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Improving Cartosat-1 DEM accuracy using synthetic stereo pair and triplet / D. Giribabu in ISPRS Journal of photogrammetry and remote sensing, vol 77 (March 2013)
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Titre : Improving Cartosat-1 DEM accuracy using synthetic stereo pair and triplet Type de document : Article/Communication Auteurs : D. Giribabu, Auteur ; S. Srinivasa Rao, Auteur ; Y.V.N. Krishna Murthy, Auteur Année de publication : 2013 Article en page(s) : pp 31 - 43 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] couple stéréoscopique
[Termes IGN] Himalaya
[Termes IGN] image Cartosat-1
[Termes IGN] image tri-stéréoscopique
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle stéréoscopique
[Termes IGN] montagneRésumé : (Auteur) Cartosat–1 is the first Indian Remote Sensing Satellite capable of providing along-track stereo images. Cartosat–1 provides forward stereo images with look angles +26° and -5° with respect to nadir for generating Digital Elevation Models (DEMs), Orthoimages and value added products for various applications. A pitch bias of -21° to the satellite resulted in giving reverse tilt mode stereo pair with look angles of +5° and -26° with respect to nadir. This paper compares DEMs generated using forward, reverse and other possible synthetic stereo pairs for two different types of topographies. Stereo triplet was used to generate DEM for Himalayan mountain topography to overcome the problem of occlusions. For flat to undulating topography it was shown that using Cartosat-1 synthetic stereo pair with look angles of -26° and +26° will produce improved version of DEM. Planimetric and height accuracy (Root Mean Square Error (RMSE)) of less than 2.5 m and 2.95 m respectively were obtained and qualitative analysis shows finer details in comparison with other DEMs. For rugged terrain and steep slopes of Himalayan mountain topography simple stereo pairs may not provide reliable accuracies in DEMs due to occlusions and shadows. Stereo triplet from Cartosat-1 was used to generate DEM for mountainous topography. This DEM shows better reconstruction of elevation model even at occluded region when compared with simple stereo pair based DEM. Planimetric and height accuracy (RMSE) of nearly 3 m were obtained and qualitative analysis shows reduction of outliers at occluded region. Numéro de notice : A2013-113 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.12.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.12.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32251
in ISPRS Journal of photogrammetry and remote sensing > vol 77 (March 2013) . - pp 31 - 43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2013031 RAB Revue Centre de documentation En réserve L003 Disponible 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)
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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)
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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 PDFCombining 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)
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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
Titre : Analyse de la qualité des MNT issus de vols LiDAR en forêt de montagne Type de document : Mémoire Auteurs : Xavier Wanner, Auteur Editeur : Strasbourg : Institut National des Sciences Appliquées INSA Strasbourg Année de publication : 2013 Importance : 83 p. Format : 21 x 30 cm Note générale : Bibliographie
Mémoire de soutenance de Diplôme d'Ingénieur INSA, Spécialité TopographieLangues : Français (fre) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] évaluation des données
[Termes IGN] forêt tempérée
[Termes IGN] interpolation
[Termes IGN] modèle numérique de terrain
[Termes IGN] montagne
[Termes IGN] point d'appui
[Termes IGN] qualité des données
[Termes IGN] traitement de donnéesIndex. décimale : INSAS Mémoires d'ingénieur de l'INSA Strasbourg - Topographie, ex ENSAIS Résumé : (Auteur) Dans le cadre du projet FORESEE pour la recherche d’outils d’aide à l’exploitation de la ressource forestière, le LiDAR s’est imposé comme une évidence. Les forêts de montagnes sont par essence des milieux difficiles d’accès. A l’aide de méthodes topographiques pour la détermination de points de contrôle, les influences de la pente et de la densité de points « sol » ont pu être testée sur la précision du MNT. Pour un vol dont l’empreinte du faisceau LiDAR est de 25cm, les précisions observées sur le MNT sont comprises entre 10cm et 17cm. Elles sont comprises entre 22cm et 37cm pour un vol dont l’empreinte est de 80cm. Les taux de pénétrations ont également été étudiés en fonction du type de forêt et de l’époque d’acquisition des données. Moins de 25% du signal pénètre en-feuille, tandis qu’il se situe aux alentours de 40% hors-feuille. Note de contenu : Introduction
1- Etat de l'art
2- Méthode
3- Résultats
ConclusionNuméro de notice : 21140 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Mémoire ingénieur INSAS Organisme de stage : Office National des Forêts Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=51194 Documents numériques
en open access
21140_mem_insas_2013__wanner.pdfAdobe Acrobat PDF PermalinkPermalinkComparaison et évaluation de méthodes d'extraction automatique d'objets sur des images optique et radar / Charlotte Benedetto (2013)
PermalinkPermalinkPermalinkImpact of scale and quality of Digital Terrain Models on predictability of seabed terrain types / Lars Erikstad in Marine geodesy, vol 36 n° 1 (January - March 2013)
PermalinkLarge-scale water classification of coastal areas using airborne topographic lidar data / Julien Smeeckaert (juillet 2013)
PermalinkPermalinkPermalinkPermalinkPredicting surface fuel models and fuel metrics using Lidar and CIR imagery in a dense, mountainous forest / Marek Jakubowksi in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 1 (January 2013)
PermalinkLes résolutions des bases de données "occupation du sol" et la mesure du changement / Aurélie Bousquet in Espace géographique, vol 42 n° 1 (janvier - mars 2013)
PermalinkPermalinkApports des données ALOS PALSAR polarimétriques à la détection des zones humides littorales (Sassandra, Côte d'Ivoire) / Kouakou Hervé Kouassi in Photo interprétation, European journal of applied remote sensing, vol 48 n° 4 (décembre 2012)
PermalinkCartographie des zones humides de montagne par télédétection : Potentialités des images à très haute résolution spatiale / L. Vacquié in Revue internationale de géomatique, vol 22 n° 4 (décembre 2012 – février 2013)
PermalinkEvaluation of satellite-derived agro-climate variables in the Northern Great Plains of the United States / R. Lemons in Geocarto international, vol 27 n° 8 (December 2012)
PermalinkGeographic information system–based morphometric characterization of sub-watersheds of Meenachil river basin, Kottayam district, Kerala, India / M. Vincy in Geocarto international, vol 27 n° 8 (December 2012)
PermalinkAirborne lidar for natural environments: research and applications in France / C. Puech in Revue Française de Photogrammétrie et de Télédétection, n° 200 (Novembre 2012)
PermalinkAutomatic generation of 2.5D terrain models without occluding routes of interest / Hao Deng in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)
PermalinkEdge-guided multiscale segmentation of satellite multispectral imagery / J. Chen in IEEE Transactions on geoscience and remote sensing, vol 50 n° 11 Tome 1 (November 2012)
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