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Estimation of gravity wave momentum flux with spectroscopic imaging / J. Tang in IEEE Transactions on geoscience and remote sensing, vol 43 n° 1 (January 2005)
[article]
Titre : Estimation of gravity wave momentum flux with spectroscopic imaging Type de document : Article/Communication Auteurs : J. Tang, Auteur ; F. Kamalabadi, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 103 - 109 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] analyse spectrale
[Termes IGN] effet atmosphérique
[Termes IGN] extraction
[Termes IGN] perturbation
[Termes IGN] rayonnement électromagnétique
[Termes IGN] spectroscopieRésumé : (Auteur) Atmospheric gravity waves play a significant role in the dynamics and thermal balance of the upper atmosphere. In this paper, we present a novel technique for automated and robust calculation of momentum flux of high-frequency quasi-monochromatic wave components from spectroscopic imaging and horizontal radar wind measurements. Our approach uses the two-dimensional (2-D) cross periodogram of two consecutive Doppler-shifted time-differenced (TD) images to identify wave components and estimate intrinsic wave parameters. Besides estimating the average perturbation of dominant waves in the whole field of view, this technique applies 2D short-space Fourier transform to the TD images to identify localized wave events. With the wave parameters acquired, the momentum flux carried by all vertically propagating wave components is calculated using an analytical model relating the measured intensity perturbation to the wave amplitude. This model is tested by comparing wave perturbation amplitudes inferred from spectroscopic images with those from sodium lidar temperature measurements. The proposed technique enables characterization of the variations in the direction and strength of gravity waves with high temporal resolution for each clear data-taking night. The nightly results provide statistical information for investigating seasonal and geographical variations in momentum flux of gravity waves. Numéro de notice : A2005-059 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.836268 En ligne : https://doi.org/10.1109/TGRS.2004.836268 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27197
in IEEE Transactions on geoscience and remote sensing > vol 43 n° 1 (January 2005) . - pp 103 - 109[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-05011 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Geodetic mobile solar spectrometer [GEMOSS] Type de document : Thèse/HDR Auteurs : Alexander Somieski, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2005 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 68 Projets : Gavdos / Importance : 205 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-11-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rayonnement électromagnétique
[Termes IGN] campagne d'expérimentation
[Termes IGN] positionnement par GPS
[Termes IGN] propagation troposphérique
[Termes IGN] spectromètre
[Termes IGN] spectroscopie
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] troposphèreIndex. décimale : 24.30 Rayonnement électromagnétique Résumé : (Auteur) The goal of this work was to develop a portable prototype of a solar spectrometer for the determination of tropospheric water vapor with a high precision as needed for geodetic applications. It was realized in the construction of the "GEodetic MObile Solar Spectrometer" (GEMOSS), which allows the simultaneous measurement of numerous single vibrational-rotational absorption lines in the wide wavelength range between 728 nm and 915 nm.
In order to achieve the wide wavelength range and the envisaged high measurement accuracy, a new optical layout of a high-resolution echelle spectrograph was applied. Furthermore, its instrumental characteristics were determined and considered in the analysis and simulation of the spectrum. Therefore, investigations were carried out concerning hardware requirements, appropriate spectral intervals, stabilization of the wavelength scale, determination of the apparatus function and stray light. In addition to the theoretical aspects of molecular absorption and emission in Earth's atmosphere, the meteorological model, ray tracing and the current state of molecular spectroscopie databases were examined. Furthermore, an algorithm for retrieving the integrated precipitable water vapor (PW) from GEMOSS spectra was developed. It is based on the "Differential Optical Absorption Spectroscopy" (DOAS) and includes the simulation of synthetic solar spectra. For the simulation the line strength parameters of H20 absorption lines were taken frorn the molecular spectroscopie database by the European Space Agency (ESA). Although the line strength parameters, which have a large impact on the accuracy of the simulated spectra and the retrieved PW, were improved during the last years, they still reveal significant errors. The wide spectral range of GEMOSS enables the accurate correction of those parameters using solar spectra measured at atmospheric conditions controlled by radiosonde soundings and a water vapor radiometer (WVR). For this purpose, a dedicated campaign was carried out at the meteorological station at Payerne (Switzerland) in May and June 2004. CEMOSS and a co-located WVR were deployed next to a Global Positioning Systern (GPS) receiver of the Automated GPS Network of Switzerland (AGNES). The acquired dataset was utilized to improve line strength parameters of 69 individual transitions of the H20 molecule between 732 mn and 906 nm.
In order to validate the performance of GEMOSS, a long-term series of PW was acquired at ETH Hönggerberg where a permanent GPS station (AGNES) is operated. With the utilization of up to 40 selected H20 absorption lines measured at the same time, an accuracy of the PW of 0.5 kg/m can be achieved. The comparison between GEMOSS and GPS revealed that GPS over-estimated the PW during the summer 2003 by about 2-3 kg/m . The same discrepancies were observed at Payerne in 2004 by comparing the GPS results with GEMOSS, WVR and radiosondes.
In the framework of the EU-project "GAVDOS", GEMOSS was operated under the track of the altimeter satellite Jason at Rethimnon (Crete, Greece) and at Fiskardo on the island of Kefalonia (Greece) in January and September in 2003. The highly precise PW measurements of GEMOSS were used to calibrate the on-board microwave radiometer of Jason (JMR). The integrated water vapor content which was simultaneously determined by GEMOSS and JMR agree at the 0.3-0.4 kg/m level. On the basis of these promising results GEMOSS can be considered as a novel portable tool for space-borne radiometer calibration and it will be deployed for further calibration of Jason in the future.Numéro de notice : 13265 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : 10.3929/ethz-a-004930678 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-68.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54946 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13265-01 24.30 Livre Centre de documentation Physique Disponible 13265-02 24.30 Livre Centre de documentation Physique Disponible Cartographie de la fraction argileuse du sol dans le rif marocain à l'aide du capteur ASTER et de l'analyse géostatique / M. Chikhaoui in Revue internationale de géomatique, vol 14 n° 3 - 4 (septembre 2004 – février 2005)
[article]
Titre : Cartographie de la fraction argileuse du sol dans le rif marocain à l'aide du capteur ASTER et de l'analyse géostatique Type de document : Article/Communication Auteurs : M. Chikhaoui, Auteur ; F. Bonn, Auteur ; A. Merzouk, Auteur Année de publication : 2004 Article en page(s) : pp 359 - 377 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse multibande
[Termes IGN] Argile
[Termes IGN] géostatistique
[Termes IGN] image Terra-ASTER
[Termes IGN] krigeage
[Termes IGN] Maroc
[Termes IGN] modèle linéaire
[Termes IGN] pédologie locale
[Termes IGN] spectroradiométrieRésumé : (Auteur) L'objectif de cette étude est d'établir un modèle linéaire pour estimer la fraction argileuse de l'horizon de surface des sols du bassin expérimental de Saboun, situé dans le Rif occidental du Maroc. Des images du capteur ASTER (Advanced Spacebome Thermal Emission and Reflection Radiometer) et des données spectroradiométriques de terrain ASD ont été utilisées afin de déterminer l'indice spectral qui permet la meilleure estimation du taux d'argile. L'analyse géostatistique a permis d'analyser les données images et d'éditer une carte thématique d'argile par krigeage. L'indice spectral intégrant les bandes 5 et 6 permet une estimation intéressante de la fraction argileuse de l'horizon de surface avec R2 de l'ordre de 0,67pour les données images alors que l'utilisation des données spectroradiométriques a permis d'avoir un R2 = 0, 74. Les résultats obtenus montrent l'intérêt de l'utilisation des données du capteur ASTER pour l'étude des sols dans un bassin méditerranéen (nord du Maroc). Numéro de notice : A2004-587 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.3166/rig.14.359-377 En ligne : https://doi.org/10.3166/rig.14.359-377 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27103
in Revue internationale de géomatique > vol 14 n° 3 - 4 (septembre 2004 – février 2005) . - pp 359 - 377[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 047-04031 RAB Revue Centre de documentation En réserve L003 Disponible Remote sensing in transition / Rudi Goossens (2004)
Titre : Remote sensing in transition : Proceedings of the 23rd symposium of the European association of remote sensing laboratories, Ghent, Belgium, 2 - 5 June 2003 Type de document : Actes de congrès Auteurs : Rudi Goossens, Éditeur scientifique Editeur : Rotterdam [Pays-Bas] : Millpress Année de publication : 2004 Conférence : EARSeL 2003, 23rd symposium of the European association of remote sensing laboratories 20/06/2003 05/06/2003 Ghent Belgique Importance : 546 p. Format : 18 x 25 cm Accompagnement : 1 cédérom ISBN/ISSN/EAN : 978-90-5966-007-6 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] atmosphère terrestre
[Termes IGN] biomasse
[Termes IGN] image Aqua-MODIS
[Termes IGN] image Envisat
[Termes IGN] image Ikonos
[Termes IGN] image Quickbird
[Termes IGN] image Terra-ASTER
[Termes IGN] image Terra-MODIS
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] neige
[Termes IGN] océan
[Termes IGN] radar pénétrant GPR
[Termes IGN] risque naturel
[Termes IGN] spectroscopieIndex. décimale : 35.40 Applications de télédétection - généralités Résumé : (éditeur) The 23rd EARSel Symposium was held from 2-5 Junz 2003 at the University of Ghent, Belgium, on the theme "Remote Sensing in Transition". From the different contributions made during this symposium it becomes clear that, after a set of new sensors like Envisat, Ikonos, Quickbird, ASTER, MODIS ... became operational, now also the applications have reached the operational stage. The development of adapted methodologies to this new generation of sensors needs a couple of years before entering the application stage.
It is also clear that Very High Resolution data has entered definitively the remote sensing applications "forum", with the emphasis on studies dealing with resolutions adapted to new application areas, urban structures for example, something which was not possible in the past since the resolutions were not appropriate. Many contributions illustrate the use of sensors with a better and finer spectral resolution. Environmental protection, a new field of application was also the theme of several contributions.
It must be started, nevertheless, that for the moment radar images remain the inherent tool for certain applications and Landsat TM and ETM+ for optical remote sensing, remain the "work horses". The recent difficulties with the Landcast sensor, however, may change this part of the "remote sensing landscape". But other sensors with others and sometimes more possibilities are ready to take over. Wo=ith new strategies for Earth observation being formulated, one may conclude that the remote sensing community really is in transition.Note de contenu : - Keynote lectures
- Envisat/ocean and atmosphere
- Data analysis techniques
- Vegetation and biomass
- Ice and snow
- Very high resolution data
- 3D remote sensing
- Ground penetrating radar
- Hazards and risks
- Land use/environment
- Imaging spectroscopy
- Exploitating image data bases
- EducationalNuméro de notice : 17027 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79212 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17027-01 CG2004 Livre Centre de documentation Congrès Disponible Spectral enhancement of selected pixels in Thematic Mapper images of the Guanajuato district (Mexico) to identify hydrothermally altered rocks / M.A. Torres-Verra in International Journal of Remote Sensing IJRS, vol 24 n° 22 (November 2003)
[article]
Titre : Spectral enhancement of selected pixels in Thematic Mapper images of the Guanajuato district (Mexico) to identify hydrothermally altered rocks Type de document : Article/Communication Auteurs : M.A. Torres-Verra, Auteur ; R.M. Prol-Ledesma, Auteur Année de publication : 2003 Article en page(s) : pp 4357 - 4373 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] altération géologique
[Termes IGN] faille géologique
[Termes IGN] géologie structurale
[Termes IGN] image Landsat-TM
[Termes IGN] Mexico (Mexique)
[Termes IGN] réponse spectrale
[Termes IGN] ressources minérales
[Termes IGN] roche
[Termes IGN] spectrométrieRésumé : (Auteur) The use of satellite Thematic Mapper (TM) images in mineral exploration has been very successful in pointing out the presence of key minerals. Here we present the results of the spectral enhancement of a TM image to identify oxides and hydroxylbearing minerals in the GuanaJuato district, using the two methods that yielded the best results in this area: band subtraction and principal component analysis on an image that included only. selected pixels and excluded areas that did not present any interest for mineral exploration. Different types of vegetation cover the study area: crops, bushes and forest. Previous application of conventional methods was used to identify areas where the spectral signatures suggested the presence of hydrothermal alteration. and further detailed spectral enhancement in selected pixels allowed the identification of alteration minerals in areas covered with different vegetation types that do not have a similar spectral response. A field check performed using a PIMA (Portable Infrared Mineral Analyser) spectrometer yielded a good correlation of the marked areas with the presence of hydrothermally altered rock. New areas with argillic alteration were discovered in the Sierra de Guanajuato and the San Anton areas. Also, the main structures were determined by applying several filters to the first principal component. The occurrence of hydrothermal alteration and the presence of main faults were used to define areas favourable for further detailed exploration programmes. Numéro de notice : A2003-309 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000075134 En ligne : https://doi.org/10.1080/0143116031000075134 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22605
in International Journal of Remote Sensing IJRS > vol 24 n° 22 (November 2003) . - pp 4357 - 4373[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 080-03221 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Performance of the MISR [multiangle imaging spectrodiometer] instrument during its first 20 months in Earth orbit / David J. Diner in IEEE Transactions on geoscience and remote sensing, vol 40 n° 7 (July 2002)PermalinkThe Multi-angle Imaging SpectroRadiometer science data system, its products, tools, and performance / G.W. Bothwell in IEEE Transactions on geoscience and remote sensing, vol 40 n° 7 (July 2002)PermalinkBidirectional NDVI and atmospherically resistant BRDF inversion for vegetation canopy / F. Gao in IEEE Transactions on geoscience and remote sensing, vol 40 n° 6 (June 2002)PermalinkEtude des relations spécifiques entre végétation et roches du massif de Ronda par télédétection hyperspectrale AVIRIS (1991) et HYMAP (2000) / Guillaume Hallereau (2001)PermalinkPermalinkLa thermographie infrarouge / G. Gaussorgues (1999)PermalinkEtudes des mélanges spectraux visible et infrarouge pour la cartographie pétrologique sur images Aviris / N. Goulli (1998)PermalinkDétection et estimation des signaux / D. Declercq (1996)PermalinkPermalinkCours de physique générale à l'usage de l'enseignement supérieur scientifique et technique / Georges Bruhat (1992)Permalink