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High precision levelling supporting the International Comparison of Absolute Gravimeters / Z. Jiang in Metrologia, vol 49 n° 1 (February 2012)
[article]
Titre : High precision levelling supporting the International Comparison of Absolute Gravimeters Type de document : Article/Communication Auteurs : Z. Jiang, Auteur ; Matthias Becker, Auteur ; Philippe Jousset, Auteur ; Alain Coulomb , Auteur ; Pierre Boulanger, Auteur ; et al., Auteur Année de publication : 2012 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] gravimètre absoluRésumé : (auteur) High precision levelling is an indispensable method used to monitor benchmark and terrain stability at the Bureau International des Poids et Mesures (BIPM). Associated with the International Comparison of Absolute Gravimeters (ICAG), levelling measurements were carried out repeatedly over the past decades. A local gravity field strongly depends on vertical terrain deformation. 1 cm displacement implies about 2 µGal change in the vertical gravity acceleration. The precision of absolute and relative gravimetry nowadays is about 1 µGal.
At the beginning of the century, a strategy was outlined that the ICAG should be upgraded to a metrological Key Comparison of the CIPM MRA (Mutual Recognition Arrangement) recognized officially by the designated governmental organizations. As a result of this decision, BIPM site B was constructed and completed in Spring 2001. The site B pillar is 4 m × 6 m × 1.5 m in dimension and more than 80 ton in weight. Such a large, newly built concrete body produces local deformation due to its sinking or tilting. This in turn influences the local gravity field. Rigorous levelling measurements have been performed by the Bureau de Recherches Géologiques et Minières (BRGM), France, since 2001 and repeated together with the 4-year ICAGs of 2001, 2005 and 2009. ICAG-2009 was characterized by becoming the first Comité International des Poids et Mesures (CIPM) Key Comparison which supported meanwhile the BIPM watt balance (WB) project. The WB pillar was built in Spring 2009. The Institut Géographique National (IGN), France, has hence been invited to participate in the levelling. The latter also measured the link between the BIPM local network and external stations of the French national height reference system IGN69.
In this paper, we report the final results of the levelling programmes of 2001, 2005 and 2009 and compare the results. We investigate stability of the BIPM gravity-levelling stations. We conclude that the existing and the newly built stations can be considered as stable for the purposes of the ICAGs and the WB, although further repeat measurement may be required for the WB site.
For the first time, detailed and complete levelling data and results are published*. After 30 years of organizing and holding eight ICAGs, the BIPM will hand over the KC ICAG-2013 to another CIPM MRA designated institute. This paper serves as a technical and historical report of precision levelling, a sub-task of the ICAGs.Numéro de notice : A2012-703 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1088/0026-1394/49/1/007 Date de publication en ligne : 17/11/2011 En ligne : https://doi.org/10.1088/0026-1394/49/1/007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79601
in Metrologia > vol 49 n° 1 (February 2012)[article]A longitudinal study of malaria associated with deforestation in Sonitpur district of Assam, India / M. Nath in Geocarto international, vol 27 n° 1 (February 2012)
[article]
Titre : A longitudinal study of malaria associated with deforestation in Sonitpur district of Assam, India Type de document : Article/Communication Auteurs : M. Nath, Auteur ; A. Bora, Auteur ; P. Talukdar, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 79 - 88 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse diachronique
[Termes IGN] analyse spatio-temporelle
[Termes IGN] couvert forestier
[Termes IGN] déboisement
[Termes IGN] épidémie
[Termes IGN] forêt tropicale
[Termes IGN] Himalaya
[Termes IGN] image IRS
[Termes IGN] Inde
[Termes IGN] maladie parasitaire
[Termes IGN] Normalized Difference Vegetation IndexRésumé : (Auteur) Assam–Arunachal forest fringed foothill area is endemic for malaria incidence. The present study deals with the temporal analysis of malaria incidence and determines its association with deforestation in 24 villages along the Assam–Arunachal forest fringed foothill area of Sonitpur district of Assam. Malaria epidemiological survey has been carried out in the study area from the year 1994 to 2005. Remote sensing (RS) technique has been used to map the areas of forest changes from the year 2000 to 2005. Geographical information system (GIS) was used to map the malaria incidence and forest cover. The study villages are endemic to malaria infections and there was increasing trend of malaria incidence over the years. The slide positivity rate (SPR) ranged from 5.1% in 1997 to 44.4% in 2005. The percentage forest cover decreased significantly from 23.6% during 2000 to 15.4% during 2005, whereas SPR was increased during 2000–2005. The present study is the first attempt to understand the role of deforestation in malaria incidence using RS and GIS in the north-eastern region of India at a micro-geographic level. The study suggests that the area is endemic to malaria transmission. The decrease in forest cover is a serious ecological concern besides its role in elevating the malaria incidence in the study area. Numéro de notice : A2012-102 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2011.613485 Date de publication en ligne : 23/09/2011 En ligne : https://doi.org/10.1080/10106049.2011.613485 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31550
in Geocarto international > vol 27 n° 1 (February 2012) . - pp 79 - 88[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Markov Chain CFAR detection for polarimetric data using data fusion / C. Fei in IEEE Transactions on geoscience and remote sensing, vol 50 n° 2 (February 2012)
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Titre : Markov Chain CFAR detection for polarimetric data using data fusion Type de document : Article/Communication Auteurs : C. Fei, Auteur ; T. Liu, Auteur ; G. Lampropoulos, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 397 - 408 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] chaîne de Markov
[Termes IGN] données polarimétriques
[Termes IGN] fusion d'images
[Termes IGN] image radar moirée
[Termes IGN] image Radarsat
[Termes IGN] polarimétrie radarRésumé : (Auteur) This paper proposes a new Markov-chain-based constant false alarm rate (CFAR) detector for polarimetric data using low-level data fusion and high-level decision fusion. The Markov-chain-based CFAR detector extends traditional probability density function (pdf) based CFAR detection to first-order Markov chain model by considering both correlation between neighboring pixels and pdf information in CFAR detection. With the additional correlation information, the proposed approach results in advancing the performance of conventional CFAR detectors. Moreover, to take advantage of full polarizations of polarimetric data, various data fusion methods are considered to improve detection performance, including polarimetric transformation, principal component analysis, and decision fusion. Our experimental results confirm the superiority of the new Markov chain polarimetric CFAR detector over conventional pdf-based CFAR detectors. Numéro de notice : A2012-044 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2164257 Date de publication en ligne : 15/09/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2164257 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31492
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 2 (February 2012) . - pp 397 - 408[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012021 RAB Revue Centre de documentation En réserve L003 Disponible A nonlocal SAR image denoising algorithm based on LLMMSE wavelet shrinkage / S. Parrilli in IEEE Transactions on geoscience and remote sensing, vol 50 n° 2 (February 2012)
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Titre : A nonlocal SAR image denoising algorithm based on LLMMSE wavelet shrinkage Type de document : Article/Communication Auteurs : S. Parrilli, Auteur ; M. Poderico, Auteur ; C. Angelino, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 606 - 616 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] filtre de déchatoiement
[Termes IGN] filtre de Wiener
[Termes IGN] image radar moirée
[Termes IGN] transformation en ondelettesRésumé : (Auteur) We propose a novel despeckling algorithm for synthetic aperture radar (SAR) images based on the concepts of nonlocal filtering and wavelet-domain shrinkage. It follows the structure of the block-matching 3-D algorithm, recently proposed for additive white Gaussian noise denoising, but modifies its major processing steps in order to take into account the peculiarities of SAR images. A probabilistic similarity measure is used for the block-matching step, while the wavelet shrinkage is developed using an additive signal-dependent noise model and looking for the optimum local linear minimum-mean-square-error estimator in the wavelet domain. The proposed technique compares favorably w.r.t. several state-of-the-art reference techniques, with better results both in terms of signal-to-noise ratio (on simulated speckled images) and of perceived image quality. Numéro de notice : A2012-049 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2161586 Date de publication en ligne : 18/08/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2161586 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31497
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 2 (February 2012) . - pp 606 - 616[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012021 RAB Revue Centre de documentation En réserve L003 Disponible Les observatoires du trait de côte en France métropolitaine et dans les DOM / Serge Suanez in EchoGeo, n° 19 (janvier - mars 2012)
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Titre : Les observatoires du trait de côte en France métropolitaine et dans les DOM Type de document : Article/Communication Auteurs : Serge Suanez, Auteur ; Manuel Garcin, Auteur ; Thomas Bulteau, Auteur ; et al., Auteur Année de publication : 2012 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] interopérabilité
[Termes IGN] métadonnées géographiques
[Termes IGN] observatoire (Administration)
[Termes IGN] trait de côteNuméro de notice : A2012-695 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.4000/echogeo.12942 En ligne : https://doi.org/10.4000/echogeo.12942 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75466
in EchoGeo > n° 19 (janvier - mars 2012)[article]Producing an indigenous knowledge Web GIS for Arctic Alaska communities: Challenges, successes, and lessons learned / W. Eisner in Transactions in GIS, vol 16 n° 1 (February 2012)PermalinkAn evaluation of ontology matching in geo-service applications / L. Vaccari in Geoinformatica, vol 16 n° 1 (January 2012)PermalinkAntennas for Global Navigation Satellite Systems / Xiaodong Chen (2012)PermalinkAutomatic geospatial metadata generation for earth science virtual data products / P. Yue in Geoinformatica, vol 16 n° 1 (January 2012)PermalinkA genetic fuzzy-rule-based classifier for land cover classification from hyperspectral imagery / Dimitris G. Stavrakoudis in IEEE Transactions on geoscience and remote sensing, vol 50 n° 1 (January 2012)PermalinkIntegrating GI with non-GI services — showcasing interoperability in a heterogeneous service-oriented architecture / M. Treiblmayr in Geoinformatica, vol 16 n° 1 (January 2012)PermalinkJoint processing of Landsat and ALOS-PALSAR data for forest mapping and monitoring / E. Lehmann in IEEE Transactions on geoscience and remote sensing, vol 50 n° 1 (January 2012)PermalinkKnow your enemy: signal characteristics of civil GPS jammers / R. Mitch in GPS world, vol 23 n° 1 (January 2012)PermalinkLaplacian eigenmaps-based polarimetric dimensionality reduction for SAR image classification / S.T. Tu in IEEE Transactions on geoscience and remote sensing, vol 50 n° 1 (January 2012)PermalinkLong-term consecutive DInSAR for volume change estimation of land deformation / S. Sumantyo in IEEE Transactions on geoscience and remote sensing, vol 50 n° 1 (January 2012)Permalink