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Atmospheric modeling in GPS data analysis for high accuracy positioning / Olivier Bock in Physics and chemistry of the Earth, Part A: Solid Earth and Geodesy, vol 26 n° 6-8 (2001)
[article]
Titre : Atmospheric modeling in GPS data analysis for high accuracy positioning Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Erik Doerflinger, Auteur Année de publication : 2001 Article en page(s) : pp 373 - 383 Note générale : biblographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données GPS
[Termes IGN] modèle atmosphérique
[Termes IGN] retard troposphérique zénithalRésumé : (auteur) In this paper we review the atmospheric modeling methods used in GPS data analysis. Due to the strong spatial inhomogeneity and temporal variability of atmospheric constituents, especially water vapor, accurate modeling of path delay in GPS signals is necessary for high-accuracy positioning (e.g., tectonics and sea-level change) and meteorological applications (climatology and weather forecasting). State-of-the-art path delay modeling consists primarily in parameter estimation. In this strategy, zenith path delays are estimated during the GPS data reduction. External correction is another common strategy, in which the wet path delay is measured by a remote sensing instrument (usually a microwave radiometer). However, the latter is not as generalized, and is rather used for specific field campaigns or local long term observations. Both strategies have led to quite similar coordinate accuracies (using daily GPS observations), at the level of 1–2 mm in the horizontal component and 5–10 mm in the vertical component. The external correction strategy is capable of achieving even higher accuracy under specific conditions. Recent models, including gradients in the parameter estimation strategy have only led to marginal improvement. A major limitation of both strategies seems to be the use of mapping functions for the hydrostatic path delay correction. With the parameter estimation strategy, this limitation applies also to wet path delay correction. The use of numerical weather prediction and analysis models, and/or spaceborne sounding instruments, is suggested for replacing mapping functions and possibly for performing directly the hydrostatic correction. New instruments, such as Raman lidars, might also be used for a more accurate external wet path delay correction in the presence of strong atmospheric inhomogeneity. Further work is still needed for achieving measurements of absolute water vapor distribution in the atmosphere for this purpose. Numéro de notice : A2001-181 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1016/S1464-1895(01)00069-2 Date de publication en ligne : 27/06/2001 En ligne : https://doi.org/10.1016/S1464-1895(01)00069-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102953
in Physics and chemistry of the Earth, Part A: Solid Earth and Geodesy > vol 26 n° 6-8 (2001) . - pp 373 - 383[article]Airborne GPS photogrammetry comes of age (Part One) / Peter Kuntu-Mensah in Surveying and land information systems, vol 61 n° 2 (01/06/2001)
[article]
Titre : Airborne GPS photogrammetry comes of age (Part One) Type de document : Article/Communication Auteurs : Peter Kuntu-Mensah, Auteur Année de publication : 2001 Article en page(s) : pp 93 - 102 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] aérotriangulation
[Termes IGN] données GPS
[Termes IGN] géoréférencement direct
[Termes IGN] photogrammétrie
[Termes IGN] point d'appuiRésumé : (auteur) The use of the global positioning system (GPS) to determine relative positional data for ground control points in a photogrammetric block adjustment is widely accepted and practiced. On the other hand, using GPS to determine camera exposure positions (airborne GPS, also known as ABGPS) drastically reduces, and possibly eliminates, the number of horizontal and vertical control points needed in aerial triangulation. Given that control point determination is a major time and cost component of any photogrammetric project, it would appear that commercial companies would be quick to implement GPS-derived exposure stations. Furthermore, control points are often on or near roads, making their location by ground-based survey techniques dangerous. In practice, the number of companies using ABGPS is extremely small, perhaps because of the natural uneasiness with the new technology. This paper reports the results of an empirical evaluation of the application of GPS-derived exposure stations for aerial triangulation. The results of this research show that airborne GPS is, indeed, practical and quite feasible with minimum or no ground control. The high accuracy level of current GPS technology meets the accuracy requirements of photogrammetric applications. The results of this research may help resolve any ambivalence about the use of airborne GPS and foster its application in everyday photogrammetric operations. Numéro de notice : A2001-222 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82337
in Surveying and land information systems > vol 61 n° 2 (01/06/2001) . - pp 93 - 102[article]Voir aussiExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 121-01021 SL Revue Centre de documentation Revues en salle Disponible Spatial and temporal distribution of atmospheric water vapor using space geodetic techniques / Lars Peter Kruse (2001)
Titre : Spatial and temporal distribution of atmospheric water vapor using space geodetic techniques Type de document : Thèse/HDR Auteurs : Lars Peter Kruse, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2001 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 61 Importance : 128 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-03-1 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] atmosphère terrestre
[Termes IGN] distribution spatiale
[Termes IGN] données GPS
[Termes IGN] modèle atmosphérique
[Termes IGN] temps réel
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] tomographie
[Termes IGN] troposphère
[Termes IGN] vapeur d'eau
[Termes IGN] water vapour radiometerIndex. décimale : 30.84 Applications de géodésie spatiale à l'atmosphère Résumé : (Auteur) This work investigates methodological aspects of the Global Positioning System (GPS) to validate its potential as a remote sensing tool for monitoring atmospheric water vapor. GPS estimates of integral precipital water vapor (IPWV) are compared with simultaneous measurements of collocated Water Vapor Radiometers (WVR), as well as atmospheric refraction models for validation of GPS for meteorological applications.
Based on a one year data set of continuous GPS estimates and WVR observations at ETH Zurich a standard deviation of 1.54 mm and an offset of 0.54 mm IPWV is found between the two techniques. The analysis of several dedicated observation campaigns carried out at different sites in Europe and on Hawaii revealed offsets between GPS estimates and WVR observations.
The instrumental methods are also compared with a numerical model of the troposphere using ground meteorological observations and radiosondes from the station Payerne of the Swiss meteorological network (ANETZ). The modeling results, obtained with a software package performing four-dimensional interpolations by collocation yield a standard deviation of 2.88 mm and a bias of 2.23 mm IPWV with respect to the GPS derived time series of IPWV. Furthermore a clear seasonal dependency of the GPS - WVR differences is recognized. Mainly the periods dominated by strong fluctuations of water vapor during summer and autumn months degrade the agreement between the two techniques.
Because of the high correlation between GPS estimated tropospheric parameters and the height component, potential error sources are investigated.
The accuracy of GPS-derived IPWV in near real-time for consideration in weather forecasting is degraded due to insufficient satellite orbit quality. Investigations on the impact of implementing predicted orbit information on GPS water vapor retrievals showed that the accuracy degrades by a factor of about 2 compared to results obtained with final precise orbits as released by the International GPS Service (IGS) about two weeks after the observations.
Finally the potential of GPS for resolving three-dimensional distributions of tropospheric water vapor by means of the tomographic technique is investigated and applied within this work. For this purpose a software package called AWATOS (Atmospheric WAter vapor TOmography Software) was developed. In order to validate the tomographic approach a dedicated field experiment was carried out on the Big Island of Hawaii, USA. Tomographic results based on the extremely dense Continuous GPS (CGPS) network in the Mt. Kilauea and Mauna Loa volcano area are presented. They are compared to other independent techniques, such as radiosondes, Water Vapor Radiometers, and a high resolution solar spectrometer.Numéro de notice : 13061 Affiliation des auteurs : non IGN Autre URL associée : http://dx.doi.org/10.3929/ethz-a-003884306 Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.3929/ethz-a-003884306 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-61.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54862 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 13061-02 30.84 Livre Centre de documentation Géodésie Disponible 13061-01 30.84 Livre Centre de documentation Géodésie Disponible The use of global navigation satellite systems (GNSS) signals in numerical weather prediction (NWP) / Lidia Cucurull Molina (2001)
Titre : The use of global navigation satellite systems (GNSS) signals in numerical weather prediction (NWP) Type de document : Thèse/HDR Auteurs : Lidia Cucurull Molina, Auteur ; Antonio Rius, Directeur de thèse Editeur : Barcelone [Espagne] : Institut d'Estudis Espacials de Catalunya, IEEC-CSIC Année de publication : 2001 Importance : 151 p. Note générale : bibliographie
Thèses présentées à l'Université de Physique de Barcelone pour obtenir le grade de docteur.Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] prévision météorologique
[Termes IGN] retard troposphérique zénithalNote de contenu : 1. Motivation
2. Introduction to NWP models
2.1. Basics of meteorological models
2.2. Data assimilation techniques
3. A new observational data source: GPS system
3.1. Timedelay effects on GPS signal
3.2. Modeling of the neutral atmospheric delay
4. The use of GPS to validate NWP models: atmospheric delays
4.1. The HIRLAM model: December 1996
4.2. The MM5 model: September 1999
4.3. The MASS model: September 1998
5. Variational assimilation of GPS-derived observations: 1D-VAR
5.1. 1D-VAR assimiliation of zenith total delay and surface pressure
5.2. Evaluation of the assimilation of ZTD observations
5.3. Assimilation of simulated ZTD observations
5.4. Evaluation of the assimilation of ZTD and Ps observations
5.5. Assimilation of real ZTD and Ps observations
6. Variational assimilation of GPS-derived observations: 4D-VAR
6.1. 4D-VAR assimilation of simulated precipitable water into a mesoscale model
6.2. 4D-VAR assimilation of zenith total delay observations into a mesoscale model
7. ConclusionsNuméro de notice : 19787 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : Thèse de doctorat : Physique : Barcelone : 2001 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85091 Documents numériques
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The use of global navigation satellite systems (GNSS) signals in numerical weather prediction (NWP)Adobe Acrobat PDF New constraints on Antarctic plate motion and deformation from GPS data / Marie-Noëlle Bouin in Journal of geophysical research : Solid Earth, vol 105 n° B12 ([10/12/2000])
[article]
Titre : New constraints on Antarctic plate motion and deformation from GPS data Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin , Auteur ; Christophe Vigny, Auteur Année de publication : 2000 Article en page(s) : 17 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Antarctique
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GPS
[Termes IGN] séisme
[Termes IGN] station GPS
[Termes IGN] système de référence géodésique
[Termes IGN] tectonique des plaquesRésumé : (Auteur) Four years (1995~1998) of continuous Global Positioning System (GPS) data recorded by 11 permanent International GPS Service (IGS) stations in Antarctica and surrounding regions have been processed using an optimized method for regional geodetic networks. The 4year time series has allowed us to extract nonlinear variations and constant horizontal velocities for all the stations. In December 1997 we have set up a permanent GPS station at Dumont d'Urville in Terre Adélie The resulting data, along with those of the Scientific Committee on Antarctic Research (SCAR) campaigns (1995 and 1996) are included in our processing. A co-seismic displacement (1 to 2 cm) is detected in the horizontal components of this station. We relate this to the March 25, 1998, Mw=8.1 Balleny Islands earthquake for which a dislocation model yields prediction in the right direction. For the six Antarctic stations the horizontal rates are very consistent with the rigid plate rotation, all the residual velocities are negligible (less than 2 mm/yr), except at O'Higgins in the head of the peninsula (7 mm/yr toward the continent). The position of the rotation pole (62.0'N, 146.7°W) and its rate (0.264°/Ma) are significantly different from the NNRNuvel1A predictions for the Antarctic tectonic plate but are consistent with the Australian relative motion. The high horizontal residual in the peninsula area, where iceberg calving rates and ice shelf disintegration have recently increased, can be interpreted as the horizontal component of the elastic crustal response to the load variations. Numéro de notice : A2000-270 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2000JB900285 Date de publication en ligne : 10/12/2000 En ligne : https://doi.org/10.1029/2000JB900285 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34435
in Journal of geophysical research : Solid Earth > vol 105 n° B12 [10/12/2000] . - 17 p.[article]Transformation des réceptions GPS en coordonnées cartographiques (suite) : GPS et coordonnées en projection / Henri Marcel Dufour in XYZ, n° 83 (juin - août 2000)PermalinkCombinations of Earth orientation measurements / Richard S. Gross (2000)PermalinkDer Mittelmeerraum. Numerische Modellierung der Lithosphärendynamik im Vergleich mit Ergebnissen aus der Satellitengeodäsie / O. Heidbach (2000)PermalinkEinfluß von Auflasteffekten auf präzise GPS-Messungen / Rolf Dach (2000)PermalinkTransformation des réceptions GPS en coordonnées cartographiques / Henri Marcel Dufour in XYZ, n° 82 (décembre 2000 - février 2001)PermalinkUntersuchung von GPS-Beobachtungen für kleinräumige geodätische Netze / R. Hollmann (2000)PermalinkGPS, DORIS and SLR combined geocenter motion from reference frame time series analysis / Patrick Sillard (1999)PermalinkGPS et information géographique, actes de la journée du 23 mars 1999, Aix-en-Provence, France / Jean-Pierre Chrétien (1999)PermalinkPermalinkIntégration dans un SIG de données GPS submétriques attribuées / P. Beguin (1999)Permalink