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Positional accuracy improvement using empirical analytic functions / C. Lopez-Vasquez in Cartography and Geographic Information Science, vol 39 n° 3 (July 2012)
[article]
Titre : Positional accuracy improvement using empirical analytic functions Type de document : Article/Communication Auteurs : C. Lopez-Vasquez, Auteur Année de publication : 2012 Article en page(s) : pp 133 - 139 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections
[Termes IGN] fonction analytique
[Termes IGN] point d'appui
[Termes IGN] positionnement par GNSS
[Termes IGN] précision du positionnement
[Termes IGN] projection conforme
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) We define as Positional Accuracy Improvement the problem of putting together maps A and B of the same area, with B of higher planimetric accuracy. To do so, all objects in A might have to be slightly moved according to a mathematical transformation. Such transformation might ideally be of a specific type, like analytical or conformal functions. We have developed a theory to find a suitable analytical transformation despite it is not well defined because the only data available is the displacement vectors at a limited number of homologue control points. There exists a similar problem in fluid mechanics devoted on estimating the complete velocity field given just values at a limited number of points. We borrowed some ideas from there and introduced them into the positional accuracy improvement problem. We shall demonstrate that it is possible to numerically estimate an analytic function that resembles the given displacement at control points. As a byproduct, an uncertainty estimation is produced, which might help to detect regions of different lineage. The theory has been applied to rural 1:50.000 cartography of Uruguay while trying to diminish the discrepancies against GNSS readings. After the analytic transformation, the RMSE error diminished from 116m to 48 m. Other problems with similar math requirements are the transformation between geodetic control networks. Numéro de notice : A2012-490 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1559/15230406393133 En ligne : https://doi.org/10.1559/15230406393133 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31936
in Cartography and Geographic Information Science > vol 39 n° 3 (July 2012) . - pp 133 - 139[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-2012031 RAB Revue Centre de documentation En réserve L003 Disponible Integrated point and edge matching on poor textural images constrained by self-adaptive triangulations / B. Wu in ISPRS Journal of photogrammetry and remote sensing, vol 68 (March 2012)
[article]
Titre : Integrated point and edge matching on poor textural images constrained by self-adaptive triangulations Type de document : Article/Communication Auteurs : B. Wu, Auteur ; Y. Zhang, Auteur ; Q. Zhu, Auteur Année de publication : 2012 Article en page(s) : pp 40 - 55 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] appariement d'images
[Termes IGN] détection de contours
[Termes IGN] point d'appui
[Termes IGN] reconstruction 3D
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) This paper presents an innovative image matching method for reliable and dense image matching on poor textural images, which is the integrated point and edge matching based on the self-adaptive edge-constrained triangulations. Firstly, several seed points and seed edges are obtained on the stereo images, and they are used to construct a pair of initial edge-constrained triangulations on the images. Then, points and edges are matched based on the triangle constraint and other constraints. The newly matched points and edges are inserted into the triangulations and the constrained triangulations are updated dynamically along with the matching propagation. The final results will be the final edge-constrained triangulations generated from the successfully matched points and edges. Experiments using typical space-borne, airborne, and terrestrial images with poor textures revealed that the integrated point and edge matching method based on self-adaptive triangulations is able to produce dense and reliable matching results. Moreover, from the final matched points and edges, 3D points and edges preserving the physical boundaries of objects can be further derived based on photogrammetric techniques, which is ideal for further object modeling applications. Numéro de notice : A2012-146 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.12.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.12.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31593
in ISPRS Journal of photogrammetry and remote sensing > vol 68 (March 2012) . - pp 40 - 55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2012021 SL Revue Centre de documentation Revues en salle Disponible
contenu dans Proceedings, Commission 1, XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia / M. Shortis (2012)
Titre : Toward a global bundle adjustment of SPOT 5 – HRS images Type de document : Article/Communication Auteurs : Stéphane Massera , Auteur ; Pascal Favé, Auteur ; Roland Gachet, Auteur ; Alain Orsoni , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2012 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 39-B1 Conférence : ISPRS 2012, Commission 1, 22th international congress 25/08/2012 01/09/2012 Melbourne Australie OA ISPRS Archives Commission 1 Importance : pp 251 - 256 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale
[Termes IGN] compensation par bloc
[Termes IGN] compensation par faisceaux
[Termes IGN] image SPOT 5
[Termes IGN] image SPOT-HRS
[Termes IGN] point d'appui
[Termes IGN] points homologues
[Termes IGN] spatiotriangulation
[Termes IGN] SURF (algorithme)Résumé : (auteur) The HRS (High Resolution Stereoscopic) instrument carried on SPOT 5 enables quasi-simultaneous acquisition of stereoscopic images on wide segments – 120 km wide – with two forward and backward-looking telescopes observing the Earth with an angle of 20° ahead and behind the vertical. For 8 years IGN (Institut Géographique National) has been developing techniques to achieve spatiotriangulation of these images. During this time the capacities of bundle adjustment of SPOT 5 – HRS spatial images have largely improved. Today a global single block composed of about 20,000 images can be computed in reasonable calculation time. The progression was achieved step by step: first computed blocks were only composed of 40 images, then bigger blocks were computed. Finally only one global block is now computed. In the same time calculation tools have improved: for example the adjustment of 2,000 images of North Africa takes about 2 minutes whereas 8 hours were needed two years ago. To reach such a result a new independent software was developed to compute fast and efficient bundle adjustments. In the same time equipment – GCPs (Ground Control Points) and tie points – and techniques have also evolved over the last 10 years. Studies were made to get recommendations about the equipment in order to make an accurate single block. Tie points can now be quickly and automatically computed with SURF (Speeded Up Robust Features) techniques. Today the updated equipment is composed of about 500 GCPs and studies show that the ideal configuration is around 100 tie points by square degree. With such an equipment, the location of the global HRS block becomes a few meters accurate whereas non adjusted images are only 15 m accurate. This paper will describe the methods used in IGN Espace to compute a global single block composed of almost 20,000 HRS images, 500 GCPs and several million of tie points in reasonable calculation time. Many advantages can be found to use such a block. Because the global block is unique it becomes easier to manage the historic and the different evolutions of the computations (new images, new GCPs or tie points). The location is now unique and consequently coherent all around the world, avoiding steps and artifacts on the borders of DSMs (Digital Surface Models) and OrthoImages historically calculated from different blocks. No extrapolation far from GCPs in the limits of images is done anymore. Using the global block as a reference will allow new images from other sources to be easily located on this reference. Numéro de notice : C2012-016 Affiliation des auteurs : IGN (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXIX-B1-251-2012 Date de publication en ligne : 24/07/2012 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXIX-B1-251-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94280 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)
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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)
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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]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)PermalinkGeoreferencing performance of THEOS satellite imagery / S. Liu in Photogrammetric record, vol 26 n° 134 (June - August 2011)PermalinkPhotogrammetric processing of low-altitude images acquired by unpiloted aerial vehicles / Y. Zhang in Photogrammetric record, vol 26 n° 134 (June - August 2011)PermalinkUsing horizontal and vertical building structure to constrain indirect sensor orientation / Markus Gerke in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)PermalinkCity model enrichment / P. Smart ; J. Quinn ; C. Jones in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 2 (March - April 2011)PermalinkIndirect georeferencing of digital SLR [single-lens reflex] imagery using signalised lidar control points / Edson Aparecido Mitishita in Photogrammetric record, vol 26 n° 133 (March - May 2011)PermalinkConstruction of digital 3D highway model using stereo IKONOS satellite imagery / Ahmed Shaker in Geocarto international, vol 26 n° 1 (February 2011)PermalinkMap generalisation / Jan‐Henrik Haunert in GIM international, vol 25 n° 1 (January 2011)PermalinkOrthorectification of VHR optical satellite data exploiting the geometric accuracy of TerraSAR-X data / Peter Reinartz in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 1 (January - February 2011)PermalinkPrecise georeferencing of long strips of ALOS imagery / Clive Simpson Fraser in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 1 (January 2011)Permalink