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Affiner la recherche Interroger des sources externesIdentifizierung konsistenter Datengruppen am Beispiel der Kongruenzuntersuchung geodätischer Netze / Frank Neitzel (2004)
Titre : Identifizierung konsistenter Datengruppen am Beispiel der Kongruenzuntersuchung geodätischer Netze Titre original : [Identification de groupes de données cohérentes par l'exemple de l'étude de la congruence des réseaux géodésiques] Type de document : Thèse/HDR Auteurs : Frank Neitzel, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - C Sous-collection : Dissertationen num. 565 Importance : 148 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5004-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes descripteurs IGN] cohérence des données
[Termes descripteurs IGN] compensation de coordonnées
[Termes descripteurs IGN] congruence
[Termes descripteurs IGN] méthode des moindres carrés
[Termes descripteurs IGN] réseau géodésique
[Termes descripteurs IGN] transformation de coordonnées
[Termes descripteurs IGN] transformation de HelmertNote de contenu : 1) Einleitung und Uberblick
2) Koordinaten und Transformationen
3) Methoden der Parameterschätzung
4) Kongruenzuntersuchung geodätischer Netze
5) MSS - die Methode der Maximalen Untergruppe
6) SchussbetrachtungNuméro de notice : 13189 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54904 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13189-02 30.11 Livre Centre de documentation Géodésie Disponible 13189-01 30.11 Livre Centre de documentation Géodésie Disponible
Titre : ITRS combination center at DGFI : a terrestrial reference frame realization 2003 Type de document : Monographie Auteurs : Detlef Angermann, Auteur ; Hermann Drewes, Auteur ; M. Krugel, Auteur ; B. Meisel, Auteur ; Michael Gerstl, Auteur ; et al., Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 313 Importance : 141 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8593-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes descripteurs IGN] analyse comparative
[Termes descripteurs IGN] Global Geodetic Observing System
[Termes descripteurs IGN] International Terrestrial Reference Frame
[Termes descripteurs IGN] positionnement par DORIS
[Termes descripteurs IGN] positionnement par GPS
[Termes descripteurs IGN] positionnement par ITGB
[Termes descripteurs IGN] positionnement par télémétrie laser sur satellite
[Termes descripteurs IGN] repère de référenceNote de contenu : 1. Introduction and motivation
2. ITRS Combination Center at DGFI
3. Mathematical foundation
4. Input data for the TRF realization 2003
5. Intra-technique combination
6. Inter-technique combination
7. Current TRF accuracy
8. TRF computations : status, deficiencies and recommendations
9. Conclusions and outlookNuméro de notice : 13254 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54938 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13254-01 30.10 Livre Centre de documentation Géodésie Disponible 13254-02 30.10 Livre Centre de documentation Géodésie Disponible
Titre : Konzeption und Umsetzung eines Informationssystems zur geodätischen Deformationsanalyse Titre original : [Conception et réalisation d'un système d'information pour l'analyse des déformations géodésiques] Type de document : Thèse/HDR Auteurs : J. Zimmermann, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - C Sous-collection : Dissertationen num. 574 Importance : 104 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5013-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes descripteurs IGN] compensation
[Termes descripteurs IGN] covariance
[Termes descripteurs IGN] déformation géométrique
[Termes descripteurs IGN] données géodésiques
[Termes descripteurs IGN] interface utilisateur
[Termes descripteurs IGN] modèle orienté objet
[Termes descripteurs IGN] UMLRésumé : (Auteur) This work describes the conception and realisation of an information system for geodetic deformation analysis. The data flow in the context of a geodetic deformation analysis is presented and its implementation in available software is described. Problems that arise when using the listed software to accomplish the data flow are shown and used to define the demands for the information system. Because the demands can be fulfilled using object-oriented modeling techniques and appropriate long term storage systems e.g. database systems, these are mentioned as well. In the course of the system description the different components are presented. In the case of the long term storage the realised persistence mechanism is introduced. The demands for potential persistent classes and the functionality of the persistence mechanism are explained as well. Each level of the data flow is capsuled in a separate component whereby many realisations for each level can exist. In association with the adjustment of geodetic networks a method to capsule the functional models for the various observations is shown. This encapsulation leads to greater exchangeability, flexibility and extensibility. Furthermore it is shown how the algorithms for network equalisation can be constructed to be independent of concrete observations and how the various algorithms can be furnished with a common interface to integrate them into the system. In the context of realising the algorithms for the geodetic deformation analysis a common interface for handing over data to the various types of analyses is presented. The algorithms for three static deformation analyses are realised in separate components. The realisation of a prototype is described as well as first impressions on using the prototype. Finally the initial demands and their realisations are reflected and possibilities for system extensions are pointed out. Numéro de notice : 13204 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54914 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13204-01 30.60 Livre Centre de documentation Géodésie Disponible 13204-02 30.60 Livre Centre de documentation Géodésie Disponible
Titre : Modellierung von Oberflächen mit Diskontinuitäten Titre original : [Modélisation des superficies avec des discontinuités] Type de document : Thèse/HDR Auteurs : Andrzej Borkowski, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - C Sous-collection : Dissertationen num. 575 Importance : 91 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5014-3 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes descripteurs IGN] contour
[Termes descripteurs IGN] données laser
[Termes descripteurs IGN] lasergrammétrie
[Termes descripteurs IGN] lissage de données
[Termes descripteurs IGN] modèle numérique de terrain
[Termes descripteurs IGN] semis de points
[Termes descripteurs IGN] vectorisationRésumé : (Auteur) The laser scanning provides very dense information about the surface to be modelled in the form of a irregularly distributed points cloud {x, y, z} c R3. Such dense information makes possible an efficient modelling of characteristic structures of the terrain surface like discontinuities, which are necessary for high-qualitative description of the surface. Simultaneously, the points not belonging to the modelled surface (for example: reflexes from buildings, trees etc.) stand a very important influence on the obtained data. During the modelling process, such data should be effectively filtered from the whole data set.
The laser scanning data can be efficiently elaborated by the use of deformable models of curves and surfaces. These models base on the physical principle of energy-minimizing and are presented as the solution of variational problem. The total energy consists both of internal and external energy. The external energy, depending on a context is generated by the data; in most cases it describes a deviation between the data and a model. The internal energy describes geometrical properties of curves and is characterized by elasticity and viscosity. Both terms are mutually weighted by the local control parameters a and 0. Varying the parameters makes it possible to stretch the curves to a geometrical shapes. The snake-approximation is used for a profiled modelling of surfaces. Due to that, a formulation of external energy was proposed making possible a robust modelling of profiles: during an iterative process, gross errors can be filtered, measuring errors can be smoothed and discontinuities can be preserved. Fitting the snakes-models to the data runs iteratively, however the control parameters depending on the data are being spread.
By generalizing the snakes, the model is introduced by sufficient smoothes, energy-charged pieces of a surface and furthermore described by flakes. The internal energy within the flakes model consists of a membrane and a thin-plate kernel which describes the inclination and curvature properties of the modelled terrain surface. The energy pieces will furthermore be weighted by the local control parameters a and fl. A minimizing of the total flakes energy leads again to the variational problem which had been differently solved. By formulate the Euler equations and their further diskretizing by finite differences, the flakes-model stands for regular data. The previous variational problem will also be solved by the use of so-called Ritz method. The improved flakes model was developed for regular data by using a linear base function. However, for the irregular data the flakes model was modified by the use of a Gaussian function. The modelling of the data by flakes runs iteratively. By using the flakes model for regular data it is possible to reject the gross errors, also to smooth the noise by simultaneous preserving the form of edges.
In many applications the information about spatial location of terrain edges is needed. To present such spatial location description of edges in a vector format based on irregular points cloud {x, y, z} obtained during laser scanning, it was proposed to describe a gross-errors-free data by surface functions and to average the edges as a intersection of two surfaces zi = fi(x, y) ; i = 1, 2. To this purpose, all the data should furthermore be ordered in separate pieces of the surface. This problem can be solved by using the standard methods of image processing. The projection {x(s), y(s)} of edges is found in the xy coordinate plane and the z-coordinates consist of fi (x(s), y(s)). To the intersection of two surfaces relates: f1 (x(s), y(s)) = f2 (x(s), y(s)) = 0. Based on this condition, two approaches of intersection curve identification were developed. The line-tracking algorithm relies on numerical integration of differential equations relative to the particular problem. For the numerical integration there is a starting point needed. Due to that, a seeking-approach was proposed. Opposite to the local algorithm it was presented a global approach using a snakes-method with a proper definition of external energy. Both algorithms make it possible a reliable, high-accurate identification of terrain edges basing on irregular points cloud.
The algorithms and approaches developed in this work have been tested on real data sets obtained by a laser scanning. Furthermore, a qualitative consideration of a modelling has been given. Finally, some hints for user according the steering and operating of the approaches have been presented.Numéro de notice : 13256 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54940 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13256-01 35.20 Livre Centre de documentation Télédétection Disponible
Titre : Simultane Schätzung von Topographie und Dynamik polarer Gletscher aus multi-temporalen SAR Interferogrammen Titre original : [Simultaneous estimation of topography and motion of polar glaciers and ice sheets from multi-temporal SAR interferograms] Type de document : Thèse/HDR Auteurs : F.J. Meyer, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - C Sous-collection : Dissertationen num. 579 Importance : 113 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5018-1 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes descripteurs IGN] Arctique
[Termes descripteurs IGN] calotte glaciaire
[Termes descripteurs IGN] glacier
[Termes descripteurs IGN] image multitemporelle
[Termes descripteurs IGN] image radar moirée
[Termes descripteurs IGN] interferométrie différentielle
[Termes descripteurs IGN] interféromètrie par radar à antenne synthétique
[Termes descripteurs IGN] position directeRésumé : (Auteur) This thesis presents a new technique to simultaneously estimate topography and motion of polar glaciers and ice sheets from multi-temporal SAR interferograms. In this approach the unknown parameters, i.e. topography and surface displacement, are estimated from a redundant number of observations. The resulting redundancy is systematically used to attach realistic accuracy and robustness measures to all estimated unknowns and to reveal possible gross errors in the observations or errors in the model. Additionally, the redundancy facilitates replacing very restrictive model components by more flexible models with a higher amount of free parameters. This leads to a better description of the real behavior of the object.
The approach combines several SAR interferograms into a least-squares adjustment based on the Gauss-Markov model. In order to connect the multi-temporal data sets, a spatio-temporal model is proposed that describes the properties of the surface and its temporal evolution. The parameterization of the model can be adapted considering the properties of the object under investigation. Tests with simulated data show that, with this technique, both topography and motion of polar ice caps can be estimated with an accuracy of a few meters or a few centimeters per day, depending on the configuration of the adjustment. The quality of the estimated parameters depends on the accuracy of the phase observations, the observation geometry, and the number of involved data sets. Analyses of the robustness of the approach additionally indicate a high robustness of the estimated unknowns with respect to gross errors in the observations. The influence of the atmospheric path delay on the unknowns is analyzed and quantified for various observation geometries and different atmospheric conditions. It is shown that errors in the assumed deformation model significantly falsify the estimated parameters. Thus, the configuration of the spatio-temporal model must be chosen carefully. In addition to the estimation of surface topography and motion, the method and its inherent analysis tools allow to determine the observation geometry that is necessary to reach a pre-defined accuracy level in advance. Therefore, the method is a very useful tool for project planing. By means of a case study aimed at the observation of a huge ice dome in the Russian arctic the feasibility of the approach in real-life situations is demonstrated.Numéro de notice : 13257 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54941 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13257-01 35.45 Livre Centre de documentation Télédétection Disponible 13257-02 35.45 Livre Centre de documentation Télédétection Disponible PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkNational report of the Federal Republic of Germany on the geodetic activities in the years 1999-2003 [for] XXIII [23rd] general assembly of the International Union for Geodesy and Geophysics (IUGG) 2003 in Sapporo, Japan / B. Heck (2003)
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