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Modellbildung, Berechnungsstrategie und Beurteilung von Vertikalbewegungen unter Verwendung von Präzisionsnivellements / K. Zippelt (1988)
Titre : Modellbildung, Berechnungsstrategie und Beurteilung von Vertikalbewegungen unter Verwendung von Präzisionsnivellements Titre original : Kinematic Models, Determination and Interpretation of Recent Vertical Movements Based on the Analysis of Repeated Levellings Type de document : Thèse/HDR Auteurs : K. Zippelt, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1988 Collection : DGK - C Sous-collection : Dissertationen num. 343 Importance : 155 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9391-1 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Nivellement
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] erreur systématique
[Termes IGN] matrice de covariance
[Termes IGN] modèle de déformation tectonique
[Termes IGN] modèle stochastique
[Termes IGN] nivellement
[Termes IGN] République fédérale d'Allemagne
[Termes IGN] réseau altimétrique local
[Termes IGN] série de TaylorIndex. décimale : 30.50 Nivellement - généralités Résumé : (Auteur) At present the determination of recent vertical movements is based on the analysis of repeated level!ings. These are scattered in time and inhomogeneously placed in the design. For their analysis, only a kinematic model will be suitable to give reliable estimations of height changes. The height of each point in the network as well as the observed height differences can be considered to be time-dependent. After a review of different methods in determining vertical movements, a taylor series is assumed as the base of the single-point-model presented in two forms and discussed in detail. The single-point-model is combined with different adjustment and datum models and it is developed into a mixed model in order to separate the rates of movements in parts of trend and noise. To complete the so-called "Karlsruhe Approach" the stochastic model of observed height differences is considered. With regard to well known levelling errors several possibilities to improve the stochastic model are described. This is done to get the best possi-ble estimation of vertical movements. Finaly features of computing in the functional model and in the datum lead to the application of a special sparse-technique which enables to adjust large networks.
Based on all these considerations, a rigorous strategy including different adjustment models in four steps is developed. Statistical tests are executed to indicate the best model. In the first step the measurements are investigated to detect outliers in the data and to get a first view of the accuracy of the measurements. In the second step the kinematic and stochastic model is gene-rated using statistic methods and the judgement of the kovariancematrix of the unknowns. The fi-nal model is obtained in the third step applying a "weak" datum. The estimation of the junction-network is verified by evaluation of each single levelling line using a kinematic model, too. In the forth step the estimated rates of vertical movements are presented in different maps of con-tour lines. They are analysed to characterize the stochastic behaviour and to separate in trend rates and such of local noise. The analysis by deformation parameters, especially the horizontal gradient, describes the tilt included in the movements and gives information independent of the used datum.
Using the developed strategy, a levelling network covering south-west Germany is analysed and the results are presented in detail. It is shown that most of the estimated values of recent mo-vements are not significant in a statistical sense. The considerations of a point disturbance in the junction points and such of a systematic scale error lead to an improvement of the estima-tion in the adjustment. Although the presented movements are not significant, different trends are recognizable and are discussed.Numéro de notice : 58689 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60421 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 58689-01 30.50 Livre Centre de documentation Géodésie Disponible Rattachement de marégraphes au système géodésique mondial BTS par les systèmes GPS et Doris / Pascal Willis (1988)
Titre : Rattachement de marégraphes au système géodésique mondial BTS par les systèmes GPS et Doris Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Claude Boucher
, Auteur
Editeur : Paris, Meudon et Nançay : Observatoire de Paris Année de publication : 1988 Conférence : JSRST 1988, Journées systèmes de référence spatio-temporels 20/06/1988 21/06/1988 Paris France Importance : 26 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] marégraphe
[Termes IGN] positionnement par DORIS
[Termes IGN] positionnement par GPS
[Termes IGN] rattachement de station
[Termes IGN] système terrestre du BIHIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Numéro de notice : 21064 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64435 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21064-01 30.10 Tiré à part Centre de documentation Géodésie Disponible 21064-02 30.10 Tiré à part Centre de documentation Géodésie Disponible
Titre : Le réseau géodésique français Type de document : Monographie Auteurs : Claude Boucher , Auteur
Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1988 Collection : Publications techniques en géodésie Sous-collection : Notes techniques num. 27494 Importance : 23 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] Réseau Géodésique FrançaisIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Numéro de notice : 12196 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54577 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12196-01 30.10 Livre Centre de documentation Géodésie Disponible 12196-02 30.10 Livre Centre de documentation Géodésie Disponible 12196-03 7D Livre SGM K001 Exclu du prêt
Titre : The integration of GPS heights into the Australian Height Datum Type de document : Monographie Auteurs : R.D. Holloway, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1988 Collection : Unisurv Report num. S-33 Importance : 152 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-0-85839-051-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] altitude orthométrique
[Termes IGN] Australie
[Termes IGN] méthode des moindres carrés
[Termes IGN] nivellement par GPS
[Termes IGN] réseau de nivellement
[Termes IGN] système de référence altimétriqueIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Résumé : (Auteur) The Global Positioning System (GPS) is being used to determine ellipsoidal height differences (h) over baselines by organisations who are attracted to its efficiencies in use and accuracy of results compared to conventional surveying techniques. For these heights to be physically meaningful they must be integrated into the Australian Height Datum (AHD) to be compatible with other spirit levelled heights (H). The GPS heights are referred to the reference ellipsoid of the satellite system whilst the reference surface of the AHD is observed mean sea level at 30 tide gauges around the Australian coastline being a close approximation of the geoid. The difference between the two surfaces at a point is the geoid-ellipsoid separation (N), or more commonly and more accurately, the difference in the geoid-ellipsoid separation (N) when expressed over a baseline.
This study investigates the three components of the equation used to transform GPS heights into the AHD,
H = h - N and finds that,
* heights in the AHD should be referred to as normal orthometric heights because normal gravity is used in the orthometric correction,
* heights in the AHD are referred to a warped surface not coincident with the geoid or any other equipotential surface because the levelling was adjusted between the mean sea level heights at 30 tide gauges around the Australian coastline,
* the difference between mean sea level and the geoid at each tide gauge station is equal to the sea surface topography at the tide gauge,
* there is a high probability that compensating gross errors in heights remain undetected in some levelling loops.
The principal systematic error sources in the GPS heights were found to be,
* the troposphere delay error,
* the a priori coordinates of the fixed station,
* the residual ionosphere delay error,
* errors in the satellite ephemerides.
Simulation studies show that with an appropriate observation and computation strategy the precision of GPS heights is 2-4 ppm. It was also found that there was no benefit in resolving the cycle ambiguities because the heights were not improved if the integer ambiguities were solved for correctly, which must be weighed against the risk of degrading the heights if the ambiguities are resolved incorrectly.
The precision requirements for the computation of the geoid-ellipsoid height differences vary with the application and the remoteness of the location. For the most precise heighting applications it is necessary to compute N to the same precision as that of the GPS heights. The methods investigated in this study include,
* geometrical methods such as contouring N values and analytically fitting a plane surface to height control points,
* using high order geopotential models such as OSU81, GPM2 and OSU86E,
* using ring integration (RINT), which uses a high order geopotential model combined with integration of the local gravity field using Stokes' formula.
Each of these methods is evaluated by computing N in two GPS observed networks, one in Western Australia and the other in South Australia. The relative precision of the results and complexity of computation are compared. It was found that GPS heights can be integrated into the AHD without loss of accuracy and that GPS heighting is a viable alternative to spirit levelling for all but the most accurate applications.Numéro de notice : 63136 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61179 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 63136-01 30.10 Livre Centre de documentation Géodésie Disponible
Titre : Theoretische Untersuchungen zum Einsatz von Industriemeßsystemen Titre original : A Theoretical Analysis of Industrial Triangulation Systems Type de document : Thèse/HDR Auteurs : Rudolf Staiger, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1988 Collection : DGK - C Sous-collection : Dissertationen num. 340 Importance : 148 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9388-1 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] compensation par faisceaux
[Termes IGN] données localisées 3D
[Termes IGN] optimisation (mathématiques)
[Termes IGN] réseau de premier ordre
[Termes IGN] temps réel
[Termes IGN] triangulation (méthode de mesure)Index. décimale : 30.10 Systèmes de référence et réseaux géodésiques Résumé : (Auteur) The subject of the research presented in this thesis is an investigation of three-dimensional intersection, as applied to industrial measurement Systems. Such Systems consist of at least two electronic theodolites connected directly to a computer. Since data is recorded fully automatically, real-time triangulation is possible.
Firstly, the relevant computational models for close-range intersection are examined and a rigorous three-dimensional adjustment is discussed in detail. A two-step procedure for real-time triangulation is then developed, which is based on a sequential network adjustment. This enables observations to be immediately processed without the need to invert the full normal matrix. The result is a strictly correct mathematical solution for the current network. The treatment of theodolite observations by a photogrammetric bundle adjustment is also briefly discussed.
Secondly, some additional aspects of instrumentation and setting-up procedures are evaluated. Particular attention is given to reciprocal observation and the determination of the horizontal and vertical separation of the theodolites.
Analysis and optimisation of three-dimensional intersection is presented in a number of detailed steps. The most appropriate method for the zero order design (selection of datum) is a free-net adjustment, which minimizes the trace of the object points only. The greatest scope for optimising the network exists in the first order design (network configuration). After an examination of errors in the base-length, an analytical technique for selecting an optimal network is explained. This suggests a new method of executing observations, in which the theodolites are positioned vertically above one another, rather than in the horizontal plane. Second order design (selection of observational weights) has no real importance for three-dimensional intersection. In contrast, significant improvements are possible in third order design with the aid of additional theodolite positions and/or additional scale lengths.Numéro de notice : 28106 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63453 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28106-01 30.10 Livre Centre de documentation Géodésie Disponible 28106-02 30.10 Livre Centre de documentation Géodésie Disponible PermalinkCombined control densification and mapping / M.M. Ethridge in Photogrammetric Engineering & Remote Sensing, PERS, vol 53 n° 6 Tome 1 (june 1987)
PermalinkPermalinkPermalinkPermalinkDes systèmes d'altitudes : (2ème partie) idée d'une représentation / Patrick Charlot in Géomètre, vol 1987 n° 3 (mars 1987)
PermalinkAdjusting the SW Finland triangular network using the tagnet 3D operational geodesy software / Erik W. Grafarend (1987)
PermalinkAfrican Doppler Survey 1981-1986 stations descriptions Volume 2 / Association africaine de cartographie (1987)
PermalinkAstro-geodetic deflections of the vertical at first-order triangulation stations / Markku Ollikainen (1987)
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