Consulta: subjectFacets:"Télédétection"
Registros recuperados: 28
Data/hora: 01/06/2024 11:31:12

Mesures de turbidité satellitaire des eaux fortement chargées en MES – Utilisation de l’algorithme OC5-HT en Guyane française
Provedor de dados: 5
Autores: Lampert, Luis; Gohin, Francis; Bryere, Philippe.
The study of the monitored parameters for the WFD directive in French Guiana, enabled us to develop a turbidity algorithm for better characterize coastal waters with high suspended matters. The OC5-HT algorithm answer to this request.
Tipo: Text
Palavras-chave: Guyane française; DCE; Turbidité; Télédétection.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00373/48427/48669.pdf

Estimations satellitales de la couleur de l'eau lagonaire à l'aide des produits Sentinel-2
Provedor de dados: 5
Autores: Rintz, Cam Ly.
The lagoon of New Caledonia is subject to various pressures, including terrigenous stream inputs. Their evolution – extent, intensity – can be studied through parameters such as ocean color, depending on turbidity or phytoplankton concentration. Satellite imagery is more and more used for this purpose. As the Sentinel-2 (S2) mission, with its satellites providing ten meters-resolution images, has been recently launched, we worked on the characterisation of lagoon color using these products. After testing the performance of existing algorithms for New Caledonia, initially applied to satellites other than S2, we tried to establish a new turbidity algorithm based on field data (measures in the South-West lagoon of New Caledonia and the lagoon near Koumac in...
Tipo: Text
Palavras-chave: Couleur de l’eau; Turbidité; Satellite; Télédétection; Réflectance; Lagon; Nouvelle-Calédonie; Sentinel-2.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00645/75752/76712.pdf

HYSCORES : Cartographies hyperspectrales appliquées aux écosystèmes coralliens et à leur état de santé.
Provedor de dados: 5
Autores: Ropert, Michel; Mouquet, Pascal; Bajjouk, Touria; Delacourt, Christophe.
En 2013, les résultats des travaux menés dans le cadre des projets "Spectrhabent-OI" (2009-2012), étendus au projet "Bioindication" (2012-2013) ont permis d'illustrer le potentiel important représenté par les nouvelles techniques d'imagerie aérienne hyperspectrale appliquées sur les plateformes récifales de l'île de La Réunion. L'objectif principal du projet HYSCORES (2015-2016) est de consolider ces premiers résultats dans une perspective de mise en œuvre opérationnelle de ces nouvelles méthodes dans le cadre de la DCE (directive-cadre européenne sur l’eau (2000/60/CE)). Pour cela 3 axes de recherche sont proposés : 1) l’étude et l'évaluation de la pertinence de l'indicateur VCH (vitalité corallienne hyperspectrale) proposé en 2012 ; 2) la capacité de...
Tipo: Text
Palavras-chave: Océan Indien; La Réunion; Récifs coralliens; Télédétection; Hyperspectral; Imagerie; Cartographie; Indicateur; Vitalité corallienne; Recouvrements; Algue; Corail; Sable; Herbier.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00350/46122/45820.pdf

Étude par télédétection de la dispersion en mer des eaux estuariennes issues de la Gironde et du Pertuis de Maumusson
Provedor de dados: 5
Autores: Castaing, P; Allen, Gp; Houdart, Michel; Moign, Y.
The objective of this study, carried out in the Gironde estuary inlet, was to determine the nature of the seaward dispersion of estuarine water and suspended sediments during a spring tide and high river flow. On June 3, 19(7, three flights were made over the inlet, at mid ebb, low tide and mid flood. The planned flight at high tide was cancelled due to adverse meteorological conditions. During each flight, thermal infrared coverage was obtained, together with black and white photographs. These data were correlated with concomitant ground mesures of current velocity, salinity, temperature and suspended sediment concentration Four types of water masses were identified during the tidal cycle: estuarine "very warm and turbid" water; estuarine "cooler and...
Tipo: Text
Palavras-chave: Hydrodynamique; Suspensions; Télédétection; Eaux côtières; Estuaire; Gironde; Hydrodynamic; Suspended sediments; Remote sensing; Coastal waters; Estuary; Gironde.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00122/23361/21188.pdf

Observer les coccolithophores de l'espace
Provedor de dados: 5
Autores: Perrot, Laurie.
Coccoliths, in cells or detached, from coccolithophores are calcite plates with highly backscattering signal.Coccolithophore blooms are visible from space and are currently quantified by Calcite algorithm fromNASA applied to Ocean Color data. Coccoliths impact also the Suspended Particulate Matters (SPM) product from Ifremer, well established in the Northwest european continental shelf. Although these algorithms are independent, they are based on the same basic concepts, but Ifremer algorithm is more adaptable and allows to link up with other particles than coccoliths, as the resuspended matters or aggregates.Coccolithophore blooms identification over 18 years, from bay of Biscay to South Irelands has been established by a spectral method, allowing to...
Tipo: Text
Palavras-chave: Matières en suspension; Télédétection; Golfe de Gascogne; Coccolithophores; Blooms; Suspended Particulate Matters; Remote-sensing; Bay of Biscay.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60914/64269.pdf

Télédétection des pollutions par hydrocarbures de l'"AMOCO CADIZ"
Provedor de dados: 5
Autores: Berne, Serge; Brossier, R.; Fontanel, A.; D'Ozouville, Laurent; Serriere, J.; Wadsworth, A.
At first, the chronology of remote sensing flights organized by CNEXO, IFP and IGN is summarized. Secondly, examples of the most commonly observed phenomena along the coastline are presented. An interpretation of the various data collected is given for the area of Roscoff, taken as a model. This interpretation is extended to draw a serie of maps of sea and coastline pollution for several days between March 18 to May 26, 1978. The maps for the 18th and 21st of March are enclosed.
Tipo: Text
Palavras-chave: Télédétection; Marée noire; Cartographie; Remote sensing; Oil spill; Cartography.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41716/40927.pdf

The airborne identification of oil films at the Caspian sea surface using CO2 lidar
Provedor de dados: 5
Autores: Osadchy, Vu; Shifrin, Ks; Gurevich, Iy.
Contrast in the reflectivity between pure and contaminated sea surfaces is the result of two effects, namely: (1) the different reflectivity of sea water and oil films on sea water, and (2) the damping effect by the oil film on the sea waves. The problem is to estimate the contribution of these two effects on the total contrast, so that the substance effect can be calculated. Magnitude is related to the oil film thickness. The spectral behaviour of the contrast and its relationship with the film thickness were calculated for an undisturbed sea surface. The estimate of the damping effect was made using the Cox and Munk's slope distributions for pure and contaminated surfaces. The method chosen was verified by a series of tests conducted over the Caspian Sea...
Tipo: Text
Palavras-chave: Hydrocarbure; Caractéristique optique; Pollution; Surface de la mer; Télédétection; Oil; Optical constant; Pollution; Sea surface; Remote sensing.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43628/43255.pdf

Dynamique des matières en suspensions minérales des eaux de surface de la Manche observée par satellite et modélisée numériquement.
Provedor de dados: 5
Autores: Rivier, Aurelie.
Study of mineral suspended particulate matter (SPM) is essential to understand ecosystem dynamics. SPM influences light penetration which is closely related to primary production and carries pollutants and nutrients within the water masses. This work aims to study near-surface mineral SPM dynamics in the English Channel using two complementary methods: remote-sensing by satellites and numerical modelling. Firstly, MODIS and MERIS satellite images processed by the IFREMER semi-analytical algorithm and describing non-algal SPM, are analysed to build three statistical models which are able to estimate near-surface SPM using simple variables, e.g., tidal coefficient, significant wave height and mean chlorophyll-a concentration. Secondly, the three-dimensional...
Tipo: Text
Palavras-chave: Matière en suspension; Télédétection; Satellite; Modélisation; Manche; Sédiments; Turbidité; Marée; Houle; Suspended particulate matter; Satellite; Remote-sensing; Modelling; English Channel; Sediments; Turbidity; Tide; Wave.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26783/24884.pdf

Chlorophyll profiles and the water column structure in the Gulf of California
Provedor de dados: 5
Autores: Hidalgo-gonzalez, Raquel M; Alvarez-borrego, Saul.
Remote sensors provide information on the photosynthetic pigment concentration for the upper 22% of the euphotic zone. To model primary production in the water column from satellite-derived photosynthetic pigments, estimates of the vertical distribution of pigment concentration are required. A Gaussian distribution function is used to represent the pigment vertical profile with four parameters. We used 268 chlorophyll concentration profiles from 1973 through 1993, to estimate these parameters. Cluster analysis of surface temperature was used to define the cool season as the period end of November-end of June, and the rest of the year is considered the warm season. Cluster analysis of surface temperature acid chlorophyll data grouped the stations into four...
Tipo: Text
Palavras-chave: Chlorophylle; Profil vertical; Golfe de Californie; Télédétection; Couche mélangée; Chlorophyll; Vertical profiles; Gulf of California; Remote sensing; Mixed layer.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43367/42848.pdf

Cartographie des faciès bio-sédimentaires du Bassin d’Arcachon à partir de l’imagerie FORMOSAT-2
Provedor de dados: 5
Autores: Lafon, Virginie; Marieu, Vincent; Butel, Rémi; Dehouck, Aurélie; Froidefond, Jean-marie; Trut, Gilles.
This study presents the first results of an ongoing research program that aims to derive thematic maps of the intertidal lagoon of Arcachon (SW Atlantic coast of France) from space imagery. At this stage, we present the results of the tests performed on Formosat-2 imagery. Several classification strategies have been tried with the aim to discriminate the sedimentary facies and the main species of the lagoon. The classes calculated by an optimized unsupervised clustering method, based on simulated annealing global minimization technique, were used to train a supervised classification algorithm. This approach allowed us to derive a bio-sedimentary map which overall accuracy is about 84%. Also, this method has the advantage of describing the fraction of...
Tipo: Text
Palavras-chave: Télédétection; Cartographie; Littoral; Classification optimisée; Recuit simulé.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00254/36572/35110.pdf

Cartographie des biocénoses marines de Guadeloupe à partir de données SPOT (récifs coralliens, phanérogames marines, mangroves)
Provedor de dados: 5
Autores: Chauvaud, S; Bouchon, C; Maniere, R.
In the framework of a comprehensive study of the coastal marine ecosystems of Guadeloupe Island (French West Indies), a remote sensing survey of marine communities was conducted in the Bay of the Grand Cul-de-Sac Marin. Pictures of SPOT satellite were used. At first sight, XS data from SPOT did not seem to be well adapted to extract information from deepest underwater areas. In the present study, a method for analysis of XS data was developed, which increases tenuous spectral differences associated to very low intensity signals. This technique led to a better distinction of objects, even the deepest ones. Reference surfaces were then identified in the field and a reliable supervised classification was conducted, which reflected the high diversity of...
Tipo: Text
Palavras-chave: Télédétection; Cartographie; Récif corallien; Phanérogame marine; Mangrove; Remote sensing; Mapping; Coral reef; Seagrass; Mangrove.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00291/40267/38646.pdf

The straits of Gibraltar and Kara Gates: a comparison of internal tides
Provedor de dados: 5
Autores: Morozov, Eg; Parrilla-barrera, G; Velarde, Mg; Scherbinin, Ad.
Moored current measurements, numerical model calculations, and satellite images from the straits of Gibraltar and Kara Gates are compared. The vertical internal displacements (double amplitudes) with a semidiurnal frequency are extremely large in both straits. The displacements are related to internal tidal waves over the sills. The energy of the internal tides is transferred to an internal bore and associated wave packets of short-period internal waves. Their surface manifestation can be seen on the satellite images. Numerical modeling shows that the outflowing current from the Mediterranean Sea to the Atlantic Ocean has a significant influence on internal tides. In the Kara Gates, the flow from the Barents Sea to Kara Sea has a similar influence. The...
Tipo: Text
Palavras-chave: Marée interne; Télédétection; Détroit de Gibraltar; Mer de Kara; Internal tide; Remote sensing; Strait of Gibraltar; Kara Sea.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43269/43000.pdf

Evaluation of large-scale unsupervised classification of New Caledonia reef ecosystems using Landsat 7 ETM+ imagery
Provedor de dados: 5
Autores: Bouvet, G; Ferraris, J; Andrefouet, S.
The capacity of the Landsat 7 Enhanced Thematic Mapper Plus sensor to classify the shallow benthic ecosytems of New Caledonia (South Pacific) is tested using a novel unsupervised classification method. The classes are defined by using a set of multiple spectral decision rules based on the image spectral bands. A general model is applied to the entire Southwest lagoon (5500 km(2)) and tested on three representative sites: a section of the barrier reef, a cay reef flat rich in corals, and a cay reef flat rich in algae and seagrass beds. In the latter one, the classification results are compared with a locally optimized model, with aerial color photographs and extensive ground-truthed observations. Results show that a reconnaissance of the main benthic...
Tipo: Text
Palavras-chave: Télédétection; Modèle statistique; Indo-Pacifique; Herbier; Corail; Remote sensing; Statistical modeling; Indo-Pacific; Seagrass; Coral.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43273/43004.pdf

Étude de la dynamique du microphytobenthos des vasières intertidales aux latitudes tempérées : approche combinée modélisation couplée physique-biologie et analyse de données satellitales
Provedor de dados: 5
Autores: Savelli, Raphael.
The high primary production (PP) of intertidal mudflats at temperate latitudes is mostly supported by microphytobenthos (MPB), which support both benthic and pelagic food webs. In the present thesis, we use a physical-biological coupled model to investigate the spatial and temporal variability of MPB dynamics on a large temperate intertidal mudflat of the French Atlantic coast. The model explicitly simulates the MPB biomass and the grazer (Peringia ulvae) biomass and density. The outputs provide key findings on MPB dynamics. In winter-spring, optimal light and mud surface temperature (MST) conditions for MPB growth lead to a MPB spring bloom. Light is the most limiting driver over the year. However, a high MST limits the MPB growth 40% of the time during...
Tipo: Text
Palavras-chave: Microphytobenthos; Vasière intertidale; Production primaire; Modélisation physique-biologie; Télédétection; Microphytobenthos; Intertidal mudflat; Primary production; Physical-biological modelling; Remote sensing.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00692/80423/83559.pdf

Surface suspended matter off the Rhone river mouth from visible satellite imagery
Provedor de dados: 5
Autores: Forget, P; Ouillon, S.
The quantification of surface Total Suspended Matter (TSM) off the Rhone river mouth is investigated using SPOT-XS and Landsat-TM images collected in November 1994. The method of satellite data calibration from in situ measurements is discussed. It is based on TSM concentration measurements through filtration of surface water samples and on radiometric data collected with a 256-channel spectroradiometer in the range 400-1100 nm. Empirical relationships between reflectance and TSM concentration are established by linear regression analysis of the data. These relationships are then applied to the image data corrected from atmospheric and surface effects. A good agreement, within a factor of less than two, was found on derived TSM concentration values as...
Tipo: Text
Palavras-chave: Réflectance; Matière en suspension; Télédétection; Panache fluvial; Rhône; Reflectance; Suspended matter; Remote sensing; River plume; Rhone river.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43637/43228.pdf

A comparison between sea-surface temperature-measurements from satellite noaa4 and from airborne radiometer aries
Provedor de dados: 5
Autores: Albuisson, M; Pontier, L; Wald, L.
Measurements of sea surface temperatures (Sst) in the Gulf of Lions, obtained by the satellite "Noaa 4" sensor Vhrr and by the airborne radiometer "Aries", are presented and compared. The results reveal the reliability of the Vhrr data in the range 16-20. SOC, the degree of accuracy being within O. 5°C of the relative temperatures, despite a malfunctionning of the "Noaa 4" Vhrr.
Tipo: Text
Palavras-chave: Températures de surface; Télédétection; Sea surface temperatures; Remote sensing.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00323/43432/43082.pdf

Estimation des stocks conchylicoles par télédection: résulats et perspectives
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Populus, Jacques; L'Herroux, Michel; Brussieux, Marc.
This papers compares modern techniques of remote sensing (numerical) to more classical ones (photo-interpretation) for the assessment of the intertidal zone land use. The study is limited to homogeneous areas of off-bottom cultivation.  The evaluation of the total area was made using both middle scale aerial photographs, with systematic sampling, and SPOT satellite data. These two methods do not allow to measure the off-bottom rearing design length. It is therefore necessary to get more precise information through high resolution data such as classical high scale photographs numerical scanners (MATRA) or C.C.D. cameras.
Tipo: Text
Palavras-chave: Télédétection; Conchyliculture; Estimation stocks.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-2959.pdf

Coastal zones inventory by high resolution satellites
Provedor de dados: 5
Autores: Loubersac, Lionel.
The development of tools for assessing impacts on coastal environments is a reality. These impact assessments need both baseline and monitoring studies. Satellite remote sensing data would be useful for coastal inventories (baselines) and monitoring if high spatial and temporal resolutions are yield compatible. An overview of the various sensors that could be used is presented. The constraints linked to the different resolutions are exposed. An example based on Spot simulated data and trends are developed.
Tipo: Text
Palavras-chave: Milieu littoral; Télédétection; Méthode satellite; Haute résolution; Surveillance; Cartographie; Analyse composante principale; Simulation; Zone côtière; SPOT; Coastal environment; Remote sensing; Satellite methods; High-resolution methods; Monitoring; Cartography; Principal components analysis; Simulation.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00143/25379/23517.pdf

Refroidissements locaux aux abords du talus continental Armoricain
Provedor de dados: 5
Autores: Langlois, Gilbert; Gohin, Francis; Serpette, Alain.
Infrared measurement at the sea surface, which constitutes an operational technology in remote-sensing, has become essential for the study of ocean dynamics. Nevertheless, observations are only usable when clouds do not mask infrared radiation coming from the ocean, a condition which rarely pertains in the Bay of Biscay as a whole. lt is consequently a matter of primary concern to have at one's disposai an effective method which permits the computation of mean SST fields from a chronological succession of incomplete images. In the case under consideration, "kriging" is the most widely practised method of performing geostatistical estimates. Before mapping isotherms, temperatures are estimated by interpolation on a regular gridnet. The process was applied...
Tipo: Text
Palavras-chave: Ondes internes; Talus continental; Température superficielle; Télédétection; Analyse objective; Internal waves; Continental shelf; Sea-surface temperature; Teledetection; Objective analysis.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00131/24236/22229.pdf

Assessment of tropical shrimp aquaculture impact on the environment in tropical countries, using hydrobiology, ecology and remote sensing as helping tools for diagnosis
Provedor de dados: 5
Autores: Fuchs, Jacques; Martin, Jean-louis M.; Populus, Jacques.
After a period of rapid development of the sites (an increase in both reared surface area and production), tropical shrimp aquaculture is currently being faced with critical problems due to economical and ecological constraints. In many countries with favourable conditions for shrimp aquaculture such as indonesia or Vietnam, sites are often badly selected and/or over-exploited. This conducts to sorne extent to decreases or collapses in the production due to the difficulty in predicting the maximum production capacity of the sites. Furthermore, it appears that production sustainability depends on many factors among which socio-economy and ecolo gy are of prime importance. The STD3 project titled « Assessment of tropical shrimp aquaculture impact on the...
Tipo: Text
Palavras-chave: Interaction aquaculture - environnement; Aquaculture crevettes; Critères écologiques et socio-économiques; Sélection de sites; Suivi du développement; Télédétection; SIG; Impact assessment; Coastal environment; Shrimp culture; Biological and socio-economic criteria; Site selection; Remote sensing; GIS.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00132/24357/22357.pdf

Développement durable de l’aquaculture dans le delta du Mékong : Quelle place pour la télédétection dans le projet pluridisciplinaire GAMBAS de la Communauté Européenne ?
Provedor de dados: 5
Autores: Auda, Yves; Populus, Jacques; Blasco, F.
GAMBAS est un programme de la Commission Européenne de recherche sur le développement durable de l'aquaculture dans le delta du Mékong. La pluridisciplinarité des équipes impliquées dans ce programme a permis de cerner précisément l'impact de l'aquaculture sur l'écosystème « mangrove ». Dans cette action, la télédétection a joué un rôle fédérateur des connaissances acquises au cours des quatre années de collaboration franco-vietnamienne (2001-2004). Les données botanique, d 'écologie aquatique et de socio-économie collectées dans une quarantaine de stations réparties dans deux provinces (Camau et TraVinh) sont analysées conjointement grâce au lien spatial assuré par la télédétection. Plus précisément, une zonation écologique, un indice de confinement ...,...
Tipo: Text
Palavras-chave: Mangrove; Télédétection; Mékong(Vietnam).
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00197/30863/29231.pdf

Seasonal and interannual changes in Intense Benguela Upwelling (1982-1999)
Provedor de dados: 5
Autores: Hagen, E; Feistel, R; Agenbag, Jj; Ohde, T.
Monthly maps of remotely sensed sea surface temperatures derived from NOAA/AVHRR thermal images are used to describe changes in 'Intense Benguela Upwelling' during 1982-1999. The coastal area under investigation lies between 9-34degrees S and 8-20degrees E and the total area of cold water between the coast and the course of the 13 degreesC isotherm is considered to be an index of intense, active upwelling. It exhibits a decreasing trend over the study period of 18 years and some evidence for a quasi-cycle of about 27 months. Seasonal cycles are discussed for the total cold water area as well as for its mean alongshore and offshore extents. The main season of cold surface water was found to occur between July and September during the austral winter. It...
Tipo: Text
Palavras-chave: Courant de Benguela; Upwelling côtier; Télédétection; Température de surface de la mer; Niño de Benguela; Benguela Current; Coastal upwelling; Remote sensing; Sea surface temperature; Benguela Nino.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43332/42895.pdf

Variabilité du panache turbide de la Gironde par télédétection. Effets des facteurs climatiques
Provedor de dados: 5
Autores: Froidefond, Jm; Jegou, Anne-marie; Hermida, J; Lazure, Pascal; Castaing, P.
The Gironde estuary (France) discharges to the ocean an important amount of suspended particulate matter in the form of turbid plumes. The surface plume is more particularly studied from coastal oceanographic surveys and NOAA/AVHRR satellite data collected during a French programme of coastal oceanography (PNOC-Atlantic). The AVHRR reflectances are atmospherically corrected according to an algorithm based on the clear water concept. The comparison with suspended sediment concentrations are realised by direct and indirect calibrations. The correlations obtained show that at a same concentration the reflectance varies, probably because of varying particle (floc) size and composition. The shape and the surface measured from low resolution (4 km x 4 km) and...
Tipo: Text
Palavras-chave: Panache turbide; Télédétection; Hydrologie; Climatologie; Gironde; Turbid plume; Remote sensing; Hydrology; Climatology; Gironde.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-848.pdf

Un bilan de la télédétection appliquée aux milieux coralliens
Provedor de dados: 5
Autores: Andrefouet, Serge; Maritorena, Stéphane; Loubersac, Lionel.
The aim of this paper is to present in a practical fashion the status of the use of remote sensing for the study of coral reef environments through the analysis of work published in the years 1980-2000. We review the scales of the potential work and of that actually conducted, the principal applications and their limiting factors. We detail these limitations which are of a technological nature (spatial and spectral resolution of sensors), as well as often of a conceptual (role of remote sensing in the study) or methodological (image processing) nature. The understanding of these limitations, in relation to the reality of the field, allows identification of work which could be undertaken in the years 2000.
Tipo: Text
Palavras-chave: Télédétection; Récifs coralliens; Cartographie; Bathymétrie; Classification; Segmentation; Remote sensing; Coral reefs; Mapping; Bathymetry; Classification; Segmentation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00089/20044/17685.pdf

L'algue japonaise Sargassum muticum (Yendo) fensholt. Caractéristiques et répartition
Provedor de dados: 5
Autores: Loraine, Isabelle.
Sargassum muticum is a Japanese alga from the pheophycee class which has been introduced in Europe about fifteen years ago. It has greatly developed on account of its intrinsic characteristics (adaptation, growth speed, reproduction mode, etc...) and the favorable conditions it has encountered. The nuisance it generates can be very high but no efficient fighting solution has been found yet. Only mechanical means can be considered on a one off basis in areas where eradication is indispensable. Any development is faced with the problem of pick up costs. However the most interesting development for Sargassum muticum would be to utilize it as flocculent for suspended organic substances.  Location updates for Sargassum muticum in France in 1989 did not show any...
Tipo: Text
Palavras-chave: Teledetection; Seaweed; Sargassum muticum; Télédétection; Algue; Sargassum muticum.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-1656.pdf

Ligurian sea - annual variation of the sea-surface thermal structure as detected by satellite noaa-5
Provedor de dados: 5
Autores: Wald, L; Nihous, G.
Examination of one hundred thermographies of the Ligurian Sea, obtained during the years 1975, 1977, 1978 and 1979 by the satellite NOAA 5, reveals the quasi-permanence, over a year, of a me an superfIcial cyclonic circulatiçm, generally characterized by its thermal pattern. The large number of satellite images and the use of specifIc methods permit the description of the an nuai variations in the structure of the horizontal thermal gradients. Results are in close agreement with those provided by previous authors.
Tipo: Text
Palavras-chave: Télédétection; Température de surface; Mer Ligure; Remote sensing; Sea-surface temperature; Ligurian Sea.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00323/43429/43085.pdf

Etude de l'impact des icebergs Antarctiques sur l'Océan Austral
Provedor de dados: 5
Autores: Bouhier, Nicolas.
The Antarctic polar ice cap constrains a freshwater flaux into the Austral Ocean through two equally important pathways : a localized and immediate injection through the melting of ice-shelves bases, and a delayed offshore injection through the calving and subsequent melt of icebergs. Some studies reckon that melting icebergs have the capacity to alter the hydrological and biogeo-chemical characteristics of the water column. The numerical models trying to evaluate this impact have shown contrasting results. Yet, they might suffer from a poor representation of the icebergs, namely due to our limited knowledge on both the spatial and size distributions of the icebergs, or even the processes involved in their mass loss. A new method using satellite altimetry...
Tipo: Text
Palavras-chave: Ntarctique; Calotte polaire; Plate-forme glaciaire; Océan austral; Flux d’eau douce; Télédétection; Banquise; Fonte; Fracturation; Distribution de taille; Antarctica; Ice cap; Ice shelf; Southern Ocean; Iceberg; Freshwater flux; Remote sensing; Sea ice; Melting; Fragmentation; Fracturing; Size distribution.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60905/64253.pdf

Determining ridge and runnel longshore migration rate using Spot imagery
Provedor de dados: 5
Autores: Lafon, V; Dupuis, H; Howa, H; Froidefond, Jm.
High-resolution colour satellite imagery is used to map the morphology and to determine the longshore movements of intertidal ridge and runnel systems that characterise the Atlantic southwest coast of France. A couple of Spot images recorded during the summer of 1989 are processed to extract accurate geographical maps of the coastline defined. in this study, as the level corresponding to the lowest astronomical tide. The coastline extraction method is based on a reflectance model, providing depth measurements that were calibrated in the field. This method enables us to map the coastline regardless of the tide level above the lowest astronomical tide at the moment of the image capture. As this model can be extrapolated to a large area, hen sea water is...
Tipo: Text
Palavras-chave: Télédétection; Couleur de l’océan; Trait de côte; Déplacement des barres littorales; Côte aquitaine; Remote sensing; Ocean colour; Coastline; Ridge and runnel movement; Aquitaine coast.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43316/42938.pdf