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Remote sensing of seasonal variability of fractional vegetation cover and its object-based spatial pattern analysis over mountain areas / Guijun Yang in ISPRS Journal of photogrammetry and remote sensing, vol 77 (March 2013)
[article]
Titre : Remote sensing of seasonal variability of fractional vegetation cover and its object-based spatial pattern analysis over mountain areas Type de document : Article/Communication Auteurs : Guijun Yang, Auteur ; Ruiliang Pu, Auteur ; Jixian Zhang, Auteur ; Chunjiang Zhao, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 79 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] couvert végétal
[Termes IGN] effet atmosphérique
[Termes IGN] image Landsat-TM
[Termes IGN] montagne
[Termes IGN] Pékin (Chine)
[Termes IGN] variabilité
[Termes IGN] variation saisonnièreRésumé : (Auteur) Fractional vegetation cover (FVC) is an important indicator of mountain ecosystem status. A study on the seasonal changes of FVC can be beneficial for regional eco-environmental security, which contributes to the assessment of mountain ecosystem recovery and supports mountain forest planning and landscape reconstruction around megacities, for example, Beijing, China. Remote sensing has been demonstrated to be one of the most powerful and feasible tools for the investigation of mountain vegetation. However, topographic and atmospheric effects can produce enormous errors in the quantitative retrieval of FVC data from satellite images of mountainous areas. Moreover, the most commonly used analysis approach for assessing FVC seasonal fluctuations is based on per-pixel analysis regardless of the spatial context, which results in pixel-based FVC values that are feasible for landscape and ecosystem applications. To solve these problems, we proposed a new method that incorporates the use of a revised physically based (RPB) model to correct both atmospheric and terrain-caused illumination effects on Landsat images, an improved vegetation index (VI)-based technique for estimating the FVC, and an adaptive mean shift approach for object-based FVC segmentation. An array of metrics for segmented FVC analyses, including a variety of area metrics, patch metrics, shape metrics and diversity metrics, was generated. On the basis of the individual segmented FVC values and landscape metrics from multiple images of different dates, remote sensing of the seasonal variability of FVC was conducted over the mountainous area of Beijing, China. The experimental results indicate that (a) the mean value of the RPB–NDVI in all seasons was increased by approximately 10% compared with that of the atmospheric correction-NDVI; (b) a strong consistency was demonstrated between ground-based FVC observations and FVC estimated through remote sensing technology (R2 = 0.8527, RMSE = 0.0851); and (c) seasonal changes in the landscape characteristics existed, and the landscape diversity reached its maximum in May and June in the study area. Numéro de notice : A2013-117 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.11.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.11.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32255
in ISPRS Journal of photogrammetry and remote sensing > vol 77 (March 2013) . - pp 79 - 93[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2013031 RAB Revue Centre de documentation En réserve L003 Disponible Shifts of forest species along an elevational gradient in Southeast France: climate change or stand maturation ? / Jeanne Bodin in Journal of vegetation science, vol 24 n° 2 (March 2013)
[article]
Titre : Shifts of forest species along an elevational gradient in Southeast France: climate change or stand maturation ? Type de document : Article/Communication Auteurs : Jeanne Bodin, Auteur ; Vincent Badeau, Auteur ; Eric Bruno , Auteur ; Catherine Cluzeau, Auteur ; Jean-Marc Moisselin, Auteur ; Gian-Reto Walther, Auteur ; Jean-Luc Dupouey, Auteur Année de publication : 2013 Article en page(s) : pp 269 - 283 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] changement climatique
[Termes IGN] climax
[Termes IGN] gradient d'altitude
[Termes IGN] montagne
[Termes IGN] plaine
[Termes IGN] Provence-Alpes-Côte d'Azur
[Termes IGN] Rhône-Alpes
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) Aim: Recent vegetation changes in mountain areas are often explained by climate warming. However, effects of land-use changes, such as recolonization of abandoned pastures by forest, are difficult to separate from those of climate change. Even within forest belts, changes in stand structure due to forest management and stand maturation could confound the climate signal. Here, we evaluate the direction and rate of plant species elevation shifts in mountain forests, considering the role of stand dynamics.
Location: Forests in the plains and mountains of Southeast France.
Methods: We compared floristic data from the French National Forest Inventory collected in the 1980s and 1990s. They provided a large-scale (30 985 plots) and representative sample of vegetation between 0 and 2500 m a.s.l. Species response curves along the elevation and exposure gradients were fitted with a logistic regression model. In order to assess the effect of changes in successional stages of the forest stands, we compared plant species shifts in the whole set of stands with those solely in closed stands.
Results: A total of 62 species shifted downward, whereas 113 shifted upward, resulting in a significant upward mean shift of 17.9 m. Upward shifting species were preferentially woody and heliophilous, suggesting a role for forest closure and maturation in the observed changes. Excluding all open forest stages from analyses, the upward trend became weaker (!3.0 m) and was not significant. Forests of the study area have undergone closure and maturation, more strongly at lower altitudes than at higher ones, producing an apparent shift of species.
Conclusions: In the mountain relief of Southeast France, changes in the successional stages of stands appear as the main cause of the apparent upslope movement of forest species. Since a similar trend of forest maturation exists in large areas throughout Europe, forest dynamics should be better taken into account among the causes of vegetation changes before inferring any climate change effect.Numéro de notice : A2013-797 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : FORET Nature : Article DOI : 10.1111/j.1654-1103.2012.01456.x En ligne : https://dx.doi.org/10.1111/j.1654-1103.2012.01456.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80579
in Journal of vegetation science > vol 24 n° 2 (March 2013) . - pp 269 - 283[article]Documents numériques
en open access
Shifts of forest speciesAdobe Acrobat PDF Combining terrestrial stereophotogrammetry, DGPS and GIS-based 3D voxel modelling in the volumetric recording of archaeological features / H. Orengo in ISPRS Journal of photogrammetry and remote sensing, vol 76 (February 2013)
[article]
Titre : Combining terrestrial stereophotogrammetry, DGPS and GIS-based 3D voxel modelling in the volumetric recording of archaeological features Type de document : Article/Communication Auteurs : H. Orengo, Auteur Année de publication : 2013 Article en page(s) : pp 49 - 55 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] acquisition d'images
[Termes IGN] archéométrie
[Termes IGN] géoréférencement indirect
[Termes IGN] GPS en mode différentiel
[Termes IGN] grotte
[Termes IGN] modélisation 3D
[Termes IGN] orthoimage
[Termes IGN] photogrammétrie métrologique
[Termes IGN] système d'information géographique
[Termes IGN] voxelRésumé : (Auteur) Archaeological recording of structures and excavations in high mountain areas is greatly hindered by the scarce availability of both space, to transport material, and time. The Madriu-Perafita-Claror, InterAmbAr and PCR Mont Lozère high mountain projects have documented hundreds of archaeological structures and carried out many archaeological excavations. These projects required the development of a technique which could record both structures and the process of an archaeological excavation in a fast and reliable manner. The combination of DGPS, close-range terrestrial stereophotogrammetry and voxel based GIS modelling offered a perfect solution since it helped in developing a strategy which would obtain all the required data on-site fast and with a high degree of precision. These data are treated off-site to obtain georeferenced orthoimages covering both the structures and the excavation process from which site and excavation plans can be created. The proposed workflow outputs also include digital surface models and volumetric models of the excavated areas from which topography and archaeological profiles were obtained by voxel-based GIS procedures. In this way, all the graphic recording required by standard archaeological practices was met. Numéro de notice : A2013-091 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.07.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.07.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32229
in ISPRS Journal of photogrammetry and remote sensing > vol 76 (February 2013) . - pp 49 - 55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2013021 RAB Revue Centre de documentation En réserve L003 Disponible Continental mass change from GRACE over 2002–2011 and its impact on sea level / O. Baur in Journal of geodesy, vol 87 n° 2 (February 2013)
[article]
Titre : Continental mass change from GRACE over 2002–2011 and its impact on sea level Type de document : Article/Communication Auteurs : O. Baur, Auteur ; M. Kuhn, Auteur ; Will E. Featherstone, Auteur Année de publication : 2013 Article en page(s) : pp 117 - 125 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse diachronique
[Termes IGN] continent
[Termes IGN] données GRACE
[Termes IGN] eau de fonte
[Termes IGN] géocentre
[Termes IGN] levé gravimétrique
[Termes IGN] masse de la Terre
[Termes IGN] niveau de la mer
[Termes IGN] niveau moyen des mers
[Termes IGN] variationRésumé : (Auteur) Present-day continental mass variation as observed by space gravimetry reveals secular mass decline and accumulation. Whereas the former contributes to sea-level rise, the latter results in sea-level fall. As such, consideration of mass accumulation (rather than focussing solely on mass loss) is important for reliable overall estimates of sea-level change. Using data from the Gravity Recovery And Climate Experiment satellite mission, we quantify mass-change trends in 19 continental areas that exhibit a dominant signal. The integrated mass change within these regions is representative of the variation over the whole land areas. During the integer 9-year period of May 2002 to April 2011, GIA-adjusted mass gain and mass loss in these areas contributed, on average, to -(0.7 + 0.4) mm/year of sea-level fall and + (1.8 + 0.2) mm/year of sea-level rise; the net effect was + (1.1 + 0.6) mm/year. Ice melting over Greenland, Iceland, Svalbard, the Canadian Arctic archipelago, Antarctica, Alaska and Patagonia was responsible for + (1.4+0.2) mm/year of the total balance. Hence, land-water mass accumulation compensated about 20 % of the impact of ice-melt water influx to the oceans. In order to assess the impact of geocentre motion, we converted geocentre coordinates derived from satellite laser ranging (SLR) to degree-one geopotential coefficients. We found geocentre motion to introduce small biases to mass-change and sea-level change estimates; its overall effect is + (0.1 + 0.1) mm/year. This value, however, should be taken with care owing to questionable reliability of secular trends in SLR-derived geocentre coordinates. Numéro de notice : A2013-098 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0583-2 Date de publication en ligne : 14/07/2012 En ligne : https://doi.org/10.1007/s00190-012-0583-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32236
in Journal of geodesy > vol 87 n° 2 (February 2013) . - pp 117 - 125[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013021 SL Revue Centre de documentation Revues en salle Disponible HyMeX, les campagnes de mesures : focus sur les événements extrêmes en Méditerranée / Véronique Ducrocq in La Météorologie, n° 80 (février 2013)
[article]
Titre : HyMeX, les campagnes de mesures : focus sur les événements extrêmes en Méditerranée Type de document : Article/Communication Auteurs : Véronique Ducrocq, Auteur ; Sophie Belamari, Auteur ; Brice Boudevillain, Auteur ; Olivier Bousquet, Auteur ; Philippe Cocquerez, Auteur ; Alexis Doerenbecher, Auteur ; Philippe Drobinski, Auteur ; Cyrille Flamant, Auteur ; Laurent Labatut, Auteur ; Dominique Lambert, Auteur ; Mathieu Nuret, Auteur ; Evelyne Richard, Auteur ; Odile Roussot, Auteur ; Pierre Testor, Auteur ; Philippe Arbogast, Auteur ; Pierre-Alain Ayral, Auteur ; J. van Baelen, Auteur ; Claude Basdevant, Auteur ; Jean-Luc Boichard, Auteur ; Denis Bourras, Auteur ; Christophe Bouvier, Auteur ; Marie-Noëlle Bouin , Auteur ; Olivier Bock , Auteur ; et al., Auteur Année de publication : 2013 Projets : HyMeX / Richard, Evelyne Article en page(s) : pp 37 - 47 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Hydrologie
[Termes IGN] changement climatique
[Termes IGN] crue
[Termes IGN] données hydrographiques
[Termes IGN] données météorologiques
[Termes IGN] données spatiotemporelles
[Termes IGN] France (hydrographie)
[Termes IGN] Méditerranée, mer
[Termes IGN] précipitation
[Termes IGN] risque naturel
[Termes IGN] ventRésumé : (Auteur) Les risques hydrométéorologiques sont au coeur du programme de recherche HyMeX sur le cycle de l'eau en Méditerranée. HyMeX a pour ambition d'améliorer leur prévision, de mieux connaître leur variabilité à l'échelle pluriannuelle et de renseigner sur leur évolution, dans le contexte du changement climatique. À cette fin, deux campagnes de mesures dédiées à ces événements extrêmes (SOP1 : pluies intenses et crues rapides ; SOP2 : vents forts et formation d'eaux denses) sont organisées en Méditerranée nord-occidentale, entre septembre 2012 et mars 2013. Numéro de notice : A2013-846 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.4267/2042/48793 Date de publication en ligne : 01/02/2013 En ligne : https://doi.org/10.4267/2042/48793 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95590
in La Météorologie > n° 80 (février 2013) . - pp 37 - 47[article]Documents numériques
en open access
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