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Simultane Neuausgleichung des globalen 3D-Mars-Netzes / W. Zeitler (1999)

Public Titre : Simultane Neuausgleichung des globalen 3D-Mars-Netzes Titre original : [Nouvelle compensation simultanée du réseau global tridimensionnel de Mars] Type de document : Thèse/HDR Auteurs : W. Zeitler, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 511 Importance : 75 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9549-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Astrophysique [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] Mars (planète) [Termes IGN] PathFinder [Termes IGN] réseau géodésique tridimensionnel [Termes IGN] valeur efficace Index. décimale : 31.20 Astrophysique Résumé : (Auteur) For future missions and other scientific purposes on Mars the existing global control point network was readjusted. This network consists of a large number of surface features which can be seen in the images, whereas their object co-ordinates were photogrametrically derived by using images of the Viking missions to Mars. In the context of new missions to the Red Planet, many input parameters of the global bundle block adjustment like the gravitational field of Mars, the Viking orbit information of the spacecrafts and the occultation data, were newly analysed. Additionally, the Pathfinder mission in 1997 provides with its successful lander- a new ground control point and with the help of the communication radio signal new and accurate estimates of the rotational parameters of Mars. All this datasets are influencing directly the object co-ordinates of the surface landmarks and their accuracy, so it was necessary to recompute and update the global control point network using this new information. Due to the today's computer power a simultaneous processing of all input parameters was possible to ensure a consistent handling of the data and to get high accuracy of the ground co-ordinates. Within a bundle block adjustment 7 parameters of the interior orientation, the positions and attitude angles of 1140 images and the object co-ordinates of 3739 points were estimated. The mathematical model of this photogrammetric adjustment is based on the collinearity equations, where the positions of the images are treated independently from each other. The rms values of the theoretical standard deviation of the adjusted ground co-ordinates amount to 740 m, which is a significant improvement compared with former results (1 5 km). The accuracy of the ground point co-ordinates is very close to the theoretical accuracy limit of 520 m, where error-free orientation parameters are assumed. Using the data in the present case, no additional increasement of the accuracy can be achieved. The datasets were furthermore used as input for a bundle block adjustment with orbital constraints. In this case the orbit trajectory of the spacecraft will be estimated instead of the single image positions which are a function of that trajectory. This ensures the proper handling of the position data, all images taken in one orbit are lying on a physical consistent trajectory. The global adjustment was performed using this new adjustment approach, but it was found out that the data are not suited for this special technique. Therefore no final results using orbital constraints were achieved. Numéro de notice : 57824 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60287

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
57824-01	31.20	Livre	Centre de documentation	En réserve M-103	Disponible