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Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D / Emilie Le Hir in Journal of The Remote Sensing Society of Japan, vol 32 n° 1 (January 2012)
[article]
Titre : Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D Type de document : Article/Communication Auteurs : Emilie Le Hir, Auteur ; Laurent Cunin , Auteur ; Marc Bernard, Auteur Année de publication : 2012 Article en page(s) : pp 15 - 21 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données ICEsat
[Termes IGN] image SPOT 5
[Termes IGN] image SPOT-HRG
[Termes IGN] modèle numérique de surface
[Termes IGN] point d'appui
[Termes IGN] Référence-3DRésumé : (auteur) Onboard SPOT 5, the HRS instrument systematically collects 600 km × 120 km stereopairs around the Globe since 2002. From this time, SPOT5 stereoscopic imagery becomes one of main satellite data sources for accurate DTED level 2 DEM extraction. Spot Image and French National Cartographic Institute (IGN) decided in 2002 to build a worldwide accurate database called Reference3DTM using HRS data. Huge eorts have been made to standardize the process in order to oer aordable prices. Until 2008, the targeted accuracies were 16 mCE90 for horizontal accuracy, and 10 mLE90 for vertical accuracy. These accuracy requirements were achieved without any control points nor map support. The introduction of the paper briey reminds the most signicant assessments performed by major players within the geospatial community, and more specically the one by ImageONE Co., Ltd. (Tokyo) on two Reference3D geocells over the Northern coast of Japan, Hokkaido province. This work was published in 2008 during the last Beijing ISPRS congress. In 2009, it was decided to introduce reliable GCPs within the Reference3D production process, to increase the horizontal accuracy down to 6-10 mCE90. In addition, two new layers were added to the product, which provide the user with i) the horizontal accuracy for every single pixel of the Reference3D orthoimage and ii) the vertical accuracy for every single elevation value within the Reference3D DEM. The paper shows how the extensive use of ICESat data brings valuable information regarding the eective vertical accuracy, and how ICESat data allows to quantify the elevation accuracy of a dataset. In conclusion, we present the road map for the update of the whole Reference3D database, which currently spreads over more than 45 millions of sq. km. (being more than 4,200 1° by 1° geocells), already funded and started up to 2014, towards 80 Mkm2 of Reference3D products. Numéro de notice : A2012-746 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.11440/rssj.32.15 Date de publication en ligne : 30/01/2012 En ligne : https://doi.org/10.11440/rssj.32.15 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91732
in Journal of The Remote Sensing Society of Japan > vol 32 n° 1 (January 2012) . - pp 15 - 21[article]Documents numériques
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Updating and improving the accuracy ... - pdf éditeurAdobe Acrobat PDF 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)
[article]
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]Automatic georeferencing of aerial images using stereo high-resolution satellite images / J. Oh in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 11 (November 2011)
[article]
Titre : Automatic georeferencing of aerial images using stereo high-resolution satellite images Type de document : Article/Communication Auteurs : J. Oh, Auteur ; K. Toth, Auteur ; A. Grejner-Brzezinska, Auteur Année de publication : 2011 Article en page(s) : pp 1157 - 1168 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] compensation par faisceaux
[Termes IGN] erreur de positionnement
[Termes IGN] géoréférencement indirect
[Termes IGN] image à haute résolution
[Termes IGN] image aérienne
[Termes IGN] image Ikonos
[Termes IGN] point d'appui
[Termes IGN] Ransac (algorithme)
[Termes IGN] SIFT (algorithme)
[Termes IGN] valeur aberranteRésumé : (Auteur) For airborne surveys, the GPS/INS system has become the primary source for aerial image georeferencing. However, alternative automated georeferencing is required to serve as a backup for georeferencing when GPS/iNS-based georeferencing is not feasible. High-resolution satellite images (HRSl) have been globally available with better spatial resolution and increasing positional accuracy. Therefore, hrsi has high potential as a ground control source for aerial image georeferencing which usually requires accurate 3D ground control points. Unfortunately, single imagery, which is often used as a reference, contains relief displacement due to objects on the ground introducing positional errors, unless it is not true orthorectified which is costly and time consuming. Therefore, in this study, a stereo HRSI-based automated georeferencing approach is proposed. The use of stereo images can avoid the impact of relief displacement and requires no external height information. The proposed method is based on a multi-scale image matching approach utilizing a combination of SIFT (Scale-Invariant Feature Transform) and ransac (RANdom SAmple Consensus). In the georeferencing step, the bundle adjustment with outlier removal of Baarda's data snooping was utilized. Experimental results for a strip of aerial images with stereo Ikonos images showed its potential as a backup system for automated georeferencing. Numéro de notice : A2011-449 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.11.1157 En ligne : https://doi.org/10.14358/PERS.77.11.1157 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31227
in Photogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 11 (November 2011) . - pp 1157 - 1168[article]Giving the ‘right’ route directions : the requirements for pedestrian navigation systems / C. Schroder in Transactions in GIS, vol 15 n° 3 (July 2011)
[article]
Titre : Giving the ‘right’ route directions : the requirements for pedestrian navigation systems Type de document : Article/Communication Auteurs : C. Schroder, Auteur ; B. Gittings, Auteur ; William A Mackaness, Auteur Année de publication : 2011 Article en page(s) : pp 419 - 438 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] classification
[Termes IGN] détection automatique
[Termes IGN] itinéraire
[Termes IGN] milieu urbain
[Termes IGN] navigation pédestre
[Termes IGN] point d'intérêt
[Termes IGN] point de repèreRésumé : (Auteur) It is more natural and effective to include a variety of landmarks when providing route directions. Many of the existing solutions, however, behave like car navigation systems and do not include references to such landmarks. This research provides empirical evidence to identify the information requirements for an automated pedestrian navigation system. The two experiments discussed within this article helped identify the criteria that govern the relative saliency of features of interest within an urban environment. There are a large variety of features of interest that can be used as directional aids within route descriptions (buildings, statues, monuments, hills, roads, etc). Different measures are therefore required in order to calculate the saliency of the different classes of features. The research revealed that the most important measures of saliency include name, size, age, and colour. The research confirmed that that relative visibility and the direction of approach to the feature also affect a landmark's saliency. The research also highlighted the role that features of interest play in reorientation, confirmatory, and direction-giving tasks. Numéro de notice : A2011-227 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01266.x Date de publication en ligne : 06/06/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01266.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31005
in Transactions in GIS > vol 15 n° 3 (July 2011) . - pp 419 - 438[article]Georeferencing performance of THEOS satellite imagery / S. Liu in Photogrammetric record, vol 26 n° 134 (June - August 2011)
[article]
Titre : Georeferencing performance of THEOS satellite imagery Type de document : Article/Communication Auteurs : S. Liu, Auteur ; Clive Simpson Fraser, Auteur ; C. Zhang, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 250 - 262 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] géoréférencement direct
[Termes IGN] image à très haute résolution
[Termes IGN] image Theos
[Termes IGN] ligne de visée
[Termes IGN] Melbourne
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] orientation du capteur
[Termes IGN] point d'appui
[Termes IGN] THEOSRésumé : (Auteur) This paper reports on the application of a generic physical sensor orientation model for evaluation of the georeferencing performance of 2 m resolution imagery from the Thailand Earth Observation System (THEOS) satellite. Within the generic sensor orientation model, orbit and attitude data are employed to describe the satellite trajectory, which is further modelled by splines. The satellite orbit and sensor attitude errors are then compensated via sensor orientation adjustment using a modest number of ground control points (GCPs), resulting in improved georeferencing. The generic sensor model and the integration of the THEOS orientation parameters into the model are first described. The presence of errors in the satellite line-of-sight data, which result in imprecise sensor interior orientation are then discussed. Such errors can be effectively accounted for through modelling via a cubic polynomial, leading to sub-pixel georeferencing accuracy. An account is then given of an experimental evaluation of THEOS georeferencing conducted in a well-established testfield near Melbourne, Australia. The results demonstrate that sub-pixel 2D geopositioning accuracy is readily achievable with single THEOS images and within strips of up to three images, with as few as six GCPs to effect an orbit adjustment. However, accuracy decreases to near the 2-pixel level over a strip length of five images. Numéro de notice : A2011-243 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00634.x Date de publication en ligne : 06/06/2011 En ligne : https://doi.org/10.1111/j.1477-9730.2011.00634.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31021
in Photogrammetric record > vol 26 n° 134 (June - August 2011) . - pp 250 - 262[article]Réservation
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