2009/02/
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Effective soil moisture sampling depth of L-band radiometry Inra
Escorihuela, M.J.; Kerr, Y.H.; Chanzy, A.; Wigneron, J.P..
Tipo: Journal Article Palavras-chave: HUMIDITE DU SOL; RADIOMETRIE SOIL MOISTURE; PASSIVE MICROWAVE; RADIATIVE TRANSFER MODEL; REMOTE SENSING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200997073f0a&uri=/notices/prodinra1/2011/02/
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Evaluation of the surface energy balance system (SEBS) applied to ASTER imagery with flux-measurements at the SPARC 2004 site (Barrax, Spain) Inra
van der Kwast, J.; TIMMERMANS, A.; Gieske, A.; SU, Z.; Olioso, A.; Jia, L.; Elbers, J.; Karssenberg, D.; de Jong, S..
Accurate quantification of the amount and spatial variation of evapotranspiration is important in a wide range of disciplines. Remote sensing based surface energy balance models have been developed to estimate turbulent surface energy fluxes at different scales. The objective of this study is to evaluate the Surface Energy Balance System (SEBS) model on a landscape scale, using tower-based flux measurements at different land cover units during an overpass of the ASTER sensor over the SPARC 2004 experimental site in Barrax (Spain). Additionally, the effect of replacement of empirical roughness functions in the model by field estimates or literature values is investigated. Modelled fluxes correspond better with flux measurements over uniform land cover...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; ENERGY BALANCE; MODELLING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200914bcdc5e&uri=/notices/prodinra1/2011/02/
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Future directions for advanced evapotranspiration modeling: assimilation of remote sensing data into crop simulation models and SVAT models Inra
Olioso, A.; Inoue, Y.; Ortega-Farias, S.; Demarty, J.; Wigneron, J.P.; Braud, I.; Jacob, F.; Lecharpentier, P.; Ottlé, C.; Calvet, J.C.; Brisson, N..
Soil-Vegetation-Atmosphere Transfer Models (SVAT) and Crop Simulation Models describe physical and physiological processes occurring in crop canopies. Remote sensing data may be used through assimilation procedures for constraining or driving SVAT and crop models. These models provide continuous simulation of processes such as evapotranspiration and, thus, direct means for interpolating evapotranspiration between remote sensing data acquisitions (which is not the case for classical evapotranspiration mapping methods). They also give access to variables other than evapotranspiration, such as soil moisture and crop production. We developed the coupling between crop, SVAT and radiative transfer models in order to implement assimilation procedures in various...
Tipo: Journal Article Palavras-chave: ASSIMILATION DE DONNÉES; SIMULATION DE CULTURE; HUMIDITÉ ASSIMILATION OF DATA INTO MODELS; CROP SIMULATION MODEL; EVAPOTRANSPIRATION; IRRIGATION; REMOTE SENSING; SOIL; VEGETATION; ATMOSPHERE TRANSFER MODEL.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0600036125111436&uri=/notices/prodinra1/2010/11/
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Interpretation of multi-season, multiyear color imagery for a continental-shelf region ArchiMer
Topliss, Bj; Payzant, La; Hurley, Pcf; Miller, Jr; Freemantle, J.
A comparison was made between multi-year, multi-season cruise information from the surface waters of the Scotian shelf and satellite imagery from the Coastal Zone Colour Scanner (CZCS). The colour imagery was able to identify several physical processes on the shelf (such as outflows and upwelling) to approximately the same degree as previously reported with thermal imagery. Because processing CZCS data requires the use of atmospheric and marine models defined by a range of input parameters, the various processing steps and assumptions were evaluated for potential impact on any marine interpretation of the imagery. The shelf waters were not a pure oceanic water mass throughout the year and turbidity levels were found to be the most significant interfering...
Tipo: Text Palavras-chave: SHELF SEA; REMOTE SENSING; TURBIDITY.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00103/21381/18981.pdf
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Première évaluation des potentialités du satellite Spot pour la cartographie des peuplements benthiques superficiels de Méditerranée occidentale ArchiMer
Meinesz, Alexandre; Belsher, Thomas; Boudouresque, Charles-françois; Lefevre, Jean-robert.
A Spot satellite image was processed to assess the suitability of this facility for the cartography of epibenthic populations and bottom types in the Mediterranean sublittoral fringe. The area studied was on the north coast of Porquerolles island (Hyeres, SE France). The treated data were compared with mapping carried out by diving. We show that satellite remote sensing may permit a distinction between certain epibenthic populations and bottom types down to 10 m depth. Thus the usefulness of the satellite is reduced where the sublittoral is steeply shelving, as the mappable area is narrow and represented by only a few pixels, each of which tends to overlap several separate biocoenoses. The image treated was obtained in June under very favourable...
Tipo: Text Palavras-chave: POSIDONIA-OCEANICA; MAPPING; REMOTE SENSING; SPOT.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00183/29397/27762.pdf
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Quantifying spatial heterogeneity at the landscape scale using variogram models Inra
Garrigues, S.; Allard, D.; Baret, F.; Weiss, M..
The monitoring of earth surface dynamic processes at a global scale requires high temporal frequency remote sensing observations which are provided up to now by moderate spatial resolution sensors. However, the spatial heterogeneity within the moderate spatial resolution pixel biases non-linear estimation processes of land surface variables from remote sensing data. To limit its influence on the description of land surface processes, corrections based on the quantification of the intra-pixel heterogeneity may be applied to non-linear estimation processes. A complementary strategy is to define the proper pixel size to capture the spatial variability of the data and minimize the intra-pixel variability. This work provides a methodology to characterize and...
Tipo: Journal Article Palavras-chave: MODELE DE VARIOGRAMME; RESOLUTION SPATIALE; REPARTITION SPATIALE; NDVI; FORET; IMAGE NUMERISEE VARIOGRAM MODEL; LANDSCAPE; LENGTH SCALE; DATA REGULARIZATION; OPTIMAL SPATIAL RESOLUTION; REMOTE SENSING; SPATIAL HETEROGENEITY; MODERATE SPATIAL RESOLUTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20078d71d345&uri=/notices/prodinra1/2007/08/
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Remote sensing and detection of nitrogen status in crops. Application to precise nitrogen fertilization Inra
Guerif, M.; Houlès, V.; Baret, F..
Remote sensing techniques offer a unique solution for mapping the growth and nitrogen status of crops and monitoring its time course. Therefore these maps are powerful tools for recommending spatially precise cultural practices, and particularly nitrogen dressing. In this paper, we review the main issues to be addressed for estimating crop variables from remote sensing and for using them for managing variable rate fertilizer application.The derivation of canopy state variables such as the leaf area index (LAI) and chlorophyll content (Cab) is first addressed. It is demonstrated that the inversion of radiative transfer models leads to useful estimates of these variables. However, because of the ill-posed nature of the inverse problem, better accuracy is...
Tipo: Meeting Paper Palavras-chave: CHLOROPHYLLE NITROGEN; CHLOROPHYLL; LEAF AREA INDEX; LAI; FERTILIZATION; REMOTE SENSING; CROP MODEL; PRECISION AGRICULTURE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200795287ab1&uri=/notices/prodinra1/2010/11/
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Review on estimation of evapotranspiration from remote sensing data : from empirical to numerical modeling approaches Inra
Courault, D.; Seguin, B.; Olioso, A..
Different methods have been developed to estimate evapotranspiration from remote sensing data, from empirical approaches such as the simplified relationship to complex methods based on remote sensing data assimilation along with SVAT models. The simplified relationship has been applied from small spatial scale using airborne TIR images to continental scale with NOAA data. Assimilation procedures often require remote sensing data over different spectral domains to retrieve input parameters which characterize surface properties such as albedo, emissivity or Leaf Area Index. A brief review of these different approaches is presented, with a discussion about the main physical bases and assumptions of various models. The paper reports also some examples and...
Tipo: Journal Article Palavras-chave: ALBEDO; EMISSIVITE; FLUX DE SURFACE; RESEDA DES ALPILLES EVAPOTRANSPIRATION; OPERATIONAL APPLICATION; REMOTE SENSING; SIMPLIFIED MODEL; SVAT MODEL.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200931705946&uri=/notices/prodinra1/2010/11/
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Thermal remote sensing from Airborne Hyperspectral Scanner data in the framework of the SPARC and SEN2FLEX projects: an overview Inra
Sobrino, J.A.; Jiménez-Muñoz, J.C.; Zarco-Tejada, P.J.; Sepulcre-Cantó, G.; de Miguel, E.; Soria, E.; Romaguera, M.; Julien, Y.; Cuenca, J.; Hidalgo, V.; Franch, B.; Mattar, C.; Morales, L.; Gillespie, A.; Sabol, D.; Balick, L.; Su, Z.; Jia, L.; Gieske, A.; Timmermans, W.; Olioso, A.; Nerry, F.; Guanter, L.; Moreno, J.; Shen, Q..
The AHS (Airborne Hyperspectral Scanner) instrument has 80 spectral bands covering the visible and near infrared (VNIR), short wave infrared (SWIR), mid infrared (MIR) and thermal infrared (TIR) spectral range. The instrument is operated by Instituto Nacional de Técnica Aerospacial (INTA), and it has been involved in several field campaigns since 2004.This paper presents an overview of the work performed with the AHS thermal imagery provided in the framework of the SPARC and SEN2FLEX campaigns, carried out respectively in 2004 and 2005 over an agricultural area in Spain. The data collected in both campaigns allowed for the first time the development and testing of algorithms for land surface temperature and emissivity retrieval as well as the estimation of...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; SURFACE TEMPERATURE; INFRARED.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011facebc7d&uri=/notices/prodinra1/2011/02/
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Using first- and second-order variograms for characterizing landscape spatial structures from remote sensing imagery Inra
Garrigues, S.; Allard, D.; Baret, F..
The spatial structures displayed by remote sensing imagery are essential information characterizing the nature and the scale of spatial variation of Earth surface processes. This paper provides a new approach to characterize the spatial structures within remote sensing imagery using stochastic models an geostatistic metrics. Up to now, the second-order variogram has been widely used to describe the spatial variations within an image. In this paper, we demonstrate its limitation to discriminate distinct image spatial structures. We introduce a different geostatistic metric, the first-order variogram, which used in combination with the second-order variogram, will prove its efficiency to describe the image spatial structures. We then develop a method based...
Tipo: Journal Article Palavras-chave: SIMULATION STOCHASTIQUE; VARIOGRAMME; GEOSTATISTIQUE VARIOGRAM; LANDSCAPE STRUCTURE; REMOTE SENSING; MULTI-GAUSSIAN MODEL; POISSON LINE MOSAIC MODEL; STOCHASTIC SIMULATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008c3cd7620&uri=/notices/prodinra1/2008/07/
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