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Photogrammetric techniques for the determination of spatio-temporal velocity fields at glaciar San Rafael, Chile / Hans-Gerd Maas in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 3 (March 2013)
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Titre : Photogrammetric techniques for the determination of spatio-temporal velocity fields at glaciar San Rafael, Chile Type de document : Article/Communication Auteurs : Hans-Gerd Maas, Auteur ; G. Casasa, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 299 - 306 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse spatio-temporelle
[Termes IGN] champ de vitesse
[Termes IGN] Chili
[Termes IGN] géoréférencement
[Termes IGN] glacier
[Termes IGN] image terrestre
[Termes IGN] Patagonie
[Termes IGN] positionnement par GPS
[Termes IGN] séquence d'imagesRésumé : (Auteur) Glaciar San Rafael in the Northern Patagonia Icefield, with a length of 46 km and an ice area of 722 km2, is the lowest latitude tidewater outlet glacier in the world and one of the fastest and most productive glaciers in southern South America in terms of iceberg flux. Spatio-temporal velocity fields in the region of the glacier front were determined from monoscopic terrestrial image sequences recorded by an inter-vallometer mode high-resolution digital camera over several days. In these image sequences, a large number of glacier surface points were tracked by subpixel accuracy feature tracking techniques. Scaling and georeferencing of the trajectories obtained from image space tracking was performed using a multi-station GPS-supported photogrammetric net-work. The technique allows for tracking hundreds of glacier surface points at a measurement accuracy in the order of one decimeter, for typical glacier movement rates, and an almost arbitrarily high temporal resolution. The results show velocities of up to 16 meters per day. Numéro de notice : A2013-106 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.79.3.299 En ligne : https://doi.org/10.14358/PERS.79.3.299 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32244
in Photogrammetric Engineering & Remote Sensing, PERS > vol 79 n° 3 (March 2013) . - pp 299 - 306[article]Les réseaux techniques comme vecteurs de distribution des risques en milieu urbain / Serge Lhomme in Cartes & Géomatique, n° 215 (mars 2013)
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Titre : Les réseaux techniques comme vecteurs de distribution des risques en milieu urbain Type de document : Article/Communication Auteurs : Serge Lhomme, Auteur Année de publication : 2013 Article en page(s) : pp 9 - 13 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse vectorielle
[Termes IGN] cartographie des flux
[Termes IGN] Dublin (Irlande ; ville)
[Termes IGN] réseau technique
[Termes IGN] réseau technique urbain
[Termes IGN] résilience écologique
[Termes IGN] risque technologique
[Termes IGN] système d'information géographique
[Termes IGN] zone inondableRésumé : (Auteur) [conclusion] Cette recherche rigoureuse d'un point de vue théorique (définition précise du concept de résilience, définition d'un cadre méthodologique solide...) s'est aussi voulue soucieuse de trouver des applications pratiques (développement d'une méthodologie et d'un prototype SIG appliqués à la ville de Dublin). De nombreux aspects peuvent néanmoins encore être améliorés comme la modélisation de la dynamique des flux au sein des réseaux techniques, la prise en compte des aspects probabilistes et temporels en matière de modélisation des interdépendances entre réseaux techniques, la prise en considération des aspects organisationnels pour modéliser la remise en service des réseaux techniques ... Toutes ces limites constituent en fait autant de pistes pour des recherches futures. Numéro de notice : A2013-437 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : http://www.lecfc.fr/new/articles/215-article-2.pdf Format de la ressource électronique : URLL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32575
in Cartes & Géomatique > n° 215 (mars 2013) . - pp 9 - 13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 021-2013011 RAB Revue Centre de documentation En réserve L003 Disponible Sampling piecewise convex unmixing and endmember extraction / Alina Zare in IEEE Transactions on geoscience and remote sensing, vol 51 n° 3 Tome 2 (March 2013)
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Titre : Sampling piecewise convex unmixing and endmember extraction Type de document : Article/Communication Auteurs : Alina Zare, Auteur ; Paul Garder, Auteur ; George Casella, Auteur Année de publication : 2013 Article en page(s) : pp 1655 - 1665 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] algorithme du simplexe
[Termes IGN] analyse des mélanges spectraux
[Termes IGN] échantillonnage d'image
[Termes IGN] ensemble convexe
[Termes IGN] image hyperspectrale
[Termes IGN] méthode de Monte-Carlo
[Termes IGN] signature spectraleRésumé : (Auteur) A Metropolis-within-Gibbs sampler for piecewise convex hyperspectral unmixing and endmember extraction is presented. The standard linear mixing model used for hyperspectral unmixing assumes that hyperspectral data reside in a single convex region. However, hyperspectral data are often nonconvex. Furthermore, in standard endmember extraction and unmixing methods, endmembers are generally represented as a single point in the high-dimensional space. However, the spectral signature for a material varies as a function of the inherent variability of the material and environmental conditions. Therefore, it is more appropriate to represent each endmember as a full distribution and use this information during spectral unmixing. The proposed method searches for several sets of endmember distributions. By using several sets of endmember distributions, a piecewise convex mixing model is applied, and given this model, the proposed method performs spectral unmixing and endmember estimation given this nonlinear representation of the data. Each set represents a random simplex. The vertices of the random simplex are modeled by the endmember distributions. The hyperspectral data are partitioned into sets associated with each of the extracted sets of endmember distributions using a Dirichlet process prior. The Dirichlet process prior also estimates the number of sets. Thus, the Metropolis-within-Gibbs sampler partitions the data into convex regions, estimates the required number of convex regions, and estimates endmember distributions and abundance values for all convex regions. Results are presented on real hyperspectral and simulated data that indicate the ability of the method to effectively estimate endmember distributions and the number of sets of endmember distributions. Numéro de notice : A2013-134 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2207905 En ligne : https://doi.org/10.1109/TGRS.2012.2207905 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32272
in IEEE Transactions on geoscience and remote sensing > vol 51 n° 3 Tome 2 (March 2013) . - pp 1655 - 1665[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2013031B RAB Revue Centre de documentation En réserve L003 Disponible A GIS-based vehicle mobility estimator for operational contexts / A. Homann in Transactions in GIS, vol 17 n° 1 (February 2013)
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Titre : A GIS-based vehicle mobility estimator for operational contexts Type de document : Article/Communication Auteurs : A. Homann, Auteur ; G. Grandjean, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 78 - 95 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] données localisées
[Termes IGN] estimateur
[Termes IGN] interface logicielle
[Termes IGN] itinéraire
[Termes IGN] mobilité humaine
[Termes IGN] navigation automobile
[Termes IGN] optimisation (mathématiques)
[Termes IGN] outil d'aide à la décision
[Termes IGN] système d'information géographiqueRésumé : (Auteur) A vehicle mobility estimator has been developed to produce decision aid maps for projecting civil or military forces on operational theatres. Based on the exploitation of classical geographical sources (e.g. digital elevation models, optical images, and vector databases) and thematic sources (e.g. climate, meteorological, pedological and land cover databases), the system computes speed maps for different kinds of vehicles moving both on-road and off-road. Such computations are realized through a ground-vehicle interaction module that estimates the vehicle performance from experimental results, numerical simulations and empirical relationships. The system's architecture is built using a GIS interface that manages the data, the computation and the presentation layers. An operational version of this tool has been tested and validated on several operational theatres in France and in northern Africa. The results show good agreement between the predicted mobility performance of various vehicles and those observed on the field. A case study is presented to illustrate the mobility maps and demonstrate their relevance in the decision-making chain depending on different climate contexts. A short application to itinerary optimization is presented as a promising future application. Numéro de notice : A2013-041 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01351.x Date de publication en ligne : 03/02/2013 En ligne : https://doi.org/10.1111/j.1467-9671.2012.01351.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32179
in Transactions in GIS > vol 17 n° 1 (February 2013) . - pp 78 - 95[article]Joint wall mitigation and compressive sensing for indoor image reconstruction / E. Lagunas in IEEE Transactions on geoscience and remote sensing, vol 51 n° 2 (February 2013)
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Titre : Joint wall mitigation and compressive sensing for indoor image reconstruction Type de document : Article/Communication Auteurs : E. Lagunas, Auteur ; M. Armin, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 891 - 906 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] acquisition comprimée
[Termes IGN] carte d'intérieur
[Termes IGN] détection à travers-le-mur
[Termes IGN] fouillis d'échos
[Termes IGN] image radar
[Termes IGN] objet mobile
[Termes IGN] positionnement en intérieur
[Termes IGN] reconstruction d'imageRésumé : (Auteur) Compressive sensing (CS) for urban operations and through-the-wall radar imaging has been shown to be successful in fast data acquisition and moving target localizations. The research in this area thus far has assumed effective removal of wall electromagnetic backscatterings prior to CS application. Wall clutter mitigation can be achieved using full data volume which is, however, in contradiction with the underlying premise of CS. In this paper, we enable joint wall clutter mitigation and CS application using a reduced set of spatial-frequency observations in stepped frequency radar platforms. Specifically, we demonstrate that wall mitigation techniques, such as spatial filtering and subspace projection, can proceed using fewer measurements. We consider both cases of having the same reduced set of frequencies at each of the available antenna locations and also when different frequency measurements are employed at different antenna locations. The latter casts a more challenging problem, as it is not amenable to wall removal using direct implementation of filtering or projection techniques. In this case, we apply CS at each antenna individually to recover the corresponding range profile and estimate the scene response at all frequencies. In applying CS, we use prior knowledge of the wall standoff distance to speed up the convergence of the orthogonal matching pursuit for sparse data reconstruction. Real data are used for validation of the proposed approach. Numéro de notice : A2013-084 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2203824 En ligne : https://doi.org/10.1109/TGRS.2012.2203824 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32222
in IEEE Transactions on geoscience and remote sensing > vol 51 n° 2 (February 2013) . - pp 891 - 906[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2013021 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkAssessment of regression kriging for spatial interpolation: comparisons of seven GIS interpolation methods / Qingmin Meng in Cartography and Geographic Information Science, vol 40 n° 1 (January 2013)PermalinkPermalinkPermalinkPermalinkEstimation of mass change trends in the Earth’s system on the basis of GRACE satellite data, with application to Greenland / C. Siemes in Journal of geodesy, vol 87 n° 1 (January 2013)PermalinkEstimation de la qualité des résultats [d'une] classification sous ENVI / Nidal Aburajab (2013)PermalinkGlobal height system unification with GOCE: a simulation study on the indirect bias term in the GBVP approach / C. Gerlach in Journal of geodesy, vol 87 n° 1 (January 2013)PermalinkIAG WG SC1.3 on regional dense velocity fields : First results and steps ahead / Carine Bruyninx (2013)PermalinkPermalinkManual of photogrammetry, sixth edition / J. Chris Mcglone (2013)PermalinkPredicting 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)PermalinkReliability of partial ambiguity fixing with multiple GNSS constellations / J. Wang in Journal of geodesy, vol 87 n° 1 (January 2013)PermalinkPermalinkSemisupervised local discriminant analysis for feature extraction in hyperspectral images / W. Liao in IEEE Transactions on geoscience and remote sensing, vol 51 n° 1 Tome 1 (January 2013)PermalinkShared Earth modeling / Michel Perrin (2013)PermalinkImpact of the quality of spatial 3D city models on sensor networks placement optimization / M. Argany in Geomatica, vol 66 n° 4 (December 2012)PermalinkMitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field / Alvaro Santamaria Gomez in Global and Planetary Change, vol 98 - 99 (December 2012)PermalinkFourier-series representation and projection of spherical harmonic functions / H. Cheong in Journal of geodesy, vol 86 n° 11 (November 2012)PermalinkTriangular factorization-based simplex algorithms for hyperspectral unmixing / W. Xia in IEEE Transactions on geoscience and remote sensing, vol 50 n° 11 Tome 1 (November 2012)Permalink