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The 2008 DGFI realization of the ITRS: DTRF2008 / Manuela Seitz in Journal of geodesy, vol 86 n° 12 (December 2012)
[article]
Titre : The 2008 DGFI realization of the ITRS: DTRF2008 Type de document : Article/Communication Auteurs : Manuela Seitz, Auteur ; Detlef Angermann, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1097 - 1123 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] Institut national de l'information géographique et forestière (France)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference System
[Termes IGN] station permanente
[Termes IGN] système de positionnement par satellitesRésumé : (Auteur) A new realization of the International Terrestrial System was computed at the ITRS Combination Centre at DGFI as a contribution to ITRF2008. The solution is labelled DTRF2008. In the same way as in the DGFI computation for ITRF2005 it is based on either normal equation systems or estimated parameters derived from VLBI, SLR, GPS and DORIS observations by weekly or session-wise processing. The parameter space of the ITRS realization comprises station positions and velocities and daily resolved Earth Orientation Parameters (EOP), whereby for the first time also nutation parameters are included. The advantage of starting from time series of input data is that the temporal behaviour of geophysical parameters can be investigated to decide whether the parameters can contribute to the datum realization of the ITRF. In the same way, a standardized analysis of station position time series can be performed to detect and remove discontinuities. The advantage of including EOP in the ITRS realization is twofold: (1) the combination of the coordinates of the terrestrial pole—estimated from all contributing techniques—links the technique networks in two components of the orientation, leading to an improvement of consistency of the Terrestrial Reference Frame (TRF) and (2) in their capacity as parameters common to all techniques, the terrestrial pole coordinates enhance the selection of local ties as they provide a measure for the consistency of the combined frame. The computation strategy of DGFI is based on the combination of normal equation systems while at the ITRS Combination Centre at IGN solutions are combined. The two independent ITRS realizations provide the possibility to assess the accuracy of ITRF by comparison of the two frames. The accuracy evaluation was done separately for the datum parameters (origin, orientation and scale) and the network geometry. The accuracy of the datum parameters, assessed from the comparison of DTRF2008 and ITRF2008, is between 2–5 mm and 0.1–0.8 mm/year depending on the technique. The network geometry (station positions and velocities) agrees within 3.2 mm and 1.0 mm/year. A comparison of DTRF2008 and ITRF2005 provides similar results for the datum parameters, but there are larger differences for the network geometry. The internal accuracy of DTRF2008—that means the level of conservation of datum information and network geometry within the combination—was derived from comparisons with the technique-only multi-year solutions. From this an internal accuracy of 0.32 mm for the VLBI up to 3.3 mm for the DORIS part of the network is found. The internal accuracy of velocities ranges from 0.05 mm/year for VLBI to 0.83 mm/year for DORIS. The internal consistency of DTRF2008 for orientation can be derived from the analysis of the terrestrial pole coordinates. It is estimated at 1.5–2.5 mm for the GPS, VLBI and SLR parts of the network. The consistency of these three and the DORIS network part is within 6.5 mm. Numéro de notice : A2012-650 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0567-2 Date de publication en ligne : 04/05/2012 En ligne : https://doi.org/10.1007/s00190-012-0567-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32096
in Journal of geodesy > vol 86 n° 12 (December 2012) . - pp 1097 - 1123[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012121 RAB Revue Centre de documentation En réserve L003 Disponible A 3-d laser scanning system and scan data processing method for the monitoring of tunnel deformations / K. Chmelina in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)
[article]
Titre : A 3-d laser scanning system and scan data processing method for the monitoring of tunnel deformations Type de document : Article/Communication Auteurs : K. Chmelina, Auteur ; J. Jansa, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 177 - 185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] auscultation d'ouvrage
[Termes IGN] Autriche
[Termes IGN] caméra numérique
[Termes IGN] données localisées 3D
[Termes IGN] lever mobile
[Termes IGN] Lidar
[Termes IGN] réalité virtuelle
[Termes IGN] surveillance d'ouvrage
[Termes IGN] système de numérisation mobile
[Termes IGN] tachéomètre électronique
[Termes IGN] télémètre laser terrestre
[Termes IGN] tunnel
[Termes IGN] visualisation 3DRésumé : (Auteur) The paper presents the mobile multi-sensor system Orthos Plus for the monitoring and mapping of tunnel walls, a scan data processing method for the evaluation of 3-d tunnel wall displacements from subsequent wall scans and, finally, a virtual reality tool supporting the interpretation of data. The measuring system consists of a 3-d laser scanner, a motorised total station and a digital camera that are integrated on a light metal frame that is installed on a mobile platform. It has been designed to perform tunnel measurements most efficiently and to meet the special requirements of tunnels under construction. The evaluation of 3-d displacements is based on a 3-d matching algorithm that takes advantage of the particular conditions of tunnel (shotcrete) surfaces. The virtual reality tool allows viewing of data in a 3-d virtual reality tunnel model and their animation in time and space in order supports understanding in an optimal way. The measuring system Orthos Plus has been developed in the course of a national research project, the 3-d matching method in the frame of the Austrian Christian Doppler Laboratory Spatial Data from Laser Scanning and Remote Sensing and the VR tool in the Austrian COMET K1 Competence Center VRVis Center (www.vrvis.at). Numéro de notice : A2012-597 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2012-0013 En ligne : http://www.degruyter.com/view/j/jag.2012.6.issue-3-4/jag-2012-0013/jag-2012-0013 [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32043
in Journal of applied geodesy > vol 6 n° 3-4 (November 2012) . - pp 177 - 185[article]3D coseismic displacement of 2010 Darfield, New Zealand earthquake estimated from multi-aperture InSAR and D-InSAR measurements / J. Hu in Journal of geodesy, vol 86 n° 11 (November 2012)
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Titre : 3D coseismic displacement of 2010 Darfield, New Zealand earthquake estimated from multi-aperture InSAR and D-InSAR measurements Type de document : Article/Communication Auteurs : J. Hu, Auteur ; X. Li, Auteur ; X. Ding, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1029 - 1041 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données localisées 3D
[Termes IGN] faille géologique
[Termes IGN] image ALOS-PALSAR
[Termes IGN] image radar moirée
[Termes IGN] interferométrie différentielle
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] Nouvelle-Zélande
[Termes IGN] propagation ionosphérique
[Termes IGN] séismeRésumé : (Auteur) Differential interferometric synthetic aperture radar (D-InSAR) measures ground deformation only along the line-of-sight (LOS) of the radar, which limits the capability of D-InSAR in investigating the surface damages and the focus mechanisms of earthquakes. We do a three-dimensional (3D) decomposition of the coseismic displacement of the Darfield, New Zealand earthquake that occurred on 3 September 2010 by exploiting the Multi-Aperture InSAR (MAI) and D-InSAR measurements from both ascending and descending L-band PALSAR data. Due to the dispersive nature of the ionosphere and the slight Doppler shift between the forward- and backward-looking interferograms, the ionospheric effects can be more serious in MAI measurements than in D-InSAR. We propose mitigating the ionospheric effects in the MAI processing with the directional filtering and interpolation procedure that has been applied in Offset-tracking. The rupture revealed by the 3D surface displacement fits closely to the Greendale fault, which is believed to be responsible for the earthquake. The horizontal ground motions, mostly eastwards in the hanging wall and westwards in the footwall, reached up to 2.5 m and are anti-symmetric with respect to the Greendale fault. Up to 2.5 m subsidence occurred in the hanging wall, while uplift is found in the footwall with an extreme case of 1.6 m in the far left of the fault. This makes us conclude that the Greendale fault is a normal and dextral strike-slip. It is seen that the MAI measurements are very helpful in the derivation of 3D coseismic displacement fields as it provides more accurate displacement estimation in the north–south direction. Numéro de notice : A2012-578 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0563-6 Date de publication en ligne : 20/04/2012 En ligne : https://doi.org/10.1007/s00190-012-0563-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32024
in Journal of geodesy > vol 86 n° 11 (November 2012) . - pp 1029 - 1041[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012111 RAB Revue Centre de documentation En réserve L003 Disponible Aerial image mosaicking with aid of vector roads / D. Wang in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)
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Titre : Aerial image mosaicking with aid of vector roads Type de document : Article/Communication Auteurs : D. Wang, Auteur ; Y. Wan, Auteur ; J. Xiao, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1141 - 1150 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] appariement de réseaux
[Termes IGN] chemin le moins coûteux, algorithme du
[Termes IGN] données vectorielles
[Termes IGN] image aérienne
[Termes IGN] mosaïquage d'images
[Termes IGN] réseau routier
[Termes IGN] squelettisationRésumé : (Auteur) This paper proposes a novel approach for using vector roads to aid in the generation of seamline networks for aerial image mosaicking. A representative seamline is extracted as follows. First, the straight skeleton of the overlapping area of adjacent images is extracted. Second, vector roads in the overlapping regions are overlaid with the extracted skeleton to build a weighted graph G (V, E). Dijkstra's algorithm is applied to find the lowest-cost path that connects two intersections of the polygons of two adjacent images. The lowest-cost path is considered as a seamline candidate. Finally, the seamline candidate is refined by considering its surrounding pixels. The refined seamline is employed as the final seamline. The resultant seamlines commonly follow the centerlines of roads as much as possible, and the mosaic image appears more seamless. Moreover, the vector-based approach is typically more efficient than the existing raster-based approaches: the vector-based approach is nearly ten times faster than a raster-based representative. Numéro de notice : A2012-582 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.11.1141 En ligne : https://doi.org/10.14358/PERS.78.11.1141 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32028
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 11 (November 2012) . - pp 1141 - 1150[article]Automatic generation of 2.5D terrain models without occluding routes of interest / Hao Deng in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)
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Titre : Automatic generation of 2.5D terrain models without occluding routes of interest Type de document : Article/Communication Auteurs : Hao Deng, Auteur ; L. Zhang, Auteur ; J. Ma, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1175 - 1185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] données localisées 2,5D
[Termes IGN] modèle numérique de terrain
[Termes IGN] montagne
[Termes IGN] réseau routier
[Termes IGN] visibilitéRésumé : (Auteur) When a car drives in mountainous regions, the views based on conventional perspective projection often suffer from features of interest being occluded. We propose a method for generating disocclusion views in mountainous regions. The terrain is segmented to build a potential set of occluders; and then an optimized viewpoint is determined, and elevations are rearranged. To obtain a smooth deformed terrain, a smooth displacement function is introduced to deform the level-of-detail terrain models. Compared with previous methods, the merit of this study lies in automatically generating disocclusion views with temporal coherence while keeping the details of the deformed terrain the same as the original terrain. Experiments performed on the 4098 pixel x 4098 pixel mountainous terrain landscape prove that the disocclusion views can achieve 42 to 58 frames/second. Moreover, the shapes of the features of interest on the driving route without occlusion and the spatial configuration of geographical landmarks in its neighborhood can be easily recognized. Numéro de notice : A2012-585 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.11.1175 En ligne : https://doi.org/10.14358/PERS.78.11.1175 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32031
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 11 (November 2012) . - pp 1175 - 1185[article]Edge-guided multiscale segmentation of satellite multispectral imagery / J. Chen in IEEE Transactions on geoscience and remote sensing, vol 50 n° 11 Tome 1 (November 2012)PermalinkFree classification of Canadian and American emergency management map symbol standards / Rachel A. Bianchetti in Cartographic journal (the), vol 49 n° 4 (November 2012)PermalinkIntegrating Landsat-7 imagery with physics-based models for quantitative mapping of coastal waters near river discharges / Nima Pahlevan in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)PermalinkLiDAR-Landsat data fusion for large-area assessment of urban land cover: Balancing spatial resolution, data volume and mapping accuracy / K. Singh in ISPRS Journal of photogrammetry and remote sensing, vol 74 (Novembrer 2012)PermalinkMapping nighttime flood from MODIS observations using support vector machines / R. Zhang in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)PermalinkMapping tropical forests and rubber plantations in complex landscapes by integrating PALSAR and MODIS imagery / J. Dong in ISPRS Journal of photogrammetry and remote sensing, vol 74 (Novembrer 2012)PermalinkMonitoring ground subsidence in Shanghai maglev area using two kinds of SAR data / J. Wu in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)PermalinkNavipedia, the GNSS Wiki: A reference for Global Navigation Satellite Systems / Teresa Ferreira in Inside GNSS, vol 7 n° 6 (November - December 2012)Permalinkvol 26 n° 11-12 - november - december 2012 - Second special issue on spatial ecology [Suivi de] Reflections on geographic information science : special issue in honor of Michael Goodchild (Bulletin de International journal of geographical information science IJGIS) / Laffan ShawnPermalinkStereopolis 2: A multi-purpose and multi-sensor 3D mobile mapping system for street visualisation and 3D metrology / Nicolas Paparoditis in Revue Française de Photogrammétrie et de Télédétection, n° 200 (Novembre 2012)Permalink