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Affiner la recherche Interroger des sources externesKlassifikation und Interpolation mittels affin invarianter Voronoidiagramme auf der Basis eines Wahrscheinlich- keitsmaßes in großmaßstäbigen Geoinformationssystemen / R. Roschlaub (1999)
Titre : Klassifikation und Interpolation mittels affin invarianter Voronoidiagramme auf der Basis eines Wahrscheinlich- keitsmaßes in großmaßstäbigen Geoinformationssystemen Titre original : [Classification et interpolation au moyen d'un diagramme de Voronoi affine et invariant sur la base d'une mesure de vraisemblance dans un système d'information géographique à grande échelle] Type de document : Thèse/HDR Auteurs : R. Roschlaub, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 509 Importance : 90 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9547-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes descripteurs IGN] classification par maximum de vraisemblance
[Termes descripteurs IGN] diagramme de Voronoï
[Termes descripteurs IGN] modèle linéaire
[Termes descripteurs IGN] Projection de Soldner
[Termes descripteurs IGN] projection Universal Transverse Mercator
[Termes descripteurs IGN] théorie des graphes
[Termes descripteurs IGN] transformationRésumé : (Auteur) Empirical results form the basis of a prototype for transformation and interpolation of massdata in a geoinformatic system. The empirical researches of the new approach for classification and interpolation deal with the following three cases of continuation : 1- the transformation between Soldner- and Gauß-Krüger-Coordinates, 2- continuation of Gauß-Krüger-Coordinates according to GPS measurements and 3- continuation of digitized maps based on official Gauß-Krüger-Coordinates. For this new prototype, a new theoretical approach for a transformation based on affin invariant Voronoi-Graphs is presented. For this purpose, the basics of a new classification procedure are explained and a method for faithful interpolation in neighborhood of masspoints is given. The new approach is a general method for transformation and interpolation of scattered massdata and might be used in geoinformatic systems as well as in related geodetic terms of reference. The new developed classification procedure uses a mixture density model to formulate a strict size of probability according to the theory of probability. Here, the problem of class division is solved for the first time by means of the EM-Algorithm which gains more and more acceptance in statistics. In order to determine the transformation parameters of each class, a new developed QR-Decomposition is applied, enabling a solution to all common problems of minimization explicitly. The according cofactor matrices might be determined by a consistent presentation as well. Numéro de notice : 56340 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60009 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 56340-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 56340-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible National report of the Federal Republic of Germany on the geodetic activities in the years 1995 - 1999 / B. Heck (1999)
Titre : National report of the Federal Republic of Germany on the geodetic activities in the years 1995 - 1999 : XXII [22] general assembly of the International Union for Geodesy and Geophysics (IUGG) 1999 in Birmingham Type de document : Rapport Auteurs : B. Heck, Auteur ; Reiner Rummel, Auteur ; E. Groten, Auteur ; H. Hornik, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 308 Importance : 124 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8588-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes descripteurs IGN] activité géodésique
[Termes descripteurs IGN] champ de pesanteur terrestre
[Termes descripteurs IGN] géodésie spatiale
[Termes descripteurs IGN] géodynamique
[Termes descripteurs IGN] géopositionnement
[Termes descripteurs IGN] modélisation
[Termes descripteurs IGN] problème des valeurs limites
[Termes descripteurs IGN] République fédérale d'AllemagneNote de contenu : Section 1: Positioning
Positioning - Overview and highlights H. DREWES
Permanent GPS networks and reai-time positioning W. SCHLÜTER, K. PAHLER
Positioning for global and long range applications W. SCHLÜTER, E. REINHART, K. PAHLER
Positioning for close range and engineering application B. WITTE
With contributions by M. BAUMKER, H.-P. FITZEN and E. GROTEN
Section Il : Advanced space technology
Advanced space technology - Overview and highlights R. RUMMEL
Space observation instrumentation and satellite systems CH. REIGBER
Spaceborne atmospheric monitoring R. KÔNIG
Satellite orbit modelling J. DOW
Section III : Determination of the gravity field
Determination of the gravity field - Overview and highlights G. BOEDECKER
Absolute and relative gravimetry M. BECKER
Kinematic gravimetry G.W. HEIN
Global gravity field modelling T. GRUBER
Regional and local gravity field modelling H. DENKER
Section IV : General theory and methodology
Physical aspects of modeling in geodesy - Overview and highlights B. HECK
Physical aspects of modelling in geodesy E. GRAFAREND
Mathematical aspects of modelling K.H. ILK
Theory of data évaluation S. MEIER
Section V : Geodynamics
Recent crustai movements and déformations W. AUGATH
Tides and other temporal variations of the gravity field B. RICHTER
Sea level and ice sheet variations R. DIETRICH
Earth rotation variation and its geodynamic causes E. GROTEN
Editors' and authors' address listNuméro de notice : 61213 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=44230 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 61213-01 CG.99 Livre Centre de documentation Congrès Disponible Report on the Symposium of the IAG Subcommission for Europe (EUREF) held in Prague, 2 - 5 June 1999 & reports of the EUREF Technical Working Group, EUREF Publication n° 8 / Erich Gubler (1999)
Titre : Report on the Symposium of the IAG Subcommission for Europe (EUREF) held in Prague, 2 - 5 June 1999 & reports of the EUREF Technical Working Group, EUREF Publication n° 8 Type de document : Actes de congrès Auteurs : Erich Gubler, Editeur scientifique ; Joao Agria Torres, Editeur scientifique ; International association of geodesy, Auteur ; H. Hornik, Editeur scientifique Congrès : EUREF 1999, symposium of the IAG subcommission for Europe (2 - 5 juin 1999; Prague), Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : BAW Astronomisch-Geodätische Arbeiten, ISSN 0340-7691 num. 60 Importance : 276 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9622-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes descripteurs IGN] EUREF
[Termes descripteurs IGN] Europe (géographie politique)
[Termes descripteurs IGN] European Terrestrial Reference FrameNuméro de notice : 11248 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34559 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 11248-01 CG.99 Livre Centre de documentation Congrès Disponible 11248-02 CG.99 Livre Centre de documentation Congrès Disponible
Titre : Segmentierung und Interpretation digitaler Bilder mit Markoff-Zufallsfeldern Titre original : [Segmentation and interpretation of digital images using Markov random fields] Type de document : Thèse/HDR Auteurs : J. Klonowski, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 492 Importance : 91 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9532-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes descripteurs IGN] analyse de groupement
[Termes descripteurs IGN] analyse texturale
[Termes descripteurs IGN] champ aléatoire de Markov
[Termes descripteurs IGN] distribution de Gibbs
[Termes descripteurs IGN] image multibande
[Termes descripteurs IGN] milieu urbain
[Termes descripteurs IGN] segmentation d'image
[Termes descripteurs IGN] théorème de Bayes
[Termes descripteurs IGN] varianceRésumé : (Auteur)This thesis defines and solves the problem of the interpretation of digital images by labeling processes on two levels based on Markov random fields. Under the assumption that the objects to be identified in the image differ by their textures, pixels are labeled at the low level according to their affiliation to classes of textures. Clusters of pixels with identical labels are forming regions. They are labeled at the high level of the image analysis to obtain the meaning of the objects. Uncertainties are considered by variances for the description of textures and objects as well as by the probabilistic approach for the labeling.
The textures at the low level are represented by the Gibbs distribution of the Markov random field for the gray values. Prior information on the labels concerning the textures is introduced by the Gibbs distribution of the Markov random field of the labels. Application of Bayes' theorem joins the two densities to the posterior distri-bution. Its maximization at every pixel yields the labels for the textures. Also on the basis of Markov random fields a description for the existing and the expected objects is obtained at the high level of image analysis. Prior information on the unknown object labels consists of the frequency of the occurence of objects and their neighborhood relations. Maximization of the posterior density leads to the labels. Uncertain interpretations of regions are found by posterior odds for hypotheses. The label "unknown" is attributed to them.
The quality of the interpretation is mainly influenced by the segmentation at the low level. Therefore an in-teraction between the two levels on the basis of posterior odds has been realized. The percentage of area of the regions labeled "unknown" is used as an indicator for improving the segmentation, which leads to a better result for the interpretation.
The texture classification is first investigated by generated data for a/ better judgement of the influences of the choice of the parameters for the distributions. The experience gained is used in the segmentation of real multispectral aerial photographs. Tests of a color transformation and an image pyramid of the image data with respect to the quality of the symbolic description of the image are following. Finally the interaction between the two interpretation levels is tested on aerial multispectral photographs of urban areas.Numéro de notice : 28003 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63350 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28003-01 35.20 Livre Centre de documentation Télédétection Disponible 28003-02 35.20 Livre Centre de documentation Télédétection Disponible
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 descripteurs IGN] compensation par bloc
[Termes descripteurs IGN] compensation par faisceaux
[Termes descripteurs IGN] Mars (planète)
[Termes descripteurs IGN] PathFinder
[Termes descripteurs IGN] réseau géodésique tridimensionnel
[Termes descripteurs IGN] valeur efficaceRésumé : (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 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 57824-01 31.20 Livre Centre de documentation En réserve 2S (M-103) Disponible PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalink
