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Flexible dataset combination and modelling by domain decomposition approaches / Isabelle Panet (2012)
Titre : Flexible dataset combination and modelling by domain decomposition approaches Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; Yuki Kuroishi, Auteur ; Matthias Holschneider, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 137 Projets : 2-Pas d'info accessible - article non ouvert / Conférence : IAG 2009, 7th Hotine-Marussi Symposium on Mathematical Geodesy 06/06/2009 10/06/2009 Rome Italie Proceedings Springer Importance : pp 67 - 73 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] compensation par moindres carrés
[Termes IGN] erreur systématique
[Termes IGN] filtrage du bruit
[Termes IGN] Japon
[Termes IGN] modèle de géopotentiel
[Termes IGN] modèle de géopotentiel local
[Termes IGN] ondelette
[Termes IGN] ondelette d'Abel-Poisson
[Termes IGN] transformation en ondelettesRésumé : (auteur) For geodetic and geophysical purposes, such as geoid determination or the study of the Earth’s structure, heterogeneous gravity datasets of various origins need to be combined over an area of interest, in order to derive a local gravity model at the highest possible resolution. The quality of the obtained gravity model strongly depends on the use of appropriate noise models for the different datasets in the combination process. In addition to random errors, those datasets are indeed often affected by systematic biases and correlated errors. Here we show how wavelets can be used to realize such combination in a flexible and economic way, and how the use of domain decomposition approaches allows to recalibrate the noise models in different wavebands and for different areas. We represent the gravity potential as a linear combination of Poisson multipole wavelets (Holschneider et al. 2003). We compute the wavelet model of the gravity field by regularized least-squares adjustment of the datasets. To solve the normal system, we apply the Schwarz iterative algorithms, based on a domain decomposition of the models space. Hierarchical scale subdomains are defined as subsets of wavelets at different scales, and for each scale, block subdomains are defined based on spatial splittings of the area. In the computation process, the data weights can be refined for each subdomain, allowing to take into account the effect of correlated noises in a simple way. Similarly, the weight of the regularization can be recalibrated for each subdomain, introducing non-stationarity in the a priori assumption of smoothness of the gravity field. We show and discuss examples of application of this method for regional gravity field modelling over a test area in Japan. Numéro de notice : C2009-035 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-22078-4_10 Date de publication en ligne : 18/11/2011 En ligne : https://doi.org/10.1007/978-3-642-22078-4_10 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91642 A general formula for calculating meridian arc length and its application to coordinate conversion in the Gauss-Krüger projection / K. Kawase in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)
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Titre : A general formula for calculating meridian arc length and its application to coordinate conversion in the Gauss-Krüger projection Type de document : Article/Communication Auteurs : K. Kawase, Auteur Année de publication : 2011 Article en page(s) : pp 1 - 13 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections
[Termes IGN] arc de méridien
[Termes IGN] Japon
[Termes IGN] projection Universal Transverse Mercator
[Termes IGN] système de coordonnées
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) The meridian arc length from the equator to arbitrary latitude is of utmost importance in map projection, particularly in the Gauss-Krüger projection. In Japan, the previously used formula for the meridian arc length was a power series with respect to the first eccentricity squared of the earth ellipsoid, despite the fact that a more concise expansion using the third flattening of the earth ellipsoid has been derived. One of the reasons that this more concise formula has rarely been recognized in Japan is that its derivation is difficult to understand. This paper shows an explicit derivation of a general formula in the form of a power series with respect to the third flattening of the earth ellipsoid. Since the derived formula is suitable for implementation as a computer program, it has been applied to the calculation of coordinate conversion in the Gauss-Krüger projection for trial. Numéro de notice : A2011-550 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000062452.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31444
in Bulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 1 - 13[article]Revision of survey results of control points after the 2011 off the Pacific coast of Tohoku earthquake / Y. Hiyama in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)
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Titre : Revision of survey results of control points after the 2011 off the Pacific coast of Tohoku earthquake Type de document : Article/Communication Auteurs : Y. Hiyama, Auteur ; T. Kawahara, Auteur ; M. Iwata, Auteur Année de publication : 2011 Article en page(s) : pp 31 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] erreur de positionnement
[Termes IGN] GeoNet
[Termes IGN] Japon
[Termes IGN] point d'appui
[Termes IGN] positionnement par GPS
[Termes IGN] révision des données
[Termes IGN] séisme
[Termes IGN] station GPSRésumé : (Auteur) Large-scale crustal deformation over a wide area of eastern Japan was detected by GEONET, Japan's dense Global Positioning System (GPS) network, following the 2011 off the Pacific coast of Tohoku Earthquake occurred on March 11, 2011. Since it was assumed that coordinates of the control points for public surveys, such as GEONET stations, triangulation stations and leveling bench marks, in a wide area were greatly changed and could hardly maintain consistency between nearby stations, the Geospatial Information Authority of Japan (GSI) stopped providing ‘Survey Results’ of them, which were the coordinates for survey use, and announced it publicly on March 14, 2011. In order to promote various public restoration programs in the affected area, it was strongly required to revise the Survey Results in an urgent manner. On the other hand, because large postseismic deformation had continued widely after the event, it was concerned that even if the Survey Results were updated immediately, they would become ineffective in a short time. Therefore GSI examined the optimal timing to calculate their new coordinates by predicting the amount of future postseismic movement based on the observation data of GEONET stations. Eventually, the new Survey Results of GEONET stations were published on May 31, 2011 and those of triangulation stations and leveling bench marks on October 31, 2011 respectively. In this paper, we report the revision process of the Survey Results after the 2011 Tohoku Earthquake. Numéro de notice : A2011-552 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000065835.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31446
in Bulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 31 - 42[article]The crustal deformation and fault model of the 2011 off the Pacific coast of Tohoku earthquake / T. Imakiire in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)
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Titre : The crustal deformation and fault model of the 2011 off the Pacific coast of Tohoku earthquake Type de document : Article/Communication Auteurs : T. Imakiire, Auteur ; T. Kobayashi, Auteur Année de publication : 2011 Article en page(s) : pp 21 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] déformation de la croute terrestre
[Termes IGN] faille géologique
[Termes IGN] Geonetwork
[Termes IGN] image ALOS-PALSAR
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] séisme
[Termes IGN] Tohoku (Japon)Résumé : (Auteur) This paper presents an overview of crustal deformation caused by the 2011 off the Pacific coast of Tohoku Earthquake, detected by GEONET (GPS Earth Observation Network), the GPS continuous observation system operated by the GSI, and by interferometric SAR (InSAR) analysis using ALOS/PALSAR data. We found that a very wide area of the Japanese Islands, from Hokakido to the Kinki district, was remarkably affected by the crustal deformation caused by the mainshock of the Tohoku Earthquake. We estimated the geometry of the seismogenic fault of the earthquake, as well as the slip model for the plate boundary between the Pacific plate and the North American plate, from the crustal deformation data obtained from GEONET. The fault is estimated to be longer than 400 km, stretching from off Iwate Prefecture in the north to off Ibaraki Prefecture in the south. The largest slip estimate for the plate boundary is more than 56 m in the off-Miyagi region near the Japan Trench. Postseismic crustal deformation is also observed by GEONET, indicating that slow postseismic slip is ongoing along the plate boundary around the main fault zone. Additionally, we detected clear coseismic signals associated with induced inland earthquakes in the Fukushima-Hamadori area from InSAR analysis. The InSAR results show obvious displacement discontinuities, suggesting that rather shallow ruptures occurred. In particular, for the Mj 7.0 event on April 11, the observed displacement boundaries correspond to earthquake surface ruptures that appeared just along the Idosawa and Yunotake faults. Numéro de notice : A2011-551 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000065834.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31445
in Bulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 21 - 30[article]An ontology-based approach to incorporate user-generated geo-content into SDI / D.P. Deng (20/10/2011)
Titre : An ontology-based approach to incorporate user-generated geo-content into SDI Type de document : Article/Communication Auteurs : D.P. Deng, Auteur ; Robert Lemmens, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 20/10/2011 Conférence : ISPRS 2011, WG IV/1, IV/2, IV/4, IV/5, WG IV/7, ICWG IV/VIII Geospatial Data Infrastructure: from data acquisition and updating to smarter services 20/10/2011 21/10/2011 Guilin Chine OA ISPRS Archives Importance : 6 p. ; pp 38 - 43 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] catastrophe naturelle
[Termes IGN] contenu généré par les utilisateurs
[Termes IGN] données issues des réseaux sociaux
[Termes IGN] exploration de données
[Termes IGN] hétérogénéité sémantique
[Termes IGN] Japon
[Termes IGN] ontologie
[Termes IGN] trace numériqueRésumé : (Auteur) The Web is changing the way people share and communicate information because of emergence of various Web technologies, which enable people to contribute information on the Web. User-Generated Geo-Content (UGGC) is a potential resource of geographic information. Due to the different production methods, UGGC often cannot fit in geographic information model. There is a semantic gap between UGGC and formal geographic information. To integrate UGGC into geographic information, this study conducts an ontology-based process to bridge this semantic gap. This ontology-based process includes five steps: Collection, Extraction, Formalization, Mapping, and Deployment. In addition, this study implements this process on Twitter messages, which is relevant to Japan Earthquake disaster. By using this process, we extract disaster relief information from Twitter messages, and develop a knowledge base for GeoSPARQL queries in disaster relief information. Numéro de notice : C2011-055 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication DOI : 10.5194/isprsarchives-XXXVIII-4-W25-38-2011 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXVIII-4-W25-38-2011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64360 Monitoring Japan's triple disasters from space / Anonyme in GEO: Geoconnexion international, vol 10 n° 5 (may 2011)PermalinkReprésentations en ondelettes du champ de pesanteur / Isabelle Panet in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkWavelet modelling of the gravity field by domain decomposition methods: an example over Japan / Isabelle Panet in Geophysical journal international, vol 184 n° 1 (January 2011)PermalinkOn improving precision of GPS-derived height times series at GEONET stations / H. Munekane in Bulletin of the GeoSpatial Information authority of Japan, vol 58 (December 2010)PermalinkA pre-screened and normalized multiple endmember spectral mixture analysis [MESMA] for mapping impervious surface area in Lake Kasumigaura Basin, Japan / F. Yang in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 5 (September - October 2010)PermalinkAnalysis of the spatial relations among point distributions on a discrete space / Yukio Sadahiro in International journal of geographical information science IJGIS, vol 24 n°7-8 (july 2010)PermalinkAsymmetric tropospheric delays from numerical weather models for UT1 determination from VLBI Intensive sessions on the baseline Wettzell–Tsukuba / Johannes Böhm in Journal of geodesy, vol 84 n° 5 (May 2010)PermalinkWavelet modeling of the gravity field over Japan / Isabelle Panet in Bulletin of the Geographical survey institute, vol 57 (December 2009)PermalinkWebGIS for evaluating walkability environment in urban center of Tsukuba / R. Thapa in Tsukuba geoenvironmental sciences, vol 5 (01/12/2009)PermalinkA new algorithm for distance cartogram construction / E. Shimizu in International journal of geographical information science IJGIS, vol 23 n°11-12 (november 2009)Permalink