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L'image aérienne proche infrarouge : une information essentielle pour l'étude et la cartographie de la végétation / Jean Guy Boureau in Rendez-vous techniques, n° 31 (hiver 2011)
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Titre : L'image aérienne proche infrarouge : une information essentielle pour l'étude et la cartographie de la végétation Type de document : Article/Communication Auteurs : Jean Guy Boureau , Auteur
Année de publication : 2011 Article en page(s) : pp 32 - 38 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Photo-interprétation
[Termes IGN] image aérienne
[Termes IGN] image thermique
[Termes IGN] phénologie
[Termes IGN] rayonnement proche infrarouge
[Termes IGN] reconnaissance de formes
[Termes IGN] réflectance végétale
[Termes IGN] réponse spectraleRésumé : (auteur) Dès sa création, l’IFN eut recours aux images aériennes infrarouges comme support pour asseoir ses unités d’échantillonnage. À partir des années 1980, celles-ci servirent également à la réalisation de la carte forestière. Mais qu’est-ce qu’une image aérienne proche infrarouge, quel est son intérêt pour l’étude de la végétation ? Quels sont les éléments à considérer lorsque l’on interprète une image de ce type ? Quelques éléments de réponse ont été rassemblés ici tant sur les caractéristiques des images que sur la méthode d’interprétation, laquelle requiert toutefois un minimum d’expérience. Numéro de notice : A2011-561 Affiliation des auteurs : IFN (1958-2011) Thématique : FORET/IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74957
in Rendez-vous techniques > n° 31 (hiver 2011) . - pp 32 - 38[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-P001247 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Documents numériques
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A2011-561 image aérienne proche infrarouge_BureauAdobe Acrobat PDFMonitoring elevation variations in leaf phenology of deciduous broadleaf forests from SPOT/VEGETATION time-series / Dominique Guyon in Remote sensing of environment, vol 115 n° 2 ([15/02/2011])
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Titre : Monitoring elevation variations in leaf phenology of deciduous broadleaf forests from SPOT/VEGETATION time-series Type de document : Article/Communication Auteurs : Dominique Guyon, Auteur ; Marie Guillot, Auteur ; Yann Vitasse, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 615 - 627 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] analyse des mélanges temporels
[Termes IGN] analyse diachronique
[Termes IGN] Fagus (genre)
[Termes IGN] feuillu
[Termes IGN] image SPOT-Végétation
[Termes IGN] indice de végétation
[Termes IGN] phénologie
[Termes IGN] Pyrénées (montagne)
[Termes IGN] Quercus (genre)
[Termes IGN] variation saisonnièreMots-clés libres : Phenology Leaf unfolding Deciduous forest Elevation VEGETATION Perpendicular vegetation index temporal unmixing Résumé : (auteur) In mountain forest ecosystems where elevation gradients are prominent, temperature gradient-based phenological variability can be high. However, there are few studies that assess the capability of remote sensing observations to monitor ecosystem phenology along elevation gradients, despite their relevance under climate change. We investigated the potential of medium resolution remotely sensed data to monitor the elevation variations in the seasonal dynamics of a temperate deciduous broadleaf forested ecosystem. Further, we explored the impact of elevation on the onset of spring leafing. This study was based on the analysis of multi-annual time-series of VEGETATION data acquired over the French Pyrenees Mountain Region (FPMR), in conjunction with simultaneous ground-based observations of leaf phenology made for two dominant tree species in the region (oak and beech). The seasonal variations in the perpendicular vegetation index (PVI) were analyzed during a five-year period (2002 to 2006). The five years of data were averaged into a one sole year in order to fill the numerous large spatio-temporal gaps due to cloud and snow presence – frequent in mountains – without altering the temporal resolution. Since a VEGETATION pixel (1 km²) includes several types of land cover, the broadleaf forest-specific seasonal dynamics of PVI was reconstructed pixel-by-pixel using a temporal unmixing method based on a non-parametric statistical approach. The spatial pattern of the seasonal response of PVI was clearly consistent with the relief. Nevertheless the elevational or geographic range of tree species, which differ in their phenology sensitivity to temperature, also has a significant impact on this pattern. The reduction in the growing season length with elevation was clearly observable from the delay in the increase of PVI in spring and from the advance of its decrease in the fall. The elevation variations in leaf flushing timing were estimated from the temporal change in PVI in spring over the study area. They were found to be consistent with those measured in situ (R2 > 0.95). It was deduced that, over FPMR, the mean delay of leaf flushing timing for every 100 m increase in elevation was estimated be approximately 2.3 days. The expected estimation error of satellite-based leaf unfolding date for a given elevation was approximately 2 days. This accuracy can be considered as satisfactory since it would allow us to detect changes in leafing timing of deciduous broadleaf forests with a magnitude equivalent to that due to an elevation variation of 100 m (2.3 days on average), or in other words, to that caused by a variation in the mean annual air temperature of 0.5 °C. Although averaging the VEGETATION data over five years led to a loss of interannual information, it was found to be a robust approach to characterise the elevation variations in spring leafing and its long-term trends. Numéro de notice : A2011-563 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2010.10.006 En ligne : https://doi.org/10.1016/j.rse.2010.10.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74834
in Remote sensing of environment > vol 115 n° 2 [15/02/2011] . - pp 615 - 627[article]Modelling forest management within a global vegetation model - Part 2: Model validation from a tree to a continental scale / V. Bellassen in Ecological modelling, vol 222 n° 1 (janvier 10, 2011)
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Titre : Modelling forest management within a global vegetation model - Part 2: Model validation from a tree to a continental scale Type de document : Article/Communication Auteurs : V. Bellassen, Auteur ; G. Le Maire, Auteur ; O. Guin, Auteur ; Jean-François Dhôte, Auteur ; Philippe Ciais, Auteur ; Nicolas Viovy, Auteur Année de publication : 2011 Article en page(s) : pp 57 - 75 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biomasse forestière
[Termes IGN] carbone
[Termes IGN] modélisation de la forêt
[Termes IGN] stress hydriqueMots-clés libres : ORCHIDEE-FM Résumé : (auteur) The construction of a new forest management module (FMM) within the ORCHIDEE global vegetation model (GVM) allows a realistic simulation of biomass changes during the life cycle of a forest, which makes many biomass datasets suitable as validation data for the coupled ORCHIDEE-FM GVM. This study uses three datasets to validate ORCHIDEE-FM at different temporal and spatial scales: permanent monitoring plots, yield tables, and the French national inventory data. The last dataset has sufficient geospatial coverage to allow a novel type of validation: inventory plots can be used to produce continuous maps that can be compared to continuous simulations for regional trends in standing volumes and volume increments. ORCHIDEE-FM performs better than simple statistical models for stand-level variables, which include tree density, basal area, standing volume, average circumference and height, when management intensity and initial conditions are known: model efficiency is improved by an average of 0.11, and its average bias does not exceed 25%. The performance of the model is less satisfying for tree-level variables, including extreme circumferences, tree circumference distribution and competition indices, or when management and initial conditions are unknown. At the regional level, when climate forcing is accurate for precipitation, ORCHIDEE-FM is able to reproduce most productivity patterns in France, such as the local lows of needleleaves in the Parisian basin and of broadleaves in south-central France. The simulation of water stress effects on biomass in the Mediterranean region, however, remains problematic, as does the simulation of the wood increment for coniferous trees. These pitfalls pertain to the general ORCHIDEE model rather than to the FMM. Overall, with an average bias seldom exceeding 40%, the performance of ORCHIDEE-FM is deemed reliable to use it as a new modelling tool in the study of the effects of interactions between forest management and climate on biomass stocks of forests across a range of scales from plot to country. Numéro de notice : A2011-285 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.ecolmodel.2010.08.038 Date de publication en ligne : 22/10/2010 En ligne : https://doi.org/10.1016/j.ecolmodel.2010.08.038 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102459
in Ecological modelling > vol 222 n° 1 (janvier 10, 2011) . - pp 57 - 75[article]
Titre : Enjeux et stratégies de substitution du hêtre en plaine Type de document : Mémoire Auteurs : Pauline Pecquet, Auteur Editeur : Paris, Nancy, ... : AgroParisTech (2007 -) Année de publication : 2011 Importance : 80 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Français (fre) Descripteur : [Termes IGN] changement climatique
[Termes IGN] enjeu
[Termes IGN] Fagus (genre)
[Termes IGN] impact sur l'environnement
[Termes IGN] phénologie
[Termes IGN] vulnérabilité
[Vedettes matières IGN] Ecologie forestièreIndex. décimale : MX Mémoires divers Résumé : (auteur) Le changement climatique annoncé va avoir de forts impacts sur les forêts de France. L'étude propose d'évaluer, à l'échelle de régions écologiques, la vulnérabilité du hêtre en prenant en considération les enjeux sylvicoles potentiellement menacés par la modification de son aire de distribution et par les perturbations phénologiques attendues. Par l'étude et la comparaison de modèles d'impact, l'essence apparaît très menacée et le risque, mesuré par la combinaison de la vulnérabilité et des enjeux, est majeur dans Nord-Est de la France et le long du littoral nord-atlantique. L'incertitude qui peut exister est quantifiée par l'analyse des divergences ente modèles. Des perspectives pour l'adaptation et une meilleure quantification du risque sont proposées. Numéro de notice : 17282 Affiliation des auteurs : non IGN Thématique : FORET Nature : Mémoire ingénieur En ligne : http://193.54.111.47/doc_num.php?explnum_id=3776 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82507 Documents numériques
en open access
Enjeux et stratégies de substitution du hêtreAdobe Acrobat PDFEffect of corn on C-an L-band radar backscatter: a correction method for soil moisture retrieval / A. Joseph in Remote sensing of environment, vol 114 n° 11 (15/11/2010)
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Titre : Effect of corn on C-an L-band radar backscatter: a correction method for soil moisture retrieval Type de document : Article/Communication Auteurs : A. Joseph, Auteur ; R. Van Der Velde, Auteur ; P. O'neill, Auteur ; R. Lang, Auteur ; T. Gish, Auteur Année de publication : 2010 Article en page(s) : pp 2417 - 2430 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] angle d'incidence
[Termes IGN] bande C
[Termes IGN] bande L
[Termes IGN] biomasse
[Termes IGN] humidité du sol
[Termes IGN] maïs (céréale)
[Termes IGN] polarimétrie radar
[Termes IGN] rétrodiffusion
[Termes IGN] teneur en eau de la végétationRésumé : (Auteur) This paper discusses the effects of vegetation on C- (4.75 GHz) and L- (1.6 GHz) band backscattering (Ó) measured throughout a growth cycle at incidence angles of 15, 35 and 55°. The utilized Ó data set was collected by a truck mounted scatterometer over a corn field and is supported by a comprehensive set of ground measurements, including soil moisture and vegetation biomass. Comparison of Ó measurement against simulations by the Integral Equation Method (IEM) surface scattering model (Fung et al., 1992) shows that the Ó measurements are dominated either by an attenuated soil return or by scattering from vegetation depending on the antenna configuration and growth stage. Further, the measured Ó is found to be sensitive to soil moisture even at peak biomass and large incidence angles, which is attributed to scattering along the soil-vegetation pathway. For the simulation of C-band Ó and the retrieval of soil moisture two methods have been applied, which are the semi-empirical water cloud model (Attema & Ulaby, 1978) and a novel method. This alternative method uses the empirical relationships between the vegetation water content (W) and the ratio of the bare soil and the measured Ó to correct for vegetation. It is found that this alternative method is superior in reproducing the measured Ó as well as retrieving soil moisture. The highest retrieval accuracies are obtained at a 35° incidence angle leading to RMSD's of 0.044 and 0.037 m3 m- 3 for the HH and VV-polarization, respectively. In addition, the sensitivity of these soil moisture retrievals to W and surface roughness parameter uncertainties is investigated. Numéro de notice : A2010-400 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2010.05.017 En ligne : https://doi.org/10.1016/j.rse.2010.05.017 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30593
in Remote sensing of environment > vol 114 n° 11 (15/11/2010) . - pp 2417 - 2430[article]vol 31 n° 17 - 18 - September 2010 - Pan ocean remote sensing : oceanic manifestation of global changes (Bulletin de International Journal of Remote Sensing IJRS) / G. Levy
PermalinkRecent changes in forest productivity: An analysis of national forest inventory data for common beech (Fagus sylvatica L.) in north-eastern France / Marie Charru in Forest ecology and management, vol 260 n° 5 (30 July 2010)
PermalinkStations forestières : durée de validité limitée / Denise Afxantidis in La feuille & l'aiguille, n° 79 (mai 2010)
PermalinkComprendre et maîtriser le coeur rouge du hêtre / Nicolas Gomez ; Jérôme Bock in Rendez-vous techniques, n° 27-28 (hiver - printemps 2010)
PermalinkContribution à l’étude des causes de dégradation de la forêt de Tamarix de la zone humide de la Macta (Algérie occidentale) / Benamar Belgherbi ; Khéloufi Benabdeli in Forêt méditerranéenne, vol 31 n° 1 (mars 2010)
PermalinkEstimating crown base height for Scots pine by means of the 3D geometry of airborne laser scanning data / Jari Vauhkonen in International Journal of Remote Sensing IJRS, vol 31 n° 5 (March 2010)
PermalinkCaractéristiques anatomiques des Populus sp. et cultivars / Nathalie Passedat in Forêt entreprise, n° 191 (mars 2010/2)
PermalinkCaractéristiques générales du bois et des fibres / Alain Berthelot ; Patrice Maine ; Alain Bouvet ; Denilson Da Silva Perez in Forêt entreprise, n° 191 (mars 2010/2)
PermalinkLes cultivars de peuplier. Caractéristiques mécaniques du bois / Didier Reuling ; Jean-Denis Lanvin ; Alain Bouvet ; Edouard Proust in Forêt entreprise, n° 191 (mars 2010/2)
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