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Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya / Mireille Flouzat in Geophysical journal international, vol 178 n° 3 (September 2009)
[article]
Titre : Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya Type de document : Article/Communication Auteurs : Mireille Flouzat, Auteur ; Pierre Bettinelli, Auteur ; Pascal Willis , Auteur ; Jean-Philippe Avouac, Auteur ; Thierry Héritier, Auteur ; Umesh Gautam, Auteur Année de publication : 2009 Projets : 1-Pas de projet / Article en page(s) : pp 1246 - 1259 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] Himalaya
[Termes IGN] propagation troposphérique
[Termes IGN] série temporelle
[Termes IGN] variation saisonnièreRésumé : (auteur) Geodetic time-series from continuous GPS (cGPS) and 1 DORIS stations across the Himalaya of central Nepal show strong seasonal fluctuations observed on the horizontal and vertical components. Because the fluctuations determined at the different stations have similar phase but different amplitudes, these observations would imply that the secular shortening across the range is modulated by a seasonal strain. Given the geographic and climatic setting, there is however a possibility that the GPS positions be biased by tropospheric effects. We process these data using two different software packages and two different analysis strategies. Our analysis shows evidence for 1-strong seasonal fluctuation of zenithal delays consistent with in situ meteorological data and two strong horizontal tropospheric gradients in particular in the EW direction, that is, parallel to the mountain front at Gumba, also detected in DORIS results. We show that the tropospheric effects cannot however be the source of the observed seasonality of horizontal strain. This study supports the view that the seasonal strain in the Himalaya is real and probably driven by seasonal surface load variations. Our study adds support to the view that seasonal variations of seismicity in the Himalaya reflects seasonal variations of geodetic strain. Numéro de notice : A2009-604 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2009.04252.x En ligne : https://doi.org/10.1111/j.1365-246X.2009.04252.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95755
in Geophysical journal international > vol 178 n° 3 (September 2009) . - pp 1246 - 1259[article]La magie des huit mille / M. Bianchi (2009)
Titre : La magie des huit mille : Les quatorze sommets les plus hauts de la Terre Type de document : Monographie Auteurs : M. Bianchi, Auteur Editeur : Paris : National Geographic [France] Année de publication : 2009 Importance : 263 p. Format : 27 x 30 cm ISBN/ISSN/EAN : 978-2-84582-300-6 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géographie mondiale
[Termes IGN] Himalaya
[Termes IGN] montagne
[Termes IGN] sommet (relief)Résumé : (Editeur) Les quatorze huit mille - les sommets de plus de 8 000 m d'altitude - vécus, photographiés et racontés ici par un alpiniste. L'auteur a sélectionné, deux cent cinquante images pour illustrer l'âpre beauté de cette nature encore vierge et la vie des peuples habitant ces territoires inhospitaliers. Des panoramas grandioses nous font vivre en direct une aventure originale et partager la magie de ces sites immenses perdus aux frontières de l'infini : " Ce qui m'a toujours frappé dans ces contrées, c'est la sensation d'atmosphère irréelle que l'on n'éprouve, normalement, que dans le rêve. Dans l'Himalaya, le voyageur remonte le temps pour se retrouver à une époque où l'aventure et l'exploration faisaient encore partie du quotidien. On peut alors connaître de brefs instants d'une joie que seule la rencontre avec l'inconnu est susceptible d'offrir. " La nouvelle édition de ce magnifique ouvrage est judicieusement complétée de fiches descriptives des quatorze huit mille, comprenant toutes les caractéristiques techniques et les informations à connaître sur chaque montagne (altitude, signification du nom, historique des ascensions...). Vous aurez alors toutes les clés pour découvrir ces géants. Note de contenu : - Introduction
- Le Karakorum
- L'Himalaya
- Le Nanga Parbat
- L'Himalaya népalais
- L'Himalaya tibétain
- Les 14 huit mille
- Index des nomsNuméro de notice : 14159 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62618 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 14159-01 BOLI Livre Centre de documentation En réserve L003 Disponible Multisource classification using Support Vector Machines: an empirical comparison with Decision Tree and Neural Network classifiers / P. Watanachaturaporn in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 2 (February 2008)
[article]
Titre : Multisource classification using Support Vector Machines: an empirical comparison with Decision Tree and Neural Network classifiers Type de document : Article/Communication Auteurs : P. Watanachaturaporn, Auteur ; M. Arora, Auteur ; K. Varshney, Auteur Année de publication : 2008 Article en page(s) : pp 239 - 246 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse comparative
[Termes IGN] classification par arbre de décision
[Termes IGN] classification par réseau neuronal
[Termes IGN] classification par séparateurs à vaste marge
[Termes IGN] données multisources
[Termes IGN] extraction automatique
[Termes IGN] Himalaya
[Termes IGN] image IRS-LISS
[Termes IGN] Kappa de Cohen
[Termes IGN] modèle numérique de surface
[Termes IGN] occupation du solRésumé : (Auteur) Remote sensing image classification has proven to be attractive for extracting useful thematic information such as landcover. However, often for a given application, spectral information acquired by a remote sensing sensor may not be sufficient to derive accurate information. Incorporation of data from other sources such as a digital elevation model (DEM), and geophysical and geological data may assist in achieving more accurate land-cover classification from remote sensing images. Recently, support vector machines (SVM) have been proposed as an alternative for classification of remote sensing data, and the results are promising. In this paper, we employ the SVM algorithm to perform multisource classification. An IRS–1C LISS III image along with normalized differenced vegetation index (NDVI) image and DEM are used to produce a land-cover classification for a region in the Himalayas. The accuracy of SVM-based multisource classification is compared with several other nonparametric algorithms namely a decision tree classifier, and back propagation and radial basis function neural network classifiers. The well-known kappa coefficient of agreement is used to assess classification accuracy. The differences in the kappa coefficient of classifiers have been statistically evaluated using a pairwise Z-test. The results show a significant increase in the accuracy of the SVM based classifier on incorporation of ancillary data over classification performed solely on the basis of spectral data from remote sensing sensors. Copyright ASPRS Numéro de notice : A2008-048 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.74.2.239 En ligne : https://doi.org/10.14358/PERS.74.2.239 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29043
in Photogrammetric Engineering & Remote Sensing, PERS > vol 74 n° 2 (February 2008) . - pp 239 - 246[article]350 first order points selected: creation of a geodetic reference frame in WGS-84 datum for Cartosat in India / K.S. Rao in Geoinformatics, vol 10 n° 8 (01/12/2007)
[article]
Titre : 350 first order points selected: creation of a geodetic reference frame in WGS-84 datum for Cartosat in India Type de document : Article/Communication Auteurs : K.S. Rao, Auteur ; K. Kalyanaraman, Auteur Année de publication : 2007 Article en page(s) : pp 16 - 20 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] Bernese
[Termes IGN] Everest
[Termes IGN] image Cartosat-1
[Termes IGN] Inde
[Termes IGN] point d'appui
[Termes IGN] repère de référence
[Termes IGN] réseau géodésique local
[Termes IGN] sphèroïde
[Termes IGN] système de référence local
[Termes IGN] triangulation d'autres pays
[Termes IGN] World Geodetic System 1984Résumé : (Editeur) The Great Trigonometrical Survey of India was completed in the 19th century under the leadership of the great surveyors, William Lambton and Sir George Everest. Most of the triangulation network points established over high hills are either inaccessible or have been destroyed. The error is more than the Ground Control Point (GCP) accuracy required for the Cartosat-1 GCP library (GCPL), which rules out the usage of these Greater Triangulation Network points as reference points for the GCP library. This essentially requires the establishment of a reference frame in a suitable datum system. Copyright GEOinformatics Numéro de notice : A2007-562 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28925
in Geoinformatics > vol 10 n° 8 (01/12/2007) . - pp 16 - 20[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 262-07081 SL Revue Centre de documentation Revues en salle Disponible Plate Motion of India and Interseismic Strain in the Nepal Himalaya from GPS and DORIS Measurements / Pierre Bettinelli in Journal of geodesy, vol 80 n° 8-11 (November 2006)
[article]
Titre : Plate Motion of India and Interseismic Strain in the Nepal Himalaya from GPS and DORIS Measurements Type de document : Article/Communication Auteurs : Pierre Bettinelli, Auteur ; Jean-Philippe Avouac, Auteur ; Mireille Flouzat, Auteur ; F. Jouanne, Auteur ; Laurent Bollinger, Auteur ; Pascal Willis , Auteur ; Gyani Raja Chitrakar, Auteur Année de publication : 2006 Article en page(s) : pp 567 - 589 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] Himalaya
[Termes IGN] tectonique des plaquesRésumé : (auteur) We analyse geodetically estimated deformation across the Nepal Himalaya in order to determine the geodetic rate of shortening between Southern Tibet and India, previously proposed to range from 12 to 21 mm yr−1. The dataset includes spirit-levelling data along a road going from the Indian to the Tibetan border across Central Nepal, data from the DORIS station on Everest, which has been analysed since 1993, GPS campaign measurements from surveys carried on between 1995 and 2001, as well as data from continuous GPS stations along a transect at the logitude of Kathmandu operated continuously since 1997. The GPS data were processed in International Terrestrial Reference Frame 2000 (ITRF2000), together with the data from 20 International GNSS Service (IGS) stations and then combined using quasi- observation combination analysis (QOCA). Finally, spatially complementary velocities at stations in Southern Tibet, initially determined in ITRF97, were expressed in ITRF2000. After analysing previous studies by different authors, we determined the pole of rotation of the Indian tectonic plate to be located in ITRF2000 at 51.409±1.560° N and −10.915±5.556°E, with an angular velocity of 0.483±0.015°. Myr−1. Internal deformation of India is found to be small, corresponding to less than about 2 mm yr−1 of baseline change between Southern India and the Himalayan piedmont. Based on an elastic dislocation model of interseismic strain and taking into account the uncertainty on India plate motion, the mean convergence rate across Central and Eastern Nepal is estimated to 19±2.5 mm yr−1, (at the 67% confidence level). The main himalayan thrust (MHT) fault was found to be locked from the surface to a depth of about 20 km over a width of about 115 km. In these regions, the model parameters are well constrained, thanks to the long and continuous time-series from the permanent GPS as well as DORIS data. Further west, a convergence rate of 13.4±5 mm yr−1, as well as a fault zone, locked over 150 km, are proposed. The slight discrepancy between the geologically estimated deformation rate of 21±1.5 mm yr−1 and the 19±2.5 mm yr−1 geodetic rate in Central and Eastern Nepal, as well as the lower geodetic rate in Western Nepal compared to Eastern Nepal, places bounds on possible temporal variations of the pattern and rate of strain in the period between large earthquakes in this region. Numéro de notice : A2006-673 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0030-3 Date de publication en ligne : 08/03/2006 En ligne : https://doi.org/10.1007/s00190-006-0030-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102742
in Journal of geodesy > vol 80 n° 8-11 (November 2006) . - pp 567 - 589[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 266-06102 RAB Revue Centre de documentation En réserve L003 Disponible 266-06101 RAB Revue Centre de documentation En réserve L003 Disponible Mapping damage in the Jammu and Kashmir caused by 8 October 2005 mw 7.3 earthquakes from the Cartosat-1 and Resourcesat-1 imagery / K. Vinod Kumar in International Journal of Remote Sensing IJRS, vol 27 n°18 - 19 - 20 (October 2006)PermalinkUtilisation d'un SIG pour le calcul de l'indice de symétrie des bassins-versants : un outil de diagnostic de la croissance des rides anticlinales : exemple du pli de Chandigarh (Siwalik, Inde, Himalaya) / J.M. Carozza in Photo interprétation, vol 42 n° 2 (Juin 2006)PermalinkGIS-based route planning in landslide-prone areas / A.K. Saha in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)PermalinkAn integrated approach for landslide susceptibility mapping using remote sensing and GIS / S. Sarkar in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 5 (May 2004)PermalinkAn artificial neural network approach for landslide hazard zonation in the Bhagirathi (Ganga) Valley, Himalayas / M.K. Arora in International Journal of Remote Sensing IJRS, vol 25 n° 3 (February 2004)PermalinkHigh-resolution 3D modelling and visualization of Mount Everest / Armin W. Gruen in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 1-2 (November - December 2002)PermalinkSpot panchromatic imagery and neural networks for information extraction in a complex mountain environment / M.P. Bishop in Geocarto international, vol 14 n° 2 (June - August 1999)PermalinkEverest : moins 2 mètres / B. Chamoux (1993)PermalinkTerrestrial photogrammetric mapping of the Nehnar glacier in Himalaya, India / N.K. Agarwal in ISPRS Journal of photogrammetry and remote sensing, vol 44 n° 4 (December 1989)PermalinkLa mission photogrammétrique Spacelab-1 / Gottfried Konecny in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 99 (Juillet 1985)Permalink