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Compte-rendu de l'activité du GRGS pour l'année 1987 / Claude Boucher (1988)
Titre : Compte-rendu de l'activité du GRGS pour l'année 1987 Type de document : Rapport Auteurs : Claude Boucher , Auteur ; Groupe de recherche de géodésie spatiale, Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1988 Importance : 83 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] géodésie spatiale
[Termes IGN] géoïde
[Termes IGN] géophysique
[Termes IGN] géopositionnement
[Termes IGN] gravimétrie
[Termes IGN] Groupe de recherches de géodésie spatiale
[Termes IGN] lithosphère
[Termes IGN] satellite artificiel
[Termes IGN] tectonique
[Termes IGN] télémétrie laser sur la LuneNuméro de notice : 57436 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Rapport d'activité Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=43924 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 57436-01 RO.87 Livre Centre de documentation En réserve M-103 Disponible Dynamische Analyse geodätischer Netze auf der Basis von GPS-Phasenbeobachtungen / W. Lindlhor (1988)
Titre : Dynamische Analyse geodätischer Netze auf der Basis von GPS-Phasenbeobachtungen Titre original : [Analyse dynamique des réseaux géodésiques sur la base d'observations des phases de satellites GPS] Type de document : Thèse/HDR Auteurs : W. Lindlhor, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1988 Collection : DGK - C Sous-collection : Dissertationen num. 346 Importance : 155 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9394-2 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] champ de vitesse
[Termes IGN] compensation par moindres carrés
[Termes IGN] données GPS
[Termes IGN] modèle de Gauss-Markov
[Termes IGN] modèle stochastique
[Termes IGN] phase GPS
[Termes IGN] réseau géodésique
[Termes IGN] tectonique des plaquesIndex. décimale : 30.82 Applications géophysiques de géodésie spatiale Résumé : (Auteur) It is the aim of the present work to characterize the use of the application of originally undifferenced carrier beat phases being emitted from Navstar/Global Positioning System (GPS) satellites. This includes the determination of coordinates, coordinate differences and baseline lengths by a dynamical analysis of geodetic networks, as well as the analysis and interpretation of the displacement field and its related deformation elements at the earth's surface. All network points are considered as changeable und no more fixed quantities. The investigations are based on a proper division of the displacement field into global, regional, and local parts. The global and regional effects have to be reduced before the local parts can be investigated. Besides the conventional Gauß-Markov-Model a Mixed Model is used as an alternative mathematical basis for the adjustment process. The parameters in the Gauß-Markov-Model are estimated from the method of weighted least squares in the sense of a best linear unbiased estimation (BLUE). In contradiction to this the parameters in the Mixed Model are predicted by using stochastic prior information. We apply a generalized target function and three different prediction methods. The best inhomogeneously linear prediction (inhom-BLIP) possesses the matrix of minimal mean square prediction errors. The best homogeneously linear unbiased prediction (hom-BLUP) is characterized by its robustness against bad or incorrect prior information. With the help of simulated data sets and real observations for the GPS carrier phases the applicability of the phase measurements for analyzing and interpreting the local displacement field and local deformations is demonstrated. All real measurements have been delivered by the Wild-Magnavox WM101 receiver. The superiority of the Mixed Model with respect to the Gauß-Markov-Model is proven by this special application of high precision deformation analysis in satellite geodetic networks based upon GPS carrier phases. Numéro de notice : 58687 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60419 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 58687-01 30.82 Livre Centre de documentation Géodésie Disponible Ermittlung von rezenten Oberflächenverformungen in der jungvulkanischen Zone NO-Islands aus geodätisch-geometrischen Beobachtungen / K. Wendt (1988)
Titre : Ermittlung von rezenten Oberflächenverformungen in der jungvulkanischen Zone NO-Islands aus geodätisch-geometrischen Beobachtungen Titre original : [Investigation des récentes déformations de surface dans la zone nord-ouest islandaise volcanique à partir d'observations géodésiques-géométriques] Type de document : Thèse/HDR Auteurs : K. Wendt, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1988 Collection : DGK - C Sous-collection : Dissertationen num. 338 Importance : 93 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9386-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géophysique interne
[Termes IGN] compensation
[Termes IGN] congruence
[Termes IGN] déformation de la croute terrestre
[Termes IGN] géodésie bidimensionnelle
[Termes IGN] Islande
[Termes IGN] modèle de déformation tectonique
[Termes IGN] volcanNuméro de notice : 28108 Affiliation des auteurs : non IGN Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63455 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28108-01 47.10 Livre Centre de documentation En réserve M-103 Disponible 28108-02 47.10 Livre Centre de documentation En réserve M-103 Disponible 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 Ocean tides and tectonic plate motions from LAGEOS / John M. Dow (1988)
Titre : Ocean tides and tectonic plate motions from LAGEOS Type de document : Thèse/HDR Auteurs : John M. Dow, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1988 Collection : DGK - C Sous-collection : Dissertationen num. 344 Importance : 180 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9392-8 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] analyse harmonique
[Termes IGN] application informatique
[Termes IGN] données TLS (télémétrie)
[Termes IGN] Lageos
[Termes IGN] marée océanique
[Termes IGN] marée terrestre
[Termes IGN] orbite circulaire
[Termes IGN] orbitographie
[Termes IGN] perturbation orbitale
[Termes IGN] rotation de la Terre
[Termes IGN] tectonique des plaquesIndex. décimale : 30.83 Applications océanographiques de géodésie spatiale Résumé : (Auteur) The objectives of this study were twofold:
to provide a detailed and systematic analysis of the influence of solid earth, ocean and atmospheric tides on the orbits of earth satellites; and
to apply the insight thus obtained in order to contribute to high precision determination of such orbits from ground tracking data, a process which requires simultaneous improvement of a number of geophysical models which are of interest in themselves.
A review of the relevant theoretical background concerning the mathematical description of the tide-generating potential and the response of the solid earth, oceans and atmosphere to this potential has been made, with a strong emphasis on several remarkable modern advances in this field, culminating in the work of Wahr in earth tides and that of Schwiderski in global ocean tide modelling.
The formulation of the tide-generating potential by Cartwright and Taylor (1972) has been used as the starting point for the development of a theory for the motion about an oblate earth of a satellite perturbed by the tidal response of the solid earth. Taking advantage of a well-known transformation procedure due to Kaula (1966), the perturbing potential could be written as a function of the keplerian elements of the satellite, and with this the Lagrange planetary equations provided the first order perturbations on the elements. Important second order perturbations arising from the coupling between the tidal perturbations and those secular perturbations due to the permanent oblateness of the earth were derived.
The principal and secondary frequencies of the resulting perturbations have been classified, showing clearly the dependence on the astronomical driving frequency and on the frequencies associated with the secular rates of the satellite angular elements. It has been shown that for certain critical combinations of these frequencies, which can arise for real satellite orbits of interest, the resulting perturbation frequency can be zero, so that the elements have secular variations. Unlike the secular variations coming from the oblateness perturbation, these apply also to the orbital inclination. The cumulative effect is however of such a magnitude, even over a typical satellite mission duration, that the linearity assumptions remain valid.
This approach differs from that of Kaula (1969), and of Lambeck (1980) and previous publications of Lambeck, Cazenave and Balmino (1974) and Cazenave, Daillet and Lambeck (1977), through the use of the Cartwright form of the tide-generating potential. This implicitly contains the lunar and solar motions in terms of their ecliptic, rather than equatorial elements, and thus gives a precisely correct representation of the relevant astronomical frequencies, and avoids any ambiguity in the application of frequency-dependent Love numbers. Musen and co-workers (1972, 1973, 1975) have also derived a theory in terms of ecliptic elements.
An analogous development has been carried out for ocean (and atmospheric) tidal perturbations on satellite motion. Here the starting point is a set of existing global ocean tide models obtained from integration of a generalised version of the Laplace tidal equations (Schwiderski). The external potential of a thin mass layer distributed over the surface of the earth is required, assuming a spherical harmonic representation of the mass layer and taking into account the additional potential due to loading of the underlying solid earth. Again, the Lagrange planetary equations were used to obtain the first order and most important second order perturbations on the elements. The approach adopted for the ocean tide developments is similar to that of Lambeck et al. (1974) and Lambeck (1980), but it is complete for all 6 elements and removes several errors in Lambeck's formulation.
The frequency spectrum for ocean tide perturbations is considerably more diverse than that of the solid earth perturbations due to the relative importance of harmonics of degree > 2. Pairs of frequencies appear, corresponding to positive and negative contributions of the astronomical frequency to the total perturbation frequency ('prograde' and 'retrograde' waves). It was shown that in general only the prograde terms can produce long-periodic perturbations, though there can be exceptions to this in cases of near-resonance.
In order to provide a consistent and complete set of spherical harmonic coefficients for a numerical study of the tidal perturbations, a spherical harmonic analysis of the 11 Schwiderski tidal models was performed, using a specially developed FORTRAN program ('KUGEL'). The 1 ° by 1 ° data for the amplitude multiplied by sine and cosine respectively of the phase were approximated up to degree and order 36, giving both prograde and retrograde coefficient sets. Since global synthesis of the spherical harmonics showed a surprising (rms and maximum) discrepancy with respect to the original data, a detailed investigation of the source of the inaccuracy was made. It was found that the agreement was everywhere good except around the coastlines. Significant zero degree coefficients reflect the non-conservation of water mass in the Schwiderski models. The extremely local coastal errors could only be removed by very high degree and order approximation, and are of no relevance for orbit perturbation analysis, except for very low orbits ( < 150 km).
The theory and numerical data thus obtained were implemented in a new FORTRAN program TIDES' aimed at generating a complete overview of the tidal perturbations on earth satellite orbits. The full second and third degree tide-generating potential was used in computing earth tide perturbations, while the ocean tide spectrum was represented by the 11 major tides for which models currently exist. Both prograde and retrograde terms were included in the latter. The S2 atmospheric tide was treated by analogy with the ocean tide. Emphasis was given to development of a concise graphical representation of the perturbation amplitudes, taking into account the fact that a given spectral line may arise from several tides and from the solid earth, ocean or atmospheric response, necessitating the combination of contributions having arbitrary phases.
A detailed application of this software was made to the orbits of Lageos, ERS-1, Starlette, GRM, GPS, EURECA, TOPEX and a geostationary satellite. The analysis of the Lageos orbit was used as the basis for the selection of tidal parameters to be determined in the second part of the study. It was shown that the sun-synchronism of ERS-1 is responsible for the existence of secular perturbations associated with the S2 tide, with rates in the angular elements of 1.9 m/d in the inclination and -5.8 m/d in the mean argument of latitude. Sun-synchronism causes degeneracy of the spectrum, including a concentration of lines around periods of 6 months and 1 y. Retrograde terms affect the orbit at the cm level. Third degree earth tides produce small perturbations on the eccentricity vector with monthly and ter-monthly periods. The frozen perigee produces a further degeneration of the spectrum of tidal perturbations on ERS-1. The Starlette, EURECA and
TOPEX orbital parameters produce a very rich tidal spectrum, due in part to significant values of both nodal and perigee rotation rates, with a concentration of lines at relatively high frequencies. The main long-period perturbations are from AT,, /*,, S2, Kt and A/2. The 5a atmospheric tide affects the TOPEX orbit by 2 m. GRM has resonances from the declination tides AT, and K2, due to the zero nodal rotation rate associated with a polar orbit about an oblate planet. The tides generate perturbation rates of several m/d on the node. The GPS satellites, in 12 hr orbits, exhibit a remarkable concentration of the tidal spectrum at very low frequencies (periods > 2300 d), and otherwise some semi-annual perturbations. A systematic analysis of this type has not appeared in the published literature.
The second part of this work involved the processing of a large data set of 3.3 y of laser ranging data from Lageos with a view to determining improved values for a sub-set of the ocean tide parameters affecting the motion of Lageos. An essential by-product in this was the precise determination of a large number of other parameters entering the mathematical models of the spacecraft motion and the laser ranging data: orbital elements, radiation pressure and empirical drag parameters, low degree and order gravity coefficients, the gravitational constant for the earth GM,, station positions and tectonic motions, second degree Love and Shida numbers defining tidal uplift and horizontal motion, and polar motion.
A previously developed orbit determination program ('BAHN') was modified to handle estimation of tidal and gravity parameters. An algorithm for combination of arbitrary sets of normal equations created by individual runs of the orbit determination software was implemented in a program called 'MULTIARC', which allows a partitioning of the normal equations according to a sub-division of the state variables to be estimated into arc-dependent and arc-independent classes.
Due to the very long overall length of the data span being processed, it was considered necessary to model the tectonic plate motions of the tracking stations. An option of estimating station velocities in the local topocentric coordinate system (east, north, up) was implemented in BAHN. As a first approximation, any existing tectonic plate model (e.g. that of Minster and Jordan) can be used. Software modules were also written to compare global station coordinate solutions (via a 7 parameter transformation) and to compare two series of earth rotation parameters (pole, UT1, LOD).
Three trial solutions were made by processing the 14 month MERIT data set (September 1983 to October 1984): first, in order to check the multi-arc approach, by generating a new station coordinate set from the combination of monthly arcs; second, as a test of the estimation of tidal parameters; and finally as a check on the effect of modelling plate motions. The first solution (TS1) showed an rms agreement over 20 stations of about 2 cm with a MERIT station coordinate solution previously obtained by the University of Texas. The second indicated a reasonable recovery of second degree parameters for the A/2, 52 and N2 tides, and a notable reduction in the rms laser residuals, suggesting that a significant signal had been removed from the data. The third test incorporated station velocities in a multi-arc solution for the network, using the Minster and Jordan AMO-2 model.
The final step was the derivation of a multi-year solution (TS4) for 60 tidal parameters by reduction of data from 40 arcs, each of 30 d duration, spanning the period September 1983 to December 1986, a total of nearly 170000 measurements. Initial estimates of the orbital elements and new stations appearing in the post-MERIT data had first to be derived. A set of 60 tidal parameters from 20 tides was selected on the basis of the Lageos perturbation analysis.
The solution is summarised as follows:
The along-track acceleration parameter showed a clear correlation with eclipse periods, in the sense of alternate minima and maxima during successive eclipse seasons, while maintaining a constant mean level of around -3 x 10~13 m/s2.
The pole coordinates were determined with 3 d resolution. In order to clearly separate earth rotation from tidal signals on the orbit node, UT1 was held fixed at the values obtained by interpolation in the 5 d VLBI solution ERP(NGS) 87 R 01. The two pole series show an rms discrepancy of 2.29 masec in xp and 2.16 masec in yf, with mean linear trends over 40 months of 1.65 x 10~3 and 0.37 x 10~3 masec/d. A small residual signal, mainly annual, remains, despite the fact that the small solar annual Sa tide was adjusted. Estimation of tidal parameters did however improve the agreement.
For 14 stations, reliable estimates of not only station positions but also secular (tectonic) velocities could be derived. Previous approaches to determining station motions from laser tracking have relied on deducing velocity a posteriori from successive determinations of position. The new technique employed here allowed the station velocities to be estimated directly from the whole data set. Agreement with a University of Texas solution SSC(CSR) 86 L 01 which used Minster and Jordan AM 1-2 plate motions was at the level of < 2 cm rms for epochs before 1986.0, but somewhat worse in longitude thereafter. (Time-varying 7-parameter transformation parameters were generated in the comparison.) The terrestrial reference frame was defined by holding fixed the longitude and longitude rate of one station (Matera), and the latitude and latitude rate of two stations (Matera and Arequipa). It was shown that the choice of stations here was not important, though they must be well separated. A network of baseline distances and rates was computed and the latter compared with those predicted by the Minster and Jordan (1978) model. In most cases the agreement was good (very small rates in intra-plate baselines, rates between North American and European stations ~ 15 mm/y) but there were a few notable exceptions. The Southern Californian station Monument Peak was shown to have a significant relative motion with respect to other laser stations on the North American plate: its motion is more consistent with a location on the neighbouring Pacific plate. The baseline Monument Peak - Quincy which lies along the San Andreas fault line was estimated to have a rate of -39 mm/y, in close agreement with the value of -35 mm/y derived by Clark et al. (1987) from VLBI measurements. No significant relative motion was detected along the line Quincy - Mazatlan (Mexico), which also roughly follows the San Andreas fault direction: both points are well outside the geologically unstable region assocated with the fault. A small contraction (~ 10 - 20 mm/y) was detected in baselines between North and South America (Arequipa) and between South America and Europe. Tectonic plate models (Chase 1978, Minster and Jordan 1978) do not constrain these motions very well, so that their predictions are more uncertain. The real (as opposed to formal) uncertainty of the laser baseline rate solutions is estimated to be about 10 mm/y for these lines. Although motions between Hawaii and the North American, Indian (Australia) and Eurasian plates are fairly consistent with the Minster-Jordan predictions, the south Pacific island station of Huahine exhibits significant additional westerly and northerly motions with respect to the prediction. Comparison with information from other techniques will be required in order to confirm whether or not this motion is real.
Since the modified GEM-L2 gravity model which was used in this work was computed without any consideration of ocean tides, 10 low degree and order gravity coefficients were included in the TS4 solution. The shifts were in all cases small, ranging from 1 part in 107 in C20 to 1%
in 5"4,. The C21 and S2l coefficients were estimated in order to take into account a small offset between the terrestrial reference pole and the mean axis of figure . A recent analysis of Wahr (1987) was applied to compute from these values a tentative estimate for the relative equatorial rotation rate of the core with respect to the mantle. Both components are of the order of 1(H times the rotation rate of the mantle.
A new value for the earth's gravitational constant GM, was determined: GM, = 398600.4406 ± 0.0002 (formal error). This value is consistent with the MERIT value of 398600.448 km3/s2, which was used as initial estimate, but while the latter is applicable to the solar system barycentric frame, the new value is recommended for computation of earth satellite orbits.
The Love number hj and Shida number 4 which provide a measure of vertical and horizontal tidal displacements at the earth's surface were estimated to be fij = 0.639, /2 = 0.113. The differences with respect to the values of Wahr (1981b) are equivalent to displacement amplitudes of ~ 1 cm, and can be partially explained by the neglect of ocean loading in computing station positions in the TS4 solution.
Improved coefficients were determined for the spherical harmonic development of 4 long-period tides (Sa, Ssa, Mm, Mf), 6 diurnal tides (Q{, Ot, /*,, A",, 165.575, ^,), and 6 semi-diurnal tides (N2, A/2, T» S2, K2, 275.575). In all cases 2nd degree coefficients were estimated; in addition, 3rd and in three cases 4th, degree coefficients were computed where the analysis of the perturbation amplitudes had indicated a significant contribution from these. The excellent observability apparent from the covariance propagation in the solution suggested that a considerably larger set of coefficients could be determined from the 1200 d data span. Comparison with the equivalent Schwiderski model (where available) indicated differences in phase which were in most cases less than 15° , but differences in amplitude of more than 30% in a few cases. Comparison with a very recently published solution from Goddard Space Flight Center, based on data from 17 satellites and including parameter estimates for 11 tides (Marsh et al. 1987), showed in general a high level of agreement. In particular, the 2nd degree amplitude and phase for A/2 are almost identical (3.27/3.26 cm, 322.1/320.9°) but significantly different from the Schwiderski values (2.96 cm, 310.6° ). This term is important in quantifying the energy dissipation in the earth-moon system. For the small Sa tide, for which no Schwiderski model exists, similar estimates were obtained (2.37/2.44 cm, 40.5/31.0°).
Simultaneous determination of ocean tide and tectonic plate parameters has not been reported in the literature. It was shown that estimation of each of these two classes of parameters is not excessively sensitive to the other, but non-negligible cross-coupling does occur.
By reprocessing a representative sample of the 30 d arcs (every fourth arc) with the new solution, it was found that the mean of the rms laser residuals in a monthly arc was reduced from 10.45 cm (TS1) to 7.06 cm (TS4), clearly demonstrating that a significant signal had been removed from the data by physically meaningful estimation of key model parameters.Numéro de notice : 58685 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60417 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 58685-01 30.83 Livre Centre de documentation Géodésie Disponible Plate tectonics at the joint of Pamirs and Tien-Shan in central Asia / R. Chen (1988)PermalinkProjet caraïbes [étude géophysique de la zone des caraïbes, participation française au programme de recherche du Jet Propulsion Laboratory] / Claude Boucher (1988)PermalinkStructure et cinématique d'une chaine de collision, les Alpes occidentales et centrales / G. Menard (1988)PermalinkThe dependence of gradients of modern movements of the earth crust on space scale in Finland / V. Pisarenko (1988)PermalinkGeostructural evolution of the southern alps : lineaments trends detected on Landsat images / Eugenio Zilioli in Remote sensing of environment, vol 23 n° 3 (01/12/1987)PermalinkMéthodologie d'utilisation de l'imagerie spatiale SPOT pour l'exploration pétrolière : exemple des permis du Bas-Languedoc / G. Gess (23/11/1987)PermalinkA comparison of Landsat MSS and TM imagery for interpretation of geologic structure / T.E. Townsend in Photogrammetric Engineering & Remote Sensing, PERS, vol 53 n° 9 (september 1987)PermalinkDeformation across the Asal-Ghoubbet rift, Djibouti, uplift and crustal extension 1979–1986 / Jean-Claude Ruegg in Geophysical research letters, vol 14 n° 7 (Juillet 1987)PermalinkStructural analysis of the main uraniferous chalcedony vein at G. El Missikat environs, central eastern desert, Egypt / F.S. Bakhit in International Journal of Remote Sensing IJRS, vol 8 n° 5 (May 1987)PermalinkDetection of subsurface geologic structures in the Tharthar area of central Iraq using Landsat images / N.M. Numan in ITC journal, vol 1987 n° 2 (April 1987)Permalink