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Spatial knowledge acquisition with mobile maps, augmented reality and voice in the context of GPS-based pedestrian navigation: results from a field test / H. Huang in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)
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Titre : Spatial knowledge acquisition with mobile maps, augmented reality and voice in the context of GPS-based pedestrian navigation: results from a field test Type de document : Article/Communication Auteurs : H. Huang, Auteur ; M. Schmidt, Auteur ; Georg Gartner, Auteur Année de publication : 2012 Article en page(s) : pp 107 - 116 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] acquisition de connaissances
[Termes IGN] analyse comparative
[Termes IGN] appareil portable
[Termes IGN] interface mobile
[Termes IGN] interface web
[Termes IGN] navigation pédestre
[Termes IGN] positionnement par GPS
[Termes IGN] réalité augmentée
[Termes IGN] système de navigation
[Termes IGN] utilisateur nomade
[Termes IGN] voixRésumé : (Auteur) GPS-based pedestrian navigation systems have become increasingly popular. Different interface technologies can be used to communicate/convey route directions to pedestrians. This paper aims to empirically study the influence of different interface technologies on spatial knowledge acquisition in the context of GPS-based pedestrian navigation. A field experiment was implemented to address this concern. Firstly, the suitability of the evaluation methods in assessing spatial knowledge acquisition was analyzed empirically (focusing on the ability of differentiating “familiar“ and “unfamiliar“ participants). The suitable methods were then used to compare the influence of mobile maps, augmented reality, and voice on spatial learning. The field test showed that in terms of spatial knowledge acquisition, the three interface technologies led to comparable results, which were not significantly different from each other. The results bring some challenging issues for consideration when designing mobile pedestrian navigation systems. Numéro de notice : A2012-455 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/15230406392107 En ligne : https://doi.org/10.1559/15230406392107 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31901
in Cartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 107 - 116[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-2012021 RAB Revue Centre de documentation En réserve L003 Disponible Terrestrial laser scanning for delineating in-stream boulders and quantifying habitat complexity measures / J. Resop in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 4 (April 2012)
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Titre : Terrestrial laser scanning for delineating in-stream boulders and quantifying habitat complexity measures Type de document : Article/Communication Auteurs : J. Resop, Auteur ; J. Kozarek, Auteur ; W. Hession, Auteur Année de publication : 2012 Article en page(s) : pp 363 - 371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] analyse comparative
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] habitat animal
[Termes IGN] rivière
[Termes IGN] rocher
[Termes IGN] tachéomètre électronique
[Termes IGN] Virginie (Etats-Unis)Résumé : (Auteur) Accurate stream topography measurement is important for many ecological applications such as hydraulic modeling and habitat characterization. Habitat complexity measures are often made using visual approximations or total station (TS) surveying that can be subjective and have limited spatial resolution. Terrestrial laser scanning (TLS) can measure topography at a high resolution and accuracy. Two methods, TS surveying and TLS, were compared for measuring complex topography in a boulder-dominated 100 m forested reach of the Staunton River in Shenandoah National Park, Virginia. The mean absolute difference between the two datasets was 0.11 m with 82.3 percent of the TS data within _0.1 m of TLS. The TLS dataset was processed to remove vegetation and create a 2 cm digital elevation model (DEM). An algorithm was developed for delineating rocks within the stream channel from the DEM. A common ecological metric based on the structural complexity of the stream, percent in-stream rock cover, was calculated from the TLS dataset, and the results were compared to estimates from traditional methods. This application illustrates the potential of TLS to quantify habitat complexity measures in an automated, unbiased manner. Numéro de notice : A2012-179 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.4.363 En ligne : https://doi.org/10.14358/PERS.78.4.363 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31626
in Photogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 4 (April 2012) . - pp 363 - 371[article]Accuracy evaluation for automated optical indoor positioning using a camera phone / V. Händler in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, vol 137 n° 2 (01/03/2012)
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Titre : Accuracy evaluation for automated optical indoor positioning using a camera phone Type de document : Article/Communication Auteurs : V. Händler, Auteur ; V. Willert, Auteur Année de publication : 2012 Article en page(s) : pp 114 - 122 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] analyse comparative
[Termes IGN] classification
[Termes IGN] estimation de précision
[Termes IGN] GNSS assisté pour la navigation
[Termes IGN] image terrestre
[Termes IGN] porte
[Termes IGN] positionnement en intérieur
[Termes IGN] relèvement
[Termes IGN] système optique
[Termes IGN] téléphone intelligentRésumé : (Auteur) In this paper, we focus on the accuracy of optical indoor positioning and the design of an automated and mobile positioning system based on pictures taken by a cell phone camera. We restrict ourselves to automated relative pose estimation given only one image including the projection of an object with four reference points with known image and world coordinates. To infer the relative pose from the image coordinates of the reference points, we first have to detect and classify an object, afterwards localize the image coordinates, and finally apply spatial resection. We show, that if an object is correctly classified, then the quality of the positioning heavily depends on the accuracy of the localization of the image coordinates and on the choice of the spatial resection algorithm. To this end, we compare three different spatial resection algorithms and present two combinations of object classification and image coordinate localization techniques using doors as known objects. Statistical evaluations are provided to judge the different classification methods in terms of robustness and to present the accuracy of the image coordinate localization techniques. Numéro de notice : A2012-267 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31713
in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement > vol 137 n° 2 (01/03/2012) . - pp 114 - 122[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 199-2012021 RSREV Revue Centre de documentation Revues en salle Disponible Building-damage detection using pre- and post-seismic high-resolution satellite stereo imagery: A case study of the May 2008 Wenchuan earthquake / X. Tong in ISPRS Journal of photogrammetry and remote sensing, vol 68 (March 2012)
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Titre : Building-damage detection using pre- and post-seismic high-resolution satellite stereo imagery: A case study of the May 2008 Wenchuan earthquake Type de document : Article/Communication Auteurs : X. Tong, Auteur ; Z. Hong, Auteur ; S. Liu, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 13 - 27 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse comparative
[Termes IGN] analyse diachronique
[Termes IGN] bati
[Termes IGN] détection de changement
[Termes IGN] dommage matériel
[Termes IGN] hauteur du bâti
[Termes IGN] image Ikonos
[Termes IGN] modèle numérique de surface
[Termes IGN] séisme
[Termes IGN] Setchouan (Chine)Résumé : (Auteur) To address the disadvantage of traditional methods providing only two-dimensional (2D) damage change of the collapsed buildings, this paper presents an approach for the detection of the buildings that have collapsed in an earthquake based on 3D geometric changes, particularly height change of the buildings, using pre- and post-seismic IKONOS stereo image pairs. One of the critical issues – the accuracy of the 3D ground point determination from high-resolution satellite imagery (HRSI) – is first addressed employing a bias-compensation model based on the rational function polynomial coefficient bundle adjustment. With the refined 3D ground coordinates, two ways of detecting the collapsed buildings are proposed: (1) detection of an individual collapsed building by comparing the height differences at the corner points of the building calculated from the pre- and post-seismic IKONOS stereo pairs and (2) determination of the region of collapsed buildings by calculating the difference between the pre- and post-seismic digital elevation models (DEMs) generated again from the pre- and post-seismic stereo images. At the same time, a pre-seismic DEM based on a topographical map is generated for detection comparison in the study. The experiment results for Dujiangyan using two IKONOS stereo pairs before and after the Wenchuan earthquake demonstrated the following. (1) Accuracy of better than 1.1 m in planimetry and 1.5 m in height can be achieved from the pre- and post-seismic IKONOS stereo image pairs using the affine bias compensation model. This accuracy guarantees the feasibility of detecting the 3D geometric changes of the earthquake-induced building collapses from pre- and post-seismic HRSI stereo images. (2) Using the refined 3D coordinates of the ground points computed from the pre- and post-seismic IKONOS stereo pairs, the status (i.e., totally collapsed, partially collapsed or not collapsed) and the number of collapsed storeys can be estimated for an individual building being assessed. (3) The region of collapsed buildings can be determined by differencing the pre- and post-seismic DEMs created from the pre- and post-seismic IKONOS stereo pairs. An overall accuracy of better than 90% is achieved for the detection of the collapsed buildings based on the difference DEM using the pixel- and object-based assessment methods. Numéro de notice : A2012-145 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.12.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.12.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31592
in ISPRS Journal of photogrammetry and remote sensing > vol 68 (March 2012) . - pp 13 - 27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2012021 SL Revue Centre de documentation Revues en salle Disponible Relative radiometric correction of multi-temporal ALOS AVNIR-2 data for the estimation of forest attributes / Q. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 68 (March 2012)
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Titre : Relative radiometric correction of multi-temporal ALOS AVNIR-2 data for the estimation of forest attributes Type de document : Article/Communication Auteurs : Q. Xu, Auteur ; Z. Hou, Auteur ; Timo Tokola, Auteur Année de publication : 2012 Article en page(s) : pp 69 - 78 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse comparative
[Termes IGN] correction radiométrique
[Termes IGN] détection
[Termes IGN] forêt
[Termes IGN] image ALOS-AVNIR2
[Termes IGN] image multitemporelle
[Termes IGN] précision des données
[Termes IGN] troncRésumé : (Auteur) Relative radiometric correction methods have been widely used to correct ground illumination difference in multi-temporal satellite data. ALOS (Advanced Land Observing Satellite) data starts to play an important role in forest and carbon assessment, such as the REDD (Reducing Emissions from Deforestation and forest Degradation) program. The objective of the study was to compare three relative radiometric correction methods for five multi-temporal ALOS AVNIR-2 (Advanced Visible and Near Infrared Radiometer) images, and to examine the influence of each correction method on the estimation accuracy of forest attributes with auxiliary field inventory plot data. Both spectral features and textural features were extracted before and after radiometric correction and used in estimation procedure. All the radiometric correction methods used improved the estimation accuracy of forest stem volume at plot level, and they were MAD (multivariate alteration detection) transformation-based normalization, PCA (principle component analysis)-based correction and local radiometric correction, among which MAD transformation-based normalization exceeded others by reducing the relative RMSE by 5.75% with the ordinary least square fitting and 6.8% with the K-MSN (K-Most Similar Neighbour) method both after leave-one-out cross-validation. RMSE for only the corrected area is also calculated, in view of the small proportion of plots in that area. The result can be used to improve the visual effect of mosaics of multi-temporal ALOS scenes, and to retrieve more accurate forest estimates for national forest resources and biomass mapping. Numéro de notice : A2012-147 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.12.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.12.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31594
in ISPRS Journal of photogrammetry and remote sensing > vol 68 (March 2012) . - pp 69 - 78[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2012021 SL Revue Centre de documentation Revues en salle Disponible The US Gravimetric Geoid of 2009 (USGG2009): model development and evaluation / Y. Wang in Journal of geodesy, vol 86 n° 3 (March 2012)
PermalinkCity maps versus map-based navigation systems - An empirical approach to building mental representations / Frank Dickmann in Cartographic journal (the), vol 49 n° 1 (February 2012)
PermalinkFast integer least-squares estimation for GNSS high-dimensional ambiguity resolution using lattice theory / S. Jazaeri in Journal of geodesy, vol 86 n° 2 (February 2012)
PermalinkRemote evaluation of the execution of spatial analysis tasks with interactive web maps : A functional and quantitative approach / A. De Mendonça in Cartographic journal (the), vol 49 n° 1 (February 2012)
PermalinkAn accuracy assessment of automated photogrammetric techniques for 3D modeling of complex interiors / Athanasios Georgantas (2012)
PermalinkPermalinkPermalinkLes forêts de Cassini : analyse quantitative et comparaison avec les forêts actuelles / Daniel Vallauri (2012)
PermalinkPermalinkKnow your enemy: signal characteristics of civil GPS jammers / R. Mitch in GPS world, vol 23 n° 1 (January 2012)
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