Auswahl der wissenschaftlichen Literatur zum Thema „Écosystèmes – Télédétection“
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Zeitschriftenartikel zum Thema "Écosystèmes – Télédétection"
Beaudoin, Laurent, Antoine Gademer, Loïca Avanthey, Bernard Riera und Jean-Paul Rudant. „Faucon noir: retour d'expérience sur une étude de la biodiversité par drone“. Revue Française de Photogrammétrie et de Télédétection, Nr. 213 (26.04.2017): 11–18. http://dx.doi.org/10.52638/rfpt.2017.189.
Der volle Inhalt der QuelleAdeline, Karine R. M., Arnaud Le Bris, Fabien Coubard, Xavier Briottet, Nicolas Paparoditis, Françoise Viallefond, Nicolas Rivière et al. „Description de la campagne aéroportée UMBRA : étude de l'impact anthropique sur les écosystèmes urbains et naturels avec des images THR multispectrales et hyperspectrales“. Revue Française de Photogrammétrie et de Télédétection, Nr. 202 (16.04.2014): 79–92. http://dx.doi.org/10.52638/rfpt.2013.53.
Der volle Inhalt der QuelleChabi, Adéyèmi, Joseph Oloukoi, Vincent Joseph Mama und Paul Kiepe. „Inventaire par télédétection des agro-écosystèmes de bas-fonds dans le centre du Bénin*“. Cahiers Agricultures 19, Nr. 6 (November 2010): 446–53. http://dx.doi.org/10.1684/agr.2010.0434.
Der volle Inhalt der QuelleDechaïcha, Assoule, und Djamel Alkama. „DÉTECTION DU CHANGEMENT DE L’ÉTALEMENT URBAIN AU BAS-SAHARA ALGÉRIEN : APPORT DE LA TÉLÉDÉTECTION SPATIALE ET DES SIG. CAS DE LA VILLE DE BISKRA (ALGÉRIE)“. Revue Française de Photogrammétrie et de Télédétection, Nr. 222 (26.11.2020): 43–51. http://dx.doi.org/10.52638/rfpt.2020.486.
Der volle Inhalt der QuelleAkodewou, Amah, Johan Oszwald, Sêmihinva Akpavi, Laurent Gazull, Koffi Akpagana und Valéry Gond. „Problématique des plantes envahissantes au sud du Togo (Afrique de l’Ouest): apport de l’analyse systémique paysagère et de la télédétection“. BASE, Nr. 2 (2019): 88–103. http://dx.doi.org/10.25518/1780-4507.17750.
Der volle Inhalt der QuelleGROSS, L., M. L. BORSA und L. DEIRMENDJIAN. „Télédétection des cyanobactéries dans les bassins de rétention d’eaux pluviales de Saint-Quentin-en-Yvelines“. Techniques Sciences Méthodes 11 (21.11.2022): 53–60. http://dx.doi.org/10.36904/tsm/202211053.
Der volle Inhalt der QuelleBourbier, Lucas, Guillaume Cornu, Alexandre Pennec, Christine Brognoli und Valéry Gond. „Estimation à grande échelle de l'ouverture du couvert forestier en Afrique centrale à l'aide de données de télédétection“. BOIS & FORETS DES TROPIQUES 315, Nr. 315 (01.03.2013): 3. http://dx.doi.org/10.19182/bft2013.315.a20537.
Der volle Inhalt der QuelleSiradji, Abdoulaye Abdou, Inoussa Maman Maarouhi, Mansour Mahamane, Assoumane Guero Ousseini, Hamani Noma Abdoul Latif, Douma Soumana, Bakasso Yacoubou und Mahamane Ali. „Dynamique spatio-temporelle des écosystèmes de la Réserve de Biosphère de Gadabédji dans la zone Nord Sahélienne au centre du Niger“. European Scientific Journal, ESJ 20, Nr. 18 (30.06.2024): 310. http://dx.doi.org/10.19044/esj.2024.v20n18p310.
Der volle Inhalt der QuelleSambiani, Danbenoa. „Cartographie et caractérisation écologique des formations végétales à épineux du socle Eburnéen au Togo“. Revue Ecosystèmes et Paysages 3, Nr. 2 (30.12.2023): 1–11. http://dx.doi.org/10.59384/recopays.tg3218.
Der volle Inhalt der QuelleChekchaki, Samir, Arifa Beddiar und Mohamed Djalil Zaafour. „Cartographie par télédétection des milieux envahis par Acacia mearnsii De Wild. dans l’extrême Nord-Est algérien“. BOIS & FORETS DES TROPIQUES 343 (14.01.2020): 5–16. http://dx.doi.org/10.19182/bft2020.343.a31835.
Der volle Inhalt der QuelleDissertationen zum Thema "Écosystèmes – Télédétection"
Touré, Ibra. „Contribution à l'analyse et à la cartographie de divers écosystèmes sahéliens par l'utilisation de la télédétection et des systèmes d'informations géographiques“. Nice, 1994. http://www.theses.fr/1994NICE2018.
Der volle Inhalt der QuelleThe Sahel is manifestly the only geographical zone where all efforts aimed at harnessing and managing natural resources are hindered by the insufficiency, or more commonly. The lack, of reliable cartographie data. Moreover. Trational maps on paper increasingly fail to meet the meeds of spatial analysis and aid in planning. This thesis focusses ont the analysis of sahelian ecosystems, and employs a methodological design, based on new techniques of digital cartography, that combines remote data from satellites and geographical information systems. Part one of the thesis outlines the major geographical features of the Sahel zone. Emphasis is placed on the eco-climatic factors and their impact on specitfic ecosystems that are fairly representative of this zone - the "brousse tigrée" of the Tagant-Mauritania area, the Senegal valley and the mangroves of the Saloum river in Senegal. The principles and methods of remote sensing are also recalled, as well as the advantages of sattellite images in the monitoring and analysis of sensitive and poorly known environements. Part two deals with the synergy between remote sensing and geographical information systems. The advantages of each of these two techniques are highilighted, and the study proposes an integration methodology geared towards a better cartographic approach to dynamic ecosystems. Part three demonstrates the efficiency of a geographical information system incorporating satellite images. This procedure is illustrated with reference to the mangroves of the Saloum river mouth. The study finally proposes a series of recommendations and propositions that serve a framework for the transfer and application of these new techniques in the countries composing the Sahel
Kristóf, Dániel. „Application de la télédétection pour la cartographie et le suivi des écosystèmes forestiers : application à la forêt hongroise“. Toulouse 3, 2005. http://www.theses.fr/2005TOU30233.
Der volle Inhalt der QuelleMonitoring subtle changes over long time periods using numerous satellite images is a challenging task. In this thesis, possibilities and limitations of the available data and methods are presented through three case studies. In the first one, the objective is to create a digital vegetation map by using a multispectral satellite image. In the second study, forestry applications of novel very high resolution satellite images are examined. Geometric correction and special data extraction methods are of interest. The third case study aims at the quantification of the effects of a water diversion on local forested ecosystems in the north-western part of Hungary. Numerous satellite images are used to carry out quantitative change analysis. The long study period, the large number of images and the objectives of the study require the application and testing of several methods, and the elaboration of new methods, especially for geometric and radiometric corrections and data fusion
Bellet, Valentine. „Intelligence artificielle appliquée aux séries temporelles d'images satellites pour la surveillance des écosystèmes“. Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES013.
Der volle Inhalt der QuelleIn the context of climate change, ecosystem monitoring is a crucial task. It allows to better understand the changes that affect them and also enables decision-making to preserve them for current and future generations. Land use and land cover (LULC) maps are an essential tool in ecosystem monitoring providing information on different types of physical cover of the Earth's surface (e.g. forests, grasslands, croplands). Nowadays, an increasing number of satellite missions generate huge amounts of free and open data. In particular, satellite image time series (SITS), such as the ones produced by Sentinel-2, offer high temporal, spectral and spatial resolutions and provide relevant information about vegetation dynamics. Combined with machine learning algorithms, they allow the production of frequent and accurate LULC maps. This thesis is focused on the development of pixel-based supervised classification algorithms for the production of LULC maps at large scale. Four main challenges arise in an operational context. Firstly, unprecedented amounts of data are available and the algorithms need to be adapted accordingly. Secondly, with the improvement in spatial, spectral and temporal resolutions, the algorithms should be able to take into account correlations between the spectro-temporal features to extract meaningful representations for the purpose of classification. Thirdly, in wide geographical coverage, the problem of non-stationarity of the data arises, therefore the algorithms should be able to take into account this spatial variability. Fourthly, because of the different satellite orbits or meteorological conditions, the acquisition times are irregular and unaligned between pixels, thus, the algorithms should be able to work with irregular and unaligned SITS. This work has been divided into two main parts. The first PhD contribution is the development of stochastic variational Gaussian Processes (SVGP) on massive data sets. The proposed Gaussian Processes (GP) model can be trained with millions of samples, compared to few thousands for traditional GP methods. The spatial and spectro-temporal structure of the data is taken into account thanks to the inclusion of the spatial information in bespoke composite covariance functions. Besides, this development enables to take into account the spatial information and thus to be robust to the spatial variability of the data. However, the time series are linearly resampled independently from the classification. Therefore, the second PhD contribution is the development of an end-to-end learning by combining a time and space informed kernel interpolator with the previous SVGP classifier. The interpolator embeds irregular and unaligned SITS onto a fixed and reduced size latent representation. The obtained latent representation is given to the SVGP classifier and all the parameters are jointly optimized w.r.t. the classification task. Experiments were run with Sentinel-2 SITS of the full year 2018 over an area of 200 000 km^2 (about 2 billion pixels) in the south of France (27 MGRS tiles), which is representative of an operational setting. Results show that both methods (i.e. SVGP classifier with linearly interpolated time series and the spatially kernel interpolator combined with the SVGP classifier) outperform the method used for current operational systems (i.e. Random Forest with linearly interpolated time series using spatial stratification)
Thiam, Sidy. „Suivi des écosystèmes sahéliens à partir de la télédétection satellitaire : application au delta intérieur du Niger (Mali) et à la région du lac de Guiers (Sénégal)“. Paris 1, 1997. http://www.theses.fr/1997PA010696.
Der volle Inhalt der QuelleCadamuro, Laurent. „Structure et Dynamique des écosystèmes inondables (forêt marécageuse, mangrove) du bassin du Sinnamary (Guyane Française)“. Phd thesis, Université Paul Sabatier - Toulouse III, 1999. http://tel.archives-ouvertes.fr/tel-00007798.
Der volle Inhalt der QuelleKaptue, Tchuente Armel. „Cartographie des écosystèmes et paramètres biophysiques satellitaires pour l'étude des flux hydriques sur le continent africain“. Toulouse 3, 2010. http://thesesups.ups-tlse.fr/994/.
Der volle Inhalt der QuelleIn the context of climate change, the aim of this study is to characterize the heterogeneity of the African continent in order to provide some elements to better understand and quantify surfaces process acting on hydric fluxes. This work is intented to update the double ECOCLIMAP-I database which is constituted by a land cover map and a dassets of land biophysical parameters. To this end, we use remotely sensed data acquired by the latest generation sensors MODIS and SPOT/VEGETATION between 2000 and 2007. During the first step, two methods of classifications has been developed for the mapping of different ecosystems. The first method, which is supervised, is obtained by combining information provided by the both global land cover map GLC2000 and ECOCLIMAP-I using an interactive analysis of MODIS leaf area index (LAI). It has been performed in the framework of the AMMA project to discriminate ecosystems over the western African Region. The second method is hybrid in that it combines k-NN clustering, hierarchical principles and the Fast Fourier Transform (FFT) on the basis of multi-annual NDVI data from SPOT/VEGETATION to identify ecosystems at the whole African continent. Then, methods for the estimation of land surface biophysical variables such as albedo, fractional vegetation cover and leaf area index has been developed and/or applied over the mainland. A statistical approach allows us to determine the contribution of bare soil albedo and vegetation albedo to the constitution of albedo as required in land surface models. After the application of the latter approach over the western african region, we demonstrate the robustness of the method by applying it over the entire mainland. The sensitivity of two land surface scenarios was studied by analysing two simulations with the same atmospheric forcing over the western African Region:one using the ECOCLIMAP-I classification and another using the new physiographic forcing specifically developed over the western African region. Heat and latent flux are mainly driven by the fractional vegetation coverage. The land surface model ISBA can be used to predict the impact of land cover change and accordingly the anthropic pressure on hydric fluxes
Amram, Olivier. „Régionalisation du bilan hydrique à l'aide de mesures satellitaires pour l'étude du fonctionnement des écosystèmes d'Afrique de l'Ouest“. Toulouse 3, 1996. http://www.theses.fr/1996TOU30274.
Der volle Inhalt der QuelleEspel, Diane. „Développement d'une boîte à outils pour comprendre et prédire la dynamique spatiale et temporelle des macrophytes submergés : application aux écosystèmes fluviaux“. Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0083.
Der volle Inhalt der QuelleBecause of their multiple ecological roles, macrophytes are an important component of hydrosystems, and are thus essential to conserve. However, during the summer season, high densities of submerged species cause recurrent problems in certain rivers, especially in urban areas for users and managers, and can have negative consequences for ecosystem health. In a context of global change, the overgrowth of submerged macrophytes calls for new tools to better understand the dynamics of macrophytes meadows and to predict their dynamics according to different environmental scenarios. In this context, this thesis aims to develop a toolbox accompanying a multispecific mechanistic model for the production of submerged aquatic plants, the DEMETHER model. This model simulates the spatial and temporal biomass dynamics for two common species of the mid-part of the Garonne (Myriophyllum spicatum and Ranunculus fluitans) over river section of about one kilometer. It takes into account the variability of local hydromorphological and meteorological conditions. To do this, the model requires determining certain ecophysiological parameters and having spatialized biomass data for its calibration, as well as bathymetric and substrate data. The first phase of this work then consisted in field surveys to characterize the study site and in developing numerical or experimental tools for the acquisition of these data. The first tool developed aims to monitor submerged macrophytes by remote sensing. The method explored here confirmed the potential of high spatial resolution (50 cm) multispectral imagery of Pléiades satellites, processed by machine learning algorithms, to map the distribution of macrophyte beds and quantify their biomass in situ. This approach has also led us to propose an optimized sampling strategy for macrophytes in large rivers for future investigations. This work opens up interesting perspectives for applying the method to drone imagery, and continuing its development for automated monthly monitoring. In parallel, a tool was developed for measuring physiological parameters via oximetry and applied to the two species of interest. The data obtained provide information in particular on the photosynthetic and respiratory capacities of each species in response to limiting factors (light, temperature). The second phase of this work consisted in applying the DEMETHER model to explore different climate change scenarios. Simulations of the macrophyte dynamics in terms of biomass were carried out for current thermal conditions and for a foreseeable rise in temperatures by 2041-2070. The results showed the importance of the temperature sensitivity of certain physiological processes to explain the distribution patterns of the two species studied, highlighting the interest of mechanistic modelling to understand the structuring of macrophyte communities. The first results obtained with this toolbox confirmed its functionality. However, in order to extend its application range, each of the tools developed during the thesis will need to be further improved, in particular to refine the calibration of the DEMETHER model. Specific suggestions have been made to this aim
Kone, Nicolas. „Contribution à l'étude du fonctionnement des écosystèmes naturels en zone soudano-sahélienne (cas du Burkina Faso). Approche de la dynamique de la sécheresse par télédétection“. Toulouse 3, 1992. http://www.theses.fr/1992TOU30067.
Der volle Inhalt der QuelleJauffret, Sandrine. „Validation et comparaison de divers indicateurs des changements à long term dans les écosystèmes méditerranéens arides : application au suivi de la désertification dans le Sud tunisien“. Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30066.
Der volle Inhalt der QuelleAs many rangelands surrounding the Mediterranean Basin, the Tunisian arid zone, characterised by scattered steppic vegetation, is commonly viewed as degraded landscapes. In Arid Mediterranean regions, vegetation dynamics is indeed affected by hunian and non-human disturbances and stresses which induce desertification processes. In this context, the objectives of this research were to identify and validate various indicators of long term changes to provide information useful for the management of arid lands. The study is focussed on the understanding of 1) the structure and functioning of ecosystems and 2) the changes that occur in space and time in response to degradation. The ecological indicators allow us to describe different organisation levels from species to the ecosystem and the landscape. The diachronic comparison of vegetation maps of 1975 and 2000 allow a more complete diagnosis about the evolution of ecosystems and landscapes over the last three decades. .
Bücher zum Thema "Écosystèmes – Télédétection"
Alaric, Sample V., und American Forests (Association). Forest Policy Center., Hrsg. Remote sensing and GIS in ecosystem management. Washington, D.C: Island Press, 1994.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Sciences de l'activité physique pse4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Technologie de l'information en affaires btx4e cours préemploi. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Études informatiques ics4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Mathématiques de la technologie au collège mct4c cours précollégial. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Sciences snc4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: English eae4e cours préemploi. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Le Canada et le monde: une analyse géographique cgw4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Environnement et gestion des ressources cgr4e cours préemploi. Vanier, Ont: CFORP, 2002.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Histoire de l'Occident et du monde chy4c cours précollégial. Vanier, Ont: CFORP, 2002.
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