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A fully automatic approach to register mobile mapping and airborne imagery to support the correction of plateform trajectories in GNSS-denied urban areas / Phillipp Jende in ISPRS Journal of photogrammetry and remote sensing, vol 141 (July 2018)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 141 (July 2018) . - pp 86 - 99 Titre : A fully automatic approach to register mobile mapping and airborne imagery to support the correction of plateform trajectories in GNSS-denied urban areas Type de document : Article/Communication Auteurs : Phillipp Jende, Auteur ; Francesco Nex, Auteur ; Markus Gerke, Auteur ; M. George Vosselman, Auteur Année de publication : 2018 Article en page(s) : pp 86 - 99 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] appariement géométrique [Termes IGN] extraction de traits caractéristiques [Termes IGN] filtre de Wallis [Termes IGN] GNSS assisté pour la navigation [Termes IGN] image aérienne [Termes IGN] image terrestre [Termes IGN] orientation d'image [Termes IGN] orthoimage [Termes IGN] point d'appui [Termes IGN] précision décimétrique [Termes IGN] système de numérisation mobile [Termes IGN] zone urbaine Résumé : (Auteur) Mobile Mapping (MM) solutions have become a significant extension to traditional data acquisition methods over the last years. Independently from the sensor carried by a platform, may it be laser scanners or cameras, high-resolution data postings are opposing a poor absolute localisation accuracy in urban areas due to GNSS occlusions and multipath effects. Potentially inaccurate position estimations are propagated by IMUs which are furthermore prone to drift effects. Thus, reliable and accurate absolute positioning on a par with MM's high-quality data remains an open issue. Multiple and diverse approaches have shown promising potential to mitigate GNSS errors in urban areas, but cannot achieve decimetre accuracy, require manual effort, or have limitations with respect to costs and avail-ability. This paper presents a fully automatic approach to support the correction of MM imaging data based on correspondences with airborne nadir images. These correspondences can be employed to correct the MM plat-form's orientation by an adjustment solution. Unlike MM as such, aerial images do not suffer from GNSS oc-clusions, and their accuracy is usually verified by employing well-established methods using ground control points. However, a registration between MM and aerial images is a non-standard matching scenario, and requires several strategies to yield reliable and accurate correspondences. Scale, perspective and content strongly vary between both image sources, thus traditional feature matching methods may fail. To this end, the registration process is designed to focus on common and clearly distinguishable elements, such as road markings, manholes, or kerbstones. With a registration accuracy of about 98%, reliable tie information between MM and aerial data can be derived. Even though, the adjustment strategy is not covered in its entirety in this paper, accuracy results after adjustment will be presented. It will be shown that a decimetre accuracy is well achievable in a real data test scenari Numéro de notice : A2018-285 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2018.04.017 Date de publication en ligne : 30/04/2018 En ligne : https://doi.org/10.1016/j.isprsjprs.2018.04.017 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90397 [article]

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Landmark based localization in urban environment / Xiaozhi Qu in ISPRS Journal of photogrammetry and remote sensing, vol 140 (June 2018)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 140 (June 2018) . - pp 90 - 103 Titre : Landmark based localization in urban environment Type de document : Article/Communication Auteurs : Xiaozhi Qu , Auteur ; Bahman Soheilian , Auteur ; Nicolas Paparoditis , Auteur Année de publication : 2018 Projets : 1-Pas de projet / Article en page(s) : pp 90 - 103 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] amer [Termes IGN] compensation locale par faisceaux [Termes IGN] données localisées 3D [Termes IGN] données multicapteurs [Termes IGN] estimation de pose [Termes IGN] incertitude géométrique [Termes IGN] odomètre [Termes IGN] précision décimétrique [Termes IGN] propagation d'incertitude Résumé : (auteur) A landmark based localization with uncertainty analysis based on cameras and geo-referenced landmarks is presented in this paper. The system is developed to adapt different camera configurations for six degree-of-freedom pose estimation. Local bundle adjustment is applied for optimization and the geo-referenced landmarks are integrated to reduce the drift. In particular, the uncertainty analysis is taken into account. On the one hand, we estimate the uncertainties of poses to predict the precision of localization. On the other hand, uncertainty propagation is considered for matching, tracking and landmark registering. The proposed method is evaluated on both KITTI benchmark and the data acquired by a mobile mapping system. In our experiments, decimeter level accuracy can be reached. Numéro de notice : A2018-198 Affiliation des auteurs : LaSTIG MATIS (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2017.09.010 Date de publication en ligne : 28/09/2017 En ligne : https://doi.org/10.1016/j.isprsjprs.2017.09.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89867 [article]

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Maintaining real-time precise point positioning during outages of orbit and clock corrections / Ahmed El-Mowafy in GPS solutions, vol 21 n° 3 (July 2017)  

Public [article]  inGPS solutions > vol 21 n° 3 (July 2017) . - pp 937 – 947 Titre : Maintaining real-time precise point positioning during outages of orbit and clock corrections Type de document : Article/Communication Auteurs : Ahmed El-Mowafy, Auteur ; Manoj Deo, Auteur ; Nobuaki Kubo, Auteur Année de publication : 2017 Article en page(s) : pp 937 – 947 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] horloge [Termes IGN] International GNSS Service [Termes IGN] international GPS service for geodynamics [Termes IGN] interruption du signal [Termes IGN] orbitographie [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement ponctuel précis [Termes IGN] précision décimétrique [Termes IGN] prévision Résumé : (auteur) The precise point positioning (PPP) is a popular positioning technique that is dependent on the use of precise orbits and clock corrections. One serious problem for real-time PPP applications such as natural hazard early warning systems and hydrographic surveying is when a sudden communication break takes place resulting in a discontinuity in receiving these orbit and clock corrections for a period that may extend from a few minutes to hours. A method is presented to maintain real-time PPP with 3D accuracy less than a decimeter when such a break takes place. We focus on the open-access International GNSS Service (IGS) real-time service (RTS) products and propose predicting the precise orbit and clock corrections as time series. For a short corrections outage of a few minutes, we predict the IGS-RTS orbits using a high-order polynomial, and for longer outages up to 3 h, the most recent IGS ultra-rapid orbits are used. The IGS-RTS clock corrections are predicted using a second-order polynomial and sinusoidal terms. The model parameters are estimated sequentially using a sliding time window such that they are available when needed. The prediction model of the clock correction is built based on the analysis of their properties, including their temporal behavior and stability. Evaluation of the proposed method in static and kinematic testing shows that positioning precision of less than 10 cm can be maintained for up to 2 h after the break. When PPP re-initialization is needed during the break, the solution convergence time increases; however, positioning precision remains less than a decimeter after convergence. Numéro de notice : A2017-442 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-016-0583-4 En ligne : https://doi.org/10.1007/s10291-016-0583-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86360 [article]

Positional accuracy control in dense urban environment with low-cost receiver and multi-constellation GNSS / Yann Méneroux (2017) 

Public Titre : Positional accuracy control in dense urban environment with low-cost receiver and multi-constellation GNSS Type de document : Article/Communication Auteurs : Yann Méneroux , Auteur ; Dinesh Manandhar, Auteur ; Saurav Ranjit, Auteur ; Guillaume Saint Pierre, Auteur ; Ryosuke Shibasaki, Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN Année de publication : 2017 Projets : 1-Pas de projet / Conférence : MGA 2017, 9th Multi-GNSS Asia Conference 09/10/2017 11/10/2017 Jakarta Indonésie Importance : 5 p. Note générale : bibliographie références https://hal.archives-ouvertes.fr/hal-02193751 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] constellation [Termes IGN] constellation BeiDou [Termes IGN] constellation GLONASS [Termes IGN] positionnement par GNSS [Termes IGN] précision décimétrique [Termes IGN] RTKLIB Résumé : (auteur) In this work, we investigate the effectiveness of a method leveraging multi-GNSS positioning with low-cost receiver to control the accuracy of a set of predefined points with short time acquisition and reduced sky view factor. Final accuracy is required to be sub-meter level. 20 positions located in Tokyo (Japan) have been observed for 6 minutes with a u-blox NEO M8T receiver and a L1-band antenna. Solutions have been computed with the free software RTKlib, for different combinations of satellite constellations. Eventually, we derived a probabilistic upper bound on the controlled points root mean square error (rmse) based on Rayleigh distribution and the central limit theorem. Results highlighted that completing GPS with one additional constellation may markedly reduce the predicted rmse as well as the convergence time. The gain in accuracy has been found to be more moderated when a maximal number of constellations is added, despite solution is reached much faster. We shall notice however that these findings may be dependent upon the selected mask angle for the computation. Some further analysis is also required to assess more precisely the respective contributions of GLONASS and Beidou systems in the overall enhancement. Numéro de notice : C2017-056 Affiliation des auteurs : LaSTIG+Ext (2016-2019) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97092

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Surface reconstruction and landslide displacement measurements with Pléiades satellite images / André Stumpf in ISPRS Journal of photogrammetry and remote sensing, vol 95 (September 2014)

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 95 (September 2014) . - pp 1 – 12 Titre : Surface reconstruction and landslide displacement measurements with Pléiades satellite images Type de document : Article/Communication Auteurs : André Stumpf, Auteur ; Jean-Philippe Malet, Auteur ; P. Allemand, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 1 – 12 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] effondrement de terrain [Termes IGN] image Pléiades-HR [Termes IGN] mesure géométrique [Termes IGN] point d'appui [Termes IGN] précision décimétrique Résumé : (Auteur) Recent advances in image-matching techniques and VHR satellite imaging at submeter resolution theoretically offer the possibility to measure Earth surface displacements with decimetric precision. However, this possibility has yet not been explored and requirements of ground control and external topographic datasets are considered as important bottlenecks that hinder a more common application of optical image correlation for displacement measurements. This article describes an approach combining spaceborne stereo-photogrammetry, orthorectification and sub-pixel image correlation to measure the horizontal surface displacement of landslides from Pléiades satellite images. The influence of the number of ground-control points on the accuracy of the image orientation, the extracted surface models and the estimated displacement rates is quantified through comparisons with airborne laser scan and in situ global navigation satellite measurements at permanent stations. The comparison shows a maximum error of 0.13 m which is one order of magnitude more accurate than what has been previously reported with spaceborne optical images from other sensors. The obtained results indicate that the approach can be applied without significant loss in accuracy when no ground control points are available. It could, therefore, greatly facilitate displacement measurements for a broad range of applications. Numéro de notice : A2014-472 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74049 [article]

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Imagerie : La 3D urbaine met le turbo / Marielle Mayo in Géomètre, n° 2105 (juillet - août 2013)

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Hellenic terrestrial reference system 2007 (HTRS07): a regional realization of ETRS89 over Greece in support of HEPOS / K. Katsampalos in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)

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Cartographie héliportée avec un système Lidar photogrammétrique portable à la main : expériences pratiques en montagne, analyse des performances et de la phase de calibration / Jacques Vallet in Revue Française de Photogrammétrie et de Télédétection, n° 192 (Septembre 2010)

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Consistency of accuracy assessment indices for soft classification: simulation analysis / J. Chen in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)

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Real-time registration of airborne laser with sub-decimeter accuracy / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)

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Small-footprint laser scanning simulator for system validation, error assessment, and algorithm development / Antero Kukko in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 10 (October 2009)

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STARFIRE™ et algorithme temps réel Gipsy / T. Sharpe in Géomatique expert, n° 67 (01/02/2009)

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Trajectory determination and analysis in sports by satellite and inertial navigation / Adrian Wägli (2009)  

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Mesures aéroportées et mesures terrestres : deux cas d 'emploi / Michel Kasser in Géomètre, n° 2036 (avril 2007)

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Assessment of long-range kinematic GPS positioning errors by comparison with airborne laser altimetry and satellite altimetry / X. Zhang in Journal of geodesy, vol 81 n° 3 (March 2007)

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