Descripteur
Documents disponibles dans cette catégorie (25)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Line-of-sight vector adjustment model for geopositioning of SPOT-5 stereo images / Hyung-Sup Jung in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 11 (November 2007)
[article]
Titre : Line-of-sight vector adjustment model for geopositioning of SPOT-5 stereo images Type de document : Article/Communication Auteurs : Hyung-Sup Jung, Auteur ; S.W. Kim, Auteur ; J.S. Wong, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 1267 - 1276 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] couple stéréoscopique
[Termes IGN] distorsion d'image
[Termes IGN] géoréférencement
[Termes IGN] image SPOT 5
[Termes IGN] image SPOT-HRG
[Termes IGN] ligne de visée
[Termes IGN] orbitographie
[Termes IGN] point d'appui
[Termes IGN] stéréoscopieRésumé : (Auteur) We formulate and present a new geopositioning method for SPOT-5 High-Resolution Geometric (HRG) stereo images, named the line-of-sight (LOS) vector adjustment model. It is applicable to satellites that move along a well-defined close-to-circular elliptical orbit with a predicted orbit close to true. SPOT-5 satisfies these requirements because it has the improved capability of providing accurate satellite attitude and a look angle for each detector. The method’s core idea is that only the LOS vector was adjusted when correcting the geometric distortion of SPOT-5 imagery. One advantage of this method is that it achieves high geopositioning accuracy with a limited number of ground control points (GCPs). Although a minimum of three GCPs is needed for processing, a test result satisfied the accuracy requirement within one pixel of a SPOT-5 panchromatic image even with only three GCPs. The performance in terms of root mean square error (RMSE) improved as the number of GCPs increased. Five GCPs were found to be the optimal number in the practical application of the LOS vector adjustment model. Using five GCPs, the RMSEs were 0.48 m and 0.64 m in planimetry and height, respectively. The test results indicate that the proposed method is superior to the bundle adjustment method for the geopositioning of SPOT-5 HRG stereo images. Copyright ASPRS Numéro de notice : A2007-517 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.11.1267 En ligne : http://dx.doi.org/10.14358/PERS.73.11.1267 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28880
in Photogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 11 (November 2007) . - pp 1267 - 1276[article]Orthophoto generation from unorganized point clouds / L. Tournas in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 11 (November 2007)
[article]
Titre : Orthophoto generation from unorganized point clouds Type de document : Article/Communication Auteurs : L. Tournas, Auteur ; M. Tsakiri, Auteur Année de publication : 2007 Article en page(s) : pp 1277 - 1283 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données laser
[Termes IGN] données localisées 3D
[Termes IGN] lasergrammétrie
[Termes IGN] ligne de visée
[Termes IGN] orthoimage
[Termes IGN] semis de points
[Termes IGN] télémétrie laser terrestre
[Termes IGN] tessellation
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) The reconstruction of realistic precise surfaces is required in many different applications. To date, terrestrial laser scanning offers 3D input data which are suitable for surface generation but are lacking in photo-realistic appearance. Texture for scanned surfaces can be provided by orthophotos generated from photographs that are acquired from almost the same viewpoint as the incident laser beam. However, the creation of an orthophoto using typical photogrammetric procedures requires the representation of the scanned surface with a triangulated mesh which cannot be created automatically in all cases. In this paper, a new method for automatic orthophoto generation from unorganized point clouds is presented. In the proposed methodology, the acquisition of accurate height information is directly derived from the point cloud without the prior requirement of a triangulated mesh. Analysis of experimental data with large height variations demonstrates the success of the algorithm which produces an orthophoto in near real-time. Issues on the performance of the method are also discussed. Copyright ASPRS Numéro de notice : A2007-518 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.11.1277 En ligne : http://dx.doi.org/10.14358/PERS.73.11.1277 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28881
in Photogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 11 (November 2007) . - pp 1277 - 1283[article]Modeling visibility through vegetation / M. Llobera in International journal of geographical information science IJGIS, vol 21 n° 6-7 (july 2007)
[article]
Titre : Modeling visibility through vegetation Type de document : Article/Communication Auteurs : M. Llobera, Auteur Année de publication : 2007 Article en page(s) : pp 799 - 810 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] archéométrie
[Termes IGN] données localisées 3D
[Termes IGN] ligne de visée
[Termes IGN] végétation
[Termes IGN] visibilitéRésumé : (Auteur) The calculation of visibility patterns associated with past monuments and sites is an important element in modern landscape archaeology. These types of investigations have been limited by the inability of current viewshed routines to incorporate vegetation information. The following paper presents a new viewshed algorithm aimed at calculating the probability of locations being visible in the presence of vegetation. To this day, little work has been done to address this limitation, a notable exception is Dean's Permeability Index Model (1997). A review of Dean's model is provided here in the light of the new proposed algorithm. The new algorithm is based on mathematical principles found in Beer-Lambert's Attenuation Law, a physics law governing the attenuation of light through a medium. In addition to common viewshed parameters, the routine requires a 3D model of a tree/plant and a layer indicating the spatial distribution and density of vegetation on the landscape. The possibility of varying both, the spatial and density distribution of tree/plants, and the three-dimensional model representing vegetation makes the model well suited to investigate the impact that vegetation may have on visibility patterns. Copyright Taylor & Francis Numéro de notice : A2007-272 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810601169865 En ligne : https://doi.org/10.1080/13658810601169865 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28635
in International journal of geographical information science IJGIS > vol 21 n° 6-7 (july 2007) . - pp 799 - 810[article]Réservation
Réserver ce documentExemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 079-07041 RAB Revue Centre de documentation En réserve L003 Disponible 079-07042 RAB Revue Centre de documentation En réserve L003 Disponible Rigorous approach to bore-sight self-calibration in airborne laser scanning [erratum in vol 61 n° 6 February 2007, pages 414-415] / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 1 (October 2006)
[article]
Titre : Rigorous approach to bore-sight self-calibration in airborne laser scanning [erratum in vol 61 n° 6 February 2007, pages 414-415] Type de document : Article/Communication Auteurs : Jan Skaloud, Auteur ; Derek D. Lichti, Auteur Année de publication : 2006 Article en page(s) : pp 47 - 59 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] angle de visée
[Termes IGN] auto-étalonnage
[Termes IGN] données lidar
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] ligne de visée
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) We present a rigorous method for estimating some of the calibration parameters in airborne laser scanning (ALS), namely the three bore-sight angles and the range-finder offset. The technique is based on expressing the system calibration parameters within the direct-georeferencing equation separately for each target point, and conditioning a group of points to lie on a common surface of a known form such as a plane. However, the assumed a priori information about á chosen planar features is only their form not the spatial orientation or position. Thus, the 4·á plane parameters are estimated together with the calibration parameters in a combined adjustment model that makes use of GPS/INS-derived position and orientation as well as LiDAR range and encoder angle as observations. To make the approach practical when working with voluminous ALS and GPS/INS data, the contribution of each laser point to the normal equations is formed sequentially. The discussions focus on practical examples with data from a continuously-rotating scanner that reveal the conditions under which almost complete de-correlation between the estimated parameters occurs. In such a case, all bore-sight angles are determined with accuracy that is several times superior to the system noise level. Given sufficiently strong geometry, the presented method is shown to be not only accurate but also very robust in terms of convergence. When appropriate, the method is applicable for calibration of additional systematic effects such as laser-beam encoder offsets or scale factor with minimal modification to the functional model. Copyright ISPRS Numéro de notice : A2006-441 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.07.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.07.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28165
in ISPRS Journal of photogrammetry and remote sensing > vol 61 n° 1 (October 2006) . - pp 47 - 59[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 081-06071 SL Revue Centre de documentation Revues en salle Disponible Reliability of direct georeferencing: A case study on practical problems and solutions / Klaus Legat (2006)
Titre : Reliability of direct georeferencing: A case study on practical problems and solutions : Final report on phase 2 Type de document : Rapport Auteurs : Klaus Legat, Auteur ; Jan Skaloud, Auteur ; Ronald Schmidt, Auteur Editeur : Dublin : European Spatial Data Research EuroSDR Année de publication : 2006 Collection : EuroSDR official publication, ISSN 0257-0505 num. 51 Importance : pp 169 - 188 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] centrale inertielle
[Termes IGN] correction des altitudes
[Termes IGN] étalonnage
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] ligne de visée
[Termes IGN] orientation du capteur
[Termes IGN] source d'erreur
[Termes IGN] système de numérisation mobile
[Termes IGN] traitement de donnéesRésumé : (auteur) This report studies a practical problem related to the use of GPS/INS technology for sensor direct georeferencing. It is a case study of a specific, yet typical, situation where the performance of a GPS/INS was pronounced unsatisfactory for orientation of an airborne sensor. However, it was in fact not the poor quality of the navigation data but rather numerous disregards occurring in the flight execution and data treatment that have led to this wrong conclusion. The presented analysis reveals the errors committed at different stages of data treatment and quantifies their impact on the sensor exterior orientation. It also explains the remedies employed to mitigate their impact. The recommended procedures are drafted in a summary. Numéro de notice : H2006-003 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Chapître / contribution En ligne : http://www.eurosdr.net/publications/official-publication-no-51-2006 Format de la ressource électronique : URL bulletin Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93670 Documents numériques
en open access
Reliability of Direct Georeferencing... - pdf auteurAdobe Acrobat PDF Influence of system calibration on direct sensor orientation / N. Yastikli in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 5 (May 2005)PermalinkGéoréférencement direct des images par GPS/INS : Approche rigoureuse pour le calibrage des excentricités angulaires (boresight calibration) / Philipp Schaer in Géomatique suisse, vol 101 n° 8 (01/08/2003)PermalinkA fast algorithm for approximate viewshed computation / D. Izraelevitz in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)PermalinkVisualizing topography by openness: a new application of image processing to digital elevation models / R. Yokoyama in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 3 (March 2002)PermalinkSur la technique "LOS" en planètologie / Georges Balmino (1988)PermalinkEtude des mouvements du télescope du laser-lune / Pierre Cormier in Bulletin d'information de l'Institut géographique national, n° 50 (juillet 1984)PermalinkCalibration of radar antenna and positioning camera axes of the airborne profile recorder system / Army map service (1960)Permalink