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On the linearized boundary value problems of physical geodesy / B. Heck (1991)
Titre : On the linearized boundary value problems of physical geodesy Type de document : Monographie Auteurs : B. Heck, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1991 Collection : Department of Geodetic Science and Surveying Reports num. 407 Importance : 63 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] problème des valeurs limitesIndex. décimale : 30.43 Travaux de géodésie physique Numéro de notice : 12101 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54531 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12101-01 30.43 Livre Centre de documentation Géodésie Disponible Orthogonal functions over the oceans and applications to the determination of orbit error, geoid and sea surface topography from satellite altimetry / C. Hwang (1991)
Titre : Orthogonal functions over the oceans and applications to the determination of orbit error, geoid and sea surface topography from satellite altimetry Type de document : Monographie Auteurs : C. Hwang, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1991 Collection : Department of Geodetic Science and Surveying Reports num. 414 Importance : 229 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] fonction orthogonale
[Termes IGN] géoïde altimétrique
[Termes IGN] océan
[Termes IGN] orbite
[Termes IGN] surface de la merIndex. décimale : 30.04 Mathématiques appliquées à la géodésie Résumé : (Auteur) The goal of this study is to look for a set of orthogonal functions over the oceans and then to apply the functions to the expansions of oceanic signals. Ultimately these functions are incorporated in the parameter estimation problem using a model that simultaneously reduces satellite radial orbit errors, improves the geoid and estimates the sea surface topography.
To construct a possible set of orthogonal functions (over the oceans), three methods have been studied. In one method, an attempt was made to solve the spherical Helmholtz equation over the oceans with either the Dirichlet boundary condition or the Newmann Boundary condition or the mixed boundary condition. This method leads to successful developments of the spherical cap harmonics and generalized Fourier-Bessel series for some regularized oceanic domains. The other study employs the Shwarz-Christoffel conformal mapping, as well as an auxiliary mapping, to transform the irregular domain (the oceans) onto the interior of a unit disk where a set of orthogonal functions are easy to find. The set of orthogonal functions over the oceans are then found through the relationship between the two domains implied by the mappings. The third method involves the GramSchmidt process for which a new technique for computing the integrals of the products of two associated Legendre functions is developed and a FFT method is used to compute the inner products of spherical harmonics over the oceans. Also, for the entire unit sphere, the generalized 2-D Fourier series and the generalized Fourier-Tschebycheff series are proposed as alternatives for the spherical harmonics.
The expansions of the Levitus SST into the orthonormal functions constructed by the Gram-Schmidt process show that 98.5% of the energy of that signal is contained within degree 10 of the orthonormal functions. Such expansions also render regular spectral behavior of oceanic signal as compared to that from spherical harmonic expansions. A method of detecting band limited oceanic signal is also developed using these orthonormal functions. The applications of these functions to the simultaneous model yield lower correlation between expansion coefficients and show that the cut-off frequency (the highest degree determinable) of the SST from the Geosat data is in the vicinity of degree 15 of the functions. Some other improved simultaneous models have also been tested in an attempt to better separate the geoid and the SST signal. This study concludes that the orthonormal functions are suitable for representing oceanic signal with excellent spectral behavior and c be applied to future altimetric mission such as TOPEX/POSEIDON.Numéro de notice : 12114 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54542 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12114-01 30.04 Livre Centre de documentation En réserve M-103 Disponible Regular GRID DEM data compression by using zero-crossings / U. Chakreyavanich (1991)
Titre : Regular GRID DEM data compression by using zero-crossings : the automatic breakline detection method Type de document : Monographie Auteurs : U. Chakreyavanich, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1991 Collection : Department of Geodetic Science and Surveying Reports num. 412 Importance : 90 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] contour
[Termes IGN] détection de contours
[Termes IGN] extraction automatique
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] Triangulated Irregular NetworkIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) This report presents an automatic method of extracting Breaklines and Breakpoints from a set of regular grid DEM data. The regular DEM data are considered as an array of signal which can be convolved by the Laplacian of Gaussian (LoG) filter. It is found that points having positive maximum or negative minimum convoluted values (extremas) between zero-crossings of LoG are located at places critical for terrain description. The extremas, obtained by the proposed method correspond to breaklines and breakpoints of the terrain. These breakpoints and breaklines contain explicit information and have more meaning than regular grid points. Based on the concept of using breaklines and breakpoints as the terrain relief representation, the proposed technique can be considered as a DEM data compression process. This work shows that contour maps constructed from the extracted breaklines and breakpoints exhibit similar terrain roughness as the ones constructed from the full DEM data. The results justify the possibility of implementing this concept. Furthermore, breaklines and breakpoints obtained by this technique are almost identical to the ones manually collected by human operators. Numéro de notice : 12095 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54525 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12095-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Relational matching for stereopsis / O. Zilberstein (1991)
Titre : Relational matching for stereopsis Type de document : Monographie Auteurs : O. Zilberstein, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1991 Collection : Department of Geodetic Science and Surveying Reports num. 415 Importance : 123 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] appariement de formes
[Termes IGN] courbe épipolaireIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Extensive research has been carried out to understand stereopsis in order to solve the correspondence problem. The motivation for investigating the correspondence problem in digital photogrammetry is the fact that it is still far from being solved. The most prominent problems are relief distortions, occlusions, discontinuities in the surface (breaklines) and nonlinear radiometric differences. Applications such as large scale urban areas or close range scenes with a large depth range relative to the base/height ratio often pose unsurmountable problems to existing matching methods.
This work is concerned with solving the correspondence problem by using a relational de-scription of features rather than the features themselves. The objectives are to match signals derived from intensity values along epipolar lines, using as few constraints and assumptions as possible, and to determine as many conjugate points as possible. Moreover, the matching scheme should produce reliable results even if large numbers of geometric and radiometric distortions are present.
In this research, relational matching in the form of tree matching is used. To demonstrate the flexibility of the proposed matching scheme, two input signals were used. The first input consists of gray levels along epipolar lines used to match gray levels, and the second input involves convolution values used to match (indirectly) zerocrossings. Special attention was given to match scenes with large amounts of occlusions, foreshortening, and break lines and to use as few constraints as possible.
The results confirm the theoretical expectations that relational matching successfully copes with large geometric distortions without introducing special constraints or tuning the algorithm.Numéro de notice : 12111 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54540 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12111-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 12111-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Estimability of geodetic parameters from space VLBI observables / Jozsef Adam (1990)
Titre : Estimability of geodetic parameters from space VLBI observables Type de document : Monographie Auteurs : Jozsef Adam, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1990 Collection : Department of Geodetic Science and Surveying Reports num. 406 Importance : 108 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] interférométrie à très grande base
[Termes IGN] modèle mathématiqueIndex. décimale : 30.63 Télémétrie laser sur satellite, Télémétrie laser sur lune, VLBI Numéro de notice : 12097 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54527 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12097-01 30.63 Livre Centre de documentation Géodésie Disponible Radial orbit error reduction and sea surface topography determination using one year of Geosat altimeter data / Heiner Denker (1990)PermalinkThe development of the july 1989 1° x 1° and 30' x 30' terrestrial mean free-air anomaly data bases / J.H. Kim (1990)PermalinkThe role of the topography in gravity gradiometer reductions and in the solution of the geodetic boundary value problem using analytical downward continuation / Y.M. Wang (1990)PermalinkPrediction of polar motion from air and water excitations / J. Vondrak (1989)PermalinkA simulation study of the overdetermined geodetic boundary value problem using collocation / L. Tsaoussi (1989)PermalinkThe computation of detailed geoids using the fast Fourier transform method / S. Zhao (1989)PermalinkDetermination of local empirical convariance functions from residual terrain reduced altimeter data / P. Knudsen (1988)PermalinkDetermination of the gravity disturbance on the earth's topographic surface from airborne gravity gradient data / Y.M. Wang (1988)PermalinkDownward continuation of the free-air gravity anomalies to the ellipsoid using the gradient solution, Poisson's integral and terrain correction-numerical comparison and the computations / Y.M. Wang (1988)PermalinkTreatment of geodetic levelling in the integrated geodesy approach / Dennis G. Milbert (1988)PermalinkAfrican Doppler Survey 1981-1986 stations descriptions Volume 2 / Association africaine de cartographie (1987)PermalinkBaseline estimation from simultaneous satellite laser tracking / G.C. Dedes (1987)PermalinkGeoid undulation computations at laser tracking stations / V.K. Despotakis (1987)PermalinkProceedings of the International Conference on Earth rotation and the Terrestrial Reference Frame, July 31 - August 2, 1985, Colombus, Ohio, 1. Volume 1 / Ivan I. Mueller (1985)PermalinkProceedings of the International Conference on Earth rotation and the Terrestrial Reference Frame, July 31 - August 2, 1985, Colombus, Ohio, 2. Volume 2 / Ivan I. Mueller (1985)Permalink18th general assembly International Union of Geodesy and Geophysics (IUGG), Hamburg, FRG, August 15-27, 1983 : Proceedings of the International Association of Geodesy (IAG) symposia, Volume 1. The role of gravimetry in geodynamics & improved gravity field estimations on a global basis / Erwin Groten (1983)Permalink18th general assembly International Union of Geodesy and Geophysics (IUGG), Hamburg, FRG, August 15-27, 1983 : Proceedings of the International Association of Geodesy (IAG) symposia, Volume 2. Geodynamic aspects of Earth's rotation, the future of terrestrial and space methods for positioning, geodetic reference systems, strategies for solving geodetic problems in developing countries / Erwin Groten (1983)PermalinkOn the time delay weight matrix in VLBI geodetic parameter estimation / Yehuda Bock (1983)PermalinkImproved global prediction of 300-nautical mile mean free-air anomalies / J.Y. Cruz (1982)PermalinkThe use of baseline measurements and geophysical models for the estimation of crustal deformations and the terrestrial reference system / Yehuda Bock (1982)Permalink