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The future of disaster response management / Krista Montgomery in GEO: Geoconnexion international, vol 15 n° 1 (January 2016)
[article]
Titre : The future of disaster response management Type de document : Article/Communication Auteurs : Krista Montgomery, Auteur Année de publication : 2016 Article en page(s) : pp 30 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition de données
[Termes IGN] données localisées numériques
[Termes IGN] drone
[Termes IGN] Népal
[Termes IGN] risque naturel
[Termes IGN] séismeRésumé : (éditeur) Kathmandu university recently taught UAV-mapping applications for emergency response and disaster management to help with the recent earthquakes in Nepal, reports Krista Montgomery. Numéro de notice : A2016-005 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79153
in GEO: Geoconnexion international > vol 15 n° 1 (January 2016) . - pp 30 - 31[article]
Titre : Theoretical and practical aspects of high-rate GNSS geodetic observations Type de document : Thèse/HDR Auteurs : Simon Häberling, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2016 Autre Editeur : Zurich : Eidgenossische Technische Hochschule ETH - Ecole Polytechnique Fédérale de Zurich EPFZ Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 95 Importance : 212 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-41-3 Note générale : bibliographie
thesis submitted to attain the degree of doctor of sciences of ETH ZurichLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] bruit thermique
[Termes IGN] erreur de positionnement
[Termes IGN] filtrage du signal
[Termes IGN] fréquence
[Termes IGN] onde sismique
[Termes IGN] phase
[Termes IGN] source d'erreurIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (auteur) The main goal of the thesis is the thorough investigation and quantification of GNSS observation errors in the frequency range above 1 Hz while going to the limit of the actual receiver technology with sampling rates up to 100 sps. The potential GNSS errors in this high-frequency band are mainly caused by receiver internal error sources. Due to theoretical considerations and empirical results derived from GNSS observations of almost all available carrier signals, the carrier jitter induced by thermal noise and the receiver frequency response produced by highly dynamic motions could be detected as the two most dominant disturbances affecting high-rate GNSS observations above 1 Hz.
The zero-baseline configuration (splitting the signal from one antenna to two receivers) allowed a detailed study of the carrier phase jitter and correlations between subsequent epochs dependent on different GNSS signal characteristics and baseband parameters. The size of the carrier phase jitter is directly determined by the carrier-to-noise density ratio at baseband and the corresponding loop bandwidth. Especially encrypted code sequences have a strong influence on the quality of the corresponding carrier phase component due to signal strength consuming decryption algorithms. The final consequences are a higher carrier jitter and a stronger frequency response due to the necessary PLL guiding by the strong loop signals such as GPS L1 derived from the C/A component. The impact of this higher carrier phase jitter plays a dominant role for the overall noise in the highfrequency spectrum while building the ionosphere-free linear combination. This has been demonstrated using a zero-baseline, but also a 10 m and 110 km baseline. The carrier phase jitter induced by thermal noise defines the noise level above 1 Hz. This high-frequency noise is therefore baseline independent. No significant differences between a baseline of 10 m and 110 km could be detected considering the signal spectrum between 0.01 Hz and 50 Hz.
For the determination and analysis of the GNSS errors caused by high-frequency motions an experimental setup has been established consisting of a single-axis shake table as motion generator and of a well-known ground-truth defined by inductive displacement transducers. The ground-truth was validated by a strong motion seismometer with a flat frequency response carried on the shake table. With an additional precise time synchronization between all the sensors, the experiment with a mounted GNSS antenna on the shake table enabled the determination of the GNSS receiver frequency response between 1 and 20 Hz. Using different receiver types and PLL bandwidths, the amplitudes even at 3 Hz can be overestimated by about 50%, above 10 Hz also an overestimation can be observed or a reduction by well over half of the amplitude. Not only the amplitude is affected, but also the signal phase with errors between 30 and 90 degrees. This demonstrates the importance of a detailed knowledge of the loop parameters for an assessment of the expected errors, but also for applying an inverse filter in order to correct the GNSS receiver frequency response based on a simple digital PLL model. These results are relevant for all applications with strong dynamics using high-rate GNSS, such as structural health monitoring, machine guidance, navigation, and ionosphere scintillation studies.
Further, seismological implications and the potential contribution of high-rate GNSS to seismology has been evaluated. Based on a moderate synthetic earthquake expected for Switzerland generated on the shake table, the sensitivity of high-rate GPS to highfrequency seismic signals using a realistic baseline length could be tested. Additionally, the receiver response has been simulated for real earthquakes in order to demonstrate the displacement errors caused by the response.Note de contenu : 1- Introduction
2- GNSS Signal Structure
3- GNSS Receiver Architecture
4- Carrier Tracking Modeling
5- Analysis of the GNSS Signal Noise
6- Shake Table Experiments
7- GNSS Receiver Response
8- Implications on Seismology and other Applications
9- Conclusions and OutlookNuméro de notice : 17461 Affiliation des auteurs : non IGN Autre URL associée : https://doi.org/10.3929/ethz-a-010592866 Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : thèse : Sciences : ETHZ : 2015 DOI : 10.3929/ethz-a-010592866 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-95.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89687 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17461-01 30.61 Livre Centre de documentation Géodésie Disponible Inelastic surface deformation during the 2013 Mw 7.7 Balochistan, Pakistan, earthquake / A. Vallage in Geology, vol 43 n° 12 (December 2015)
[article]
Titre : Inelastic surface deformation during the 2013 Mw 7.7 Balochistan, Pakistan, earthquake Type de document : Article/Communication Auteurs : A. Vallage, Auteur ; Yann Klinger, Auteur ; R. Grandin, Auteur ; H.S. Bhat, Auteur ; Marc Pierrot-Deseilligny , Auteur Année de publication : 2015 Article en page(s) : pp 1079 - 1082 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] déformation de la croute terrestre
[Termes IGN] faille géologique
[Termes IGN] image optique
[Termes IGN] image radar
[Termes IGN] image satellite
[Termes IGN] Pakistan
[Termes IGN] séismeRésumé : (auteur) Comprehensive quantification of the near-field deformation associated with an earthquake is difficult due to the inherent complexity of surface ruptures. The A.D. 2013 Mw 7.7 Balochistan (Pakistan) earthquake, dominated by left-lateral motion with some reverse component, ruptured a 200-km-long section of the Hoshab fault. We characterize the coseismic rupture in detail along its entire length. Optical and radar satellite images are combined to derive the full three-dimensional far-field displacement (115 m pixel size) and the high-resolution 2.5 m pixel horizontal displacement field resulting from the earthquake. We show that the vertical deformation is significant in several locations. The high-resolution near-field horizontal displacement ( Numéro de notice : A2015--113 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1130/G37290.1 Date de publication en ligne : 14/10/2015 En ligne : https://doi.org/10.1130/G37290.1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90651
in Geology > vol 43 n° 12 (December 2015) . - pp 1079 - 1082[article]GPS and the 2015 Gorkha Earthquake / Mathias Lemmens in GIM international [en ligne], vol 29 n° 11 (November 2015)
[article]
Titre : GPS and the 2015 Gorkha Earthquake Type de document : Article/Communication Auteurs : Mathias Lemmens, Auteur Année de publication : 2015 Article en page(s) : pp 29 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] déformation de la croute terrestre
[Termes IGN] Himalaya
[Termes IGN] positionnement par GPS
[Termes IGN] réseau de surveillance géophysique
[Termes IGN] réseau géodésique
[Termes IGN] séismeRésumé : (auteur) Nepal is prone to earthquakes and throughout the centuries the country's capital city, Kathmandu, has been regularly struck by earthquakes which appear to have similar epicentres and behaviour. The portion of the Main Himalayan Thrust ruptured by the 2015 Gorkha earthquake lies directly beneath a network of GPS continuously operating reference stations (CORS) recording three-dimensional positions at a high rate of 5 samples per second (5Hz). This is the first time a large continental thrust earthquake has been measured by a 5Hz GPS network with receivers on both sides of the fault rupture. Numéro de notice : A2015-734 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78423
in GIM international [en ligne] > vol 29 n° 11 (November 2015) . - pp 29 - 31[article]Caring and sharing by crowdsourcing / Alister Clark in Position, n° 79 (October - November 2015)
[article]
Titre : Caring and sharing by crowdsourcing Type de document : Article/Communication Auteurs : Alister Clark, Auteur Année de publication : 2015 Article en page(s) : pp 16 - 16 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Société de l'information
[Termes IGN] catastrophe naturelle
[Termes IGN] contenu généré par les utilisateurs
[Termes IGN] données localisées des bénévoles
[Termes IGN] Népal
[Termes IGN] secours d'urgence
[Termes IGN] séismeRésumé : (éditeur) The disaster relief for the Nepalese Earthquakes has been enhanced through crowdsourcing sites such as Tomnod and Quakemap. This makes the caring and sharing have deeeper ramifications Numéro de notice : A2015-787 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78917
in Position > n° 79 (October - November 2015) . - pp 16 - 16[article]Monitoring landslide displacements with the Geocube wireless network of low-cost GPS / Lionel Benoit in Engineering Geology, vol 195 (September 2015)PermalinkWeb services for dynamic coloring of UAVSAR images / Jun Wang in Pure and applied geophysics, vol 172 n° 8 (August 2015)PermalinkA multicriteria spatial decision support system for solving emergency service station location problems / Majid Esmaelian in International journal of geographical information science IJGIS, vol 29 n° 7 (July 2015)PermalinkPhotogrammétrie et tout le reste / Anonyme in Géomatique expert, n° 104 (mai - juin 2015)PermalinkIntegrating SAR and derived products into operational volcano monitoring and decision support systems / Franz J. Meyer in ISPRS Journal of photogrammetry and remote sensing, vol 100 (February 2015)PermalinkLaser scanning-based detection of morphological changes of a historical building occurred during a seismic sequence: Method and case study / Arianna Pesci in International Journal of Geomatics and Geosciences, vol 5 n° 3 (February 2015)PermalinkMeasurement of ground displacement from optical satellite image correlation using the free open-source software MicMac / Ana-Maria Rosu in ISPRS Journal of photogrammetry and remote sensing, vol 100 (February 2015)PermalinkReal-time high-precision earthquake monitoring using single-frequency GPS receivers / Min Li in GPS solutions, vol 19 n° 1 (January 2015)PermalinkApport des images Pléiades au microzonage sismique de Port-au-Prince (Haïti) : application à l'étude géologique / Monique Terrier in Revue Française de Photogrammétrie et de Télédétection, n° 209 (Janvier 2015)PermalinkExploitation de l'imagerie Pléiades en cartographie réactive suite à des catastrophes naturelles ayant affecté le territoire français en 2013 / Hervé Yésou in Revue Française de Photogrammétrie et de Télédétection, n° 209 (Janvier 2015)PermalinkRapport Quadriennal 2011-2015 [du] CNFGG [à la] 26e assemblée générale de l'Union Géodésique et Géophysique Internationale / Pierre Hubert (2015)PermalinkGlobal coseismic deformations, GNSS time series analysis, and earthquake scaling laws / Laurent Métivier in Journal of geophysical research : Solid Earth, vol 119 n° 12 (December 2014)PermalinkDetermination of periodic variations in sub-daily GPS positions of volcanic areas / Gözde Akay in Geomatica, vol 68 n° 2 (June 2014)PermalinkMapping the mass distribution of Earth's mantle using satellite-derived gravity gradients / Isabelle Panet in Nature geoscience, vol 7 n° 2 (February 2014)PermalinkMeasuring deformations using SAR interferometry and GPS observables with geodetic accuracy: Application to Tokyo, Japan / Tamer Elgarbawi in ISPRS Journal of photogrammetry and remote sensing, vol 88 (February 2014)PermalinkApports de l'imagerie et des SIG pour une étude morphostructurale de la jeffara tunisienne : implications géodynamiques et intérêts pétroliers / Rim Ghedhoui (2014)PermalinkAutomatic detection and correction of earthquakes and slow slip events in GNSS station time series / Clément Drouadaine (2014)PermalinkPermalinkComparaison de méthodes d'extraction automatique à partir d'images multispectrales / Valerio Baiocchi in Géomatique expert, n° 96 (01/01/2014)PermalinkPrise en compte des déformations co- et post-sismiques pour la détermination d'un repère de référence / Daphné Lercier (2014)Permalink