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Modelle und Algorithmen für das Facetten-Stereosehen / M. Weisensee (1992)
Titre : Modelle und Algorithmen für das Facetten-Stereosehen Titre original : [Modèles et algorithmes pour la vision stéréo à facettes] Type de document : Thèse/HDR Auteurs : M. Weisensee, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - C Sous-collection : Dissertationen num. 374 Importance : 111 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9421-5 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie
[Termes IGN] espace image
[Termes IGN] espace objet
[Termes IGN] interpolation bilinéaire
[Termes IGN] modèle mathématique
[Termes IGN] vision stéréoscopiqueIndex. décimale : 33.00 Photogrammétrie - généralités Numéro de notice : 60651 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60780 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 60651-01 33.00 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 60651-02 33.00 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Modellierung geometrisch-topologischer Daten zur Beschreibung und Berechnung netzartiger und flächenhafter Strukturen / M. Neureither (1992)
Titre : Modellierung geometrisch-topologischer Daten zur Beschreibung und Berechnung netzartiger und flächenhafter Strukturen Titre original : [Modélisation de données géométriques et topologiques pour la description et le calcul de structures en réseau et assimilées à une surface] Type de document : Thèse/HDR Auteurs : M. Neureither, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - C Sous-collection : Dissertationen num. 387 Importance : 204 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9433-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Analyse mathématique
[Termes IGN] arbre (mathématique)
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle sémantique de données
[Termes IGN] optimisation (mathématiques)
[Termes IGN] réseau
[Termes IGN] triangulation (topologie)Résumé : (Auteur) In this thesis a general concept for the computational treatment of geometrical network and surface structures is described. The realization of the concept for typical engineering applications in geodesy, civil engineering and architecture is shown.
The first part of the thesis contains a general modelling of geometrical and topological network and surface data as well as a systematization of computational network and surface operations. The im--portance of efficient data structure supporting the operations becomes obvious.
In the second part several different applications based on the general model for network and surface structures are presented: the computational process of formnnding for cable networks, the computer-aided definition of cutting patterns for membrane structures, a digital surface model based on trian--gular networks, the numerical generation of tree branching structures, the computational analysis of path systems in human settlements and the optimization of parcel systems for planning purposes.Numéro de notice : 28084 Affiliation des auteurs : non IGN Thématique : MATHEMATIQUE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63431 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28084-01 23.30 Livre Centre de documentation Mathématiques Disponible Neue Verfahren zur Kombination heterogener Daten bei der Bestimmung des Erdschwerefeldes / B. Middel (1992)
Titre : Neue Verfahren zur Kombination heterogener Daten bei der Bestimmung des Erdschwerefeldes Titre original : [Nouveaux procédés pour la combinaison de données hétérogènes lors de la détermination du champ de pesanteur terrestre] Type de document : Thèse/HDR Auteurs : B. Middel, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - C Sous-collection : Dissertationen num. 395 Importance : 124 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9441-3 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] collocation
[Termes IGN] erreur systématique
[Termes IGN] harmonique sphérique
[Termes IGN] méthode robuste
[Termes IGN] potentiel de pesanteur terrestreIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur)New techniques for the combination of heterogenous data when determing the Earth's gravity field
A fundamental problem for the modulation of the Earth's gravity field is the combination of very different pieces of information in an adequate way.
Within this thesis a concept for the solution of this task is developed in which the idea of robust collocation, based on a Random Effects Model, is generalized. With the predictors multi hom-BLUP and mixed BLUP two approaches are presented where the influence of possible systematic errors in the data set, being interpreted as stochastic prior information, can be reduced. In order to judge the different combination solutions a statistic test strategy is developed.
These new techniques are numerically tested by means of an expansion of the Earth's gravitational potential in spherical harmonics based on terrestrial gravity data and satellite orbit information. Due to the robustification very homogenous combination solutions can be obtained by the use of the predictors developed within this thesis; they turn out to be superior when compared with the traditional approaches.Numéro de notice : 28082 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63429 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28082-01 30.40 Livre Centre de documentation Géodésie Disponible Optimierung geodätischer Netze mit spektralen Zielfunktionen / H. Kaltenbach (1992)
Titre : Optimierung geodätischer Netze mit spektralen Zielfunktionen Titre original : [Optimisation des réseaux géodésiques par les fonctions spectrales recherchées] Type de document : Thèse/HDR Auteurs : H. Kaltenbach, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - C Sous-collection : Dissertationen num. 393 Importance : 116 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9439-0 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse spectrale
[Termes IGN] canevas
[Termes IGN] itération
[Termes IGN] matrice de covariance
[Termes IGN] mire parlante
[Termes IGN] problème inverse
[Termes IGN] réseau géodésique
[Termes IGN] système de coordonnées
[Termes IGN] système non linéaire
[Termes IGN] valeur propreIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Résumé : (Auteur) The following thesis deals with the optimization of geodetic networks based on spectral target functions. The spectral analysis and optimization is based on the decomposition of the normal equation matrix of the adjustment or on the covariance matrix of the coordinates in the system of eigenvalues and eigenvectors. Chapter two contains some important mathematical background knowledge from the field of direct and inverse eigenvalue problems and the iterative solution of nonlinear systems of equations. Especially some properties of the newton-procedure are discussed, because this method is generally used to solve inverse eigenvalue problems. To apply the Newton-procedure it is necessary to know the derivatives of the eigenvalues and vectors of the considered matrix with respect to the design parameters. The derivatives of an arbitrary (symmetric) matrix are summarized in this chapter.
The spectral analysis of geodetic networks related to aspects of precision and reliability is the subject of chapter three. Some wellknown local and global measures for the precision are summarized shortly. Aspects concerned with the so-called inner geometry of a network and the definition of the coordinate system (datum problem) are mentioned and supplemented by examples.
The optimization with target functions related to the eigenvalue spectrum is the main part of this thesis and the subject analyzed in detail in chapter four. Principally spoken the task is to determine the coordinates of the netpoints and the observation weights in such a manner that the resulting normal equation or covariance matrix has a special target spectrum. This is the definition of the inverse eigenvalue problem. Based on a given start design of a geodetic network the target function is formulated and the inverse eigenvalue problem is solved iteratively. As mentioned above it is necessary to know the derivatives of the eigenvalues with respect to the coordinates and the observation weights. The derivatives can be computed based on the eigenvalue problem for the normal equation matrix or the covariance matrix and furthermore it is necessary to calculate the derivatives of the elements of the normal equation matrix analytically. Problems arising in network optimization like handling the orientation unknowns in direction networks or the consideration of inner geometry and datum definition of a network are discussed. Examples show the effectiveness of the optimization procedure and show how the so-called weak form of geodetic networks can be reduced. The spectral network optimization is a useful tool for understanding properties and behaviour of geodetic networks. The spectral formulation with target eigenvalues allows the solution of first, second and third order design problems in the usual classification of network optimization. The examples are also used to investigate the properties of the iterative solution procedure, especially the rate of convergence or the definiteness of solutions.
In analogy to the eigenvalues, one can define an inverse eigenvector problem : the task is to determine the design parameters -namely the coordinates and the observation weights - in such a way that the normal equation matrix has given eigenvectors. The formulation of solution procedures and the difficulties in formulating suitable target functions for eigenvectors is the topic of chapter five. One application of this topic is the field of deformation analysis, where the task is to achieve the components of the dominant eigenvector in such a manner that they are perpendicular to. the expected direction of the deformations.
To make an algorithm for network optimization a suitable tool in network planning, it is inevitable to consider some practical aspects. In the first order design, namely the determination of the coordinates of the netpoints, it is obvious that the rate of displacement of the points is limited by the local topography. One cannot move the points arbitrarily without loosing connections between the points. Therefore it is obvious to introduce the possible rate of displacement of the points as restrictions into the optimization algorithm. The same is valid for the observation weigths in a weight optimization (second order design). To take into account aspects of reliability we have to formulate upper bounds for the weights because observations with very high weights compared with other observations usually have low redundancy. Therefore in the adjustment gross errors can be found with a low probability, but unknown errors can distort the results significantly. If we take into account these practical aspects within the iterative solution procedure of the inverse eigenvalue problem we get a problem of minimizing a certain target function with additional restrictions in the form of equations and unequations. There are several methods in optimization theory for solving such problems. Chapter six of the present thesis deals with this topic. Again examples are used to supplement the theoretical investigations.Numéro de notice : 61414 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60937 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 61414-01 30.10 Livre Centre de documentation Géodésie Disponible 61414-02 30.10 Livre Centre de documentation Géodésie Disponible Relativistic motion of gyroscopes and space gradiometry / E. Gill (1992)
Titre : Relativistic motion of gyroscopes and space gradiometry Type de document : Monographie Auteurs : E. Gill, Auteur ; Michael Soffel, Auteur ; H. Ruder, Auteur ; Monique Schneider, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - A Sous-collection : Theoretische Geodäsie num. 107 Importance : 82 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8189-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] champ de gravitation
[Termes IGN] corps céleste
[Termes IGN] équation de Hamilton-Jacobi
[Termes IGN] force d'inertie
[Termes IGN] gradiométrie
[Termes IGN] gyroscope
[Termes IGN] linéarisation
[Termes IGN] mécanique céleste
[Termes IGN] métrique
[Termes IGN] précession
[Termes IGN] système Terre-LuneIndex. décimale : 30.60 Géodésie spatiale Résumé : (Auteur) Relativistic effects in the motion of freely falling test particles moving along circular orbits in the exterior gravitational field of a spherically symmetric, slowly rotating or slightly oblate body are considered. To this end we solve the geodesic equation in the (parametrized) post-Newtonian metric, the linearized Kerr metric and the linearized Erez-Rosen metric, respectively.
The main part of this article deals with the "pseudo-Newtonian resonances" found by MASHHOON and THEISS (1982-1986) in the motion of torque-free gyroscope axes, moving along inclined orbits in the gravitational field of a rotating mass. In relativistic spin motion and gradiometry these "resonances" should lead to new effects on time scales, comparable or large to the Fokker period. In this regime, it was argued, the usual post-Newtonian approximation should break down. However, solving the equations of parallel transport in the first post-Newtonian approximation, we show that the Mashhoon-Theiss "anomaly" appears already at this level and can be explained as arising from a simple interplay between Fokker (geodetic) and Schiff (Lense-Thirring) precession. For these reasons the Mashhoon-Theiss "anomaly" represents no new anomalous relativistic effect, but can be understood by means of the usual post-Newtonian formalism. Considering the motion of some torque-free gyroscope along circular orbits with small inclination in the gravitational field of an oblate body, where according to THEISS (1985b) similar relativistic resonances should appear, we show that no new interesting relativistic effects occur in that case.
To investigate relativistic effects in space gradiometry we calculate the relativistic tidal forces in a local inertial system, using the previously derived results for geodesic and spin motion. According to the development of high precision superconducting satellite gradiometers the measurement of gravito-magnetic effects of the Earth's rotation may in principle be achieved in the near future. Analyzing the motion of the Earth-Moon system in the gravitational field of the rotating Sun, we find that gravito-magnetic effects can be neglected. Especially, taking into account the Newtonian precession of the Moon's orbit the Mashhoon-Theiss "anomaly" leads to a variation of the Earth-Moon distance with amplitude 0.4 /µm, in contrast to the results of Mashhoon and Theiss of 1.4 m (MASHHOON et al. 1986). Relativistic effects of the quadrupole moment of the central field can be neglected in satellite gradiometry and the motion of the Earth-Moon system, respectively.Numéro de notice : 40655 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=57824 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 40655-01 30.60 Livre Centre de documentation Géodésie Disponible Report on the Symposium of the IAG Subcommission for the European Reference Frame (EUREF) held in Florence 28-31 May 1990 & report on the working session of the IAG Subcommission for the European Reference Frame (EUREF) held in Vienna 14-16 August 1991 & report on the Symposium of the IAG Subcommission for the European Reference Frame (EUREF) held in Berne 4-6 March 1992, EUREF publication n° 1 / Erich Gubler (1992)PermalinkUntersuchungen verschiedener Höhensysteme, dargestellt an einer Testschleife in Rheinland-Pfalz / M. Leismann (1992)PermalinkZur Integration von Vektor- und Rasterdaten in Geo-Informationssystemen / H. Yang (1992)PermalinkAnalyse von Lasermessungen zum Mond im Rahmen einer post-Newton'schen Theorie / J. Muller (1991)PermalinkAufbau eines geodätischen Strapdown Inertialsystems zur Punktbestimmung / D. Keller (1991)PermalinkEin klassifizierender Beitrag zur Abbildungstheorie und numerischen Genauigkeit von geodätischen Datumsübergängen / R. Schreiber (1991)PermalinkEin Verfahren zur Rekonstruktion von dreidimensionalen Objektmodellen aus digitalen Bilddaten / B. Straub (1991)PermalinkEine analytische Lösung kanonischer Gleichungen der geodätischen Linie zur Transformation ellipsoidischer Flächenkoordinaten / J. Klotz (1991)PermalinkEine approximative Lösung der fixen gravimetrischen Randwertaufgabe im Innen- und Außenraum der Erde / J. Engels (1991)PermalinkEphemeridenrechnung und Bahnbestimmung geostationärer Satelliten mit Hilfe der Taylorreihenintegration / Oliver Montenbruck (1991)Permalink