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Assimilation of remote sensed data for improved latent and sensible heat flux prediction: a comparative synthetic study / R. Pipunic in Remote sensing of environment, vol 112 n° 4 (15/04/2008)
[article]
Titre : Assimilation of remote sensed data for improved latent and sensible heat flux prediction: a comparative synthetic study Type de document : Article/Communication Auteurs : R. Pipunic, Auteur ; J. Walker, Auteur ; A. Western, Auteur Année de publication : 2008 Article en page(s) : pp 1295 - 1305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse comparative
[Termes IGN] chaleur
[Termes IGN] filtre de Kalman
[Termes IGN] flux de rayonnement
[Termes IGN] humidité du sol
[Termes IGN] image Terra-MODIS
[Termes IGN] modèle numérique de surface
[Termes IGN] SMOSRésumé : (Auteur) Predicted latent and sensible heat fluxes from Land Surface Models (LSMs) are important lower boundary conditions for numerical weather prediction. While assimilation of remotely sensed surface soil moisture is a proven approach for improving root zone soil moisture, and presumably latent (LE) and sensible (H) heat flux predictions from LSMs, limitations in model physics and over-parameterisation mean that physically realistic soil moisture in LSMs will not necessarily achieve optimal heat flux predictions. Moreover, the potential for improved LE and H predictions from the assimilation of LE and H observations has received little attention by the scientific community, and is tested here with synthetic twin experiments. A one-dimensional single column LSM was used in 3-month long experiments, with observations of LE, H, surface soil moisture and skin temperature (from which LE and H are typically derived) sampled from truth model run outputs generated with realistic data inputs. Typical measurement errors were prescribed and observation data sets separately assimilated into a degraded model run using an Ensemble Kalman Filter (EnKF) algorithm, over temporal scales representative of available remotely sensed data. Root Mean Squared Error (RMSE) between assimilation and truth model outputs across the experiment period were examined to evaluate LE, H, and root zone soil moisture and temperature retrieval. Compared to surface soil moisture assimilation as will be available from SMOS (every 3 days), assimilation of LE and/or H using a best case MODIS scenario (twice daily) achieved overall better predictions for LE and comparable H predictions, while achieving poorer soil moisture predictions. Twice daily skin temperature assimilation achieved comparable heat flux predictions to LE and/or H assimilation. Fortnightly (Landsat) assimilations of LE, H and skin temperature performed worse than 3-day moisture assimilation. While the different spatial resolutions of these remote sensing data have been ignored, the potential for LE and H assimilation to improve model predicted LE and H is clearly demonstrated. Copyright Elsevier Numéro de notice : A2008-089 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2007.02.038 En ligne : https://doi.org/10.1016/j.rse.2007.02.038 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29084
in Remote sensing of environment > vol 112 n° 4 (15/04/2008) . - pp 1295 - 1305[article]The 26 December 2004 tsunami measured by satellite altimetry / J. Gower in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)
[article]
Titre : The 26 December 2004 tsunami measured by satellite altimetry Type de document : Article/Communication Auteurs : J. Gower, Auteur Année de publication : 2007 Article en page(s) : pp 2897 - 2913 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] altimétrie satellitaire par radar
[Termes IGN] Bengale, golfe du
[Termes IGN] données altimétriques
[Termes IGN] épicentre
[Termes IGN] image Envisat
[Termes IGN] Indien (océan)
[Termes IGN] Jason
[Termes IGN] océanographie spatiale
[Termes IGN] séisme
[Termes IGN] surface de la mer
[Termes IGN] TOPEX-Poseidon
[Termes IGN] tsunami
[Vedettes matières IGN] AltimétrieRésumé : (Auteur) The 26 December 2004 magnitude 9 earthquake off Sumatra provided the first examples of travelling tsunami waves in mid-ocean clearly detected by satellite altimetry. The earthquake was the largest since satellite altimetry started in the 1970s and gave peak-to-trough wave heights in mid-ocean of over a metre. The tsunami was detected by three of the four altimeters presently giving sea surface height information. Each detected the spreading front twice, as it moved south-westwards into the Indian Ocean and as it moved northwards into the Bay of Bengal. They also detected the disturbed region closer to the epicentre that expands with the slower velocities of higher-frequency waves. Although the plate rupture is estimated to extend over about 1300 km in a north/south direction, the satellite observations appear consistent with a smaller generation area towards the south of this rupture zone. Fronts observed in the Indian Ocean show a positive first crest. Those observed in the Bay of Bengal are of smaller amplitude and appear to show a first negative first crest (trough). The structure in the Indian Ocean front observed by Jason-1 suggests the possible presence of a shorter-wavelength negative component superimposed on the positive crest. Copyright Taylor & Francis Numéro de notice : A2007-335 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160601094484 En ligne : https://doi.org/10.1080/01431160601094484 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28698
in International Journal of Remote Sensing IJRS > vol 28 n° 13-14 (July 2007) . - pp 2897 - 2913[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-07081 RAB Revue Centre de documentation En réserve L003 Disponible Les sentinelles de demain / Françoise de Blomac in SIG la lettre, n° 88 (juin 2007)
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Titre : Les sentinelles de demain Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2007 Article en page(s) : pp 6 - 8 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Satellites artificiels
[Termes IGN] Agence spatiale européenne
[Termes IGN] constellation Sentinel
[Termes IGN] Copernicus (programme européen)
[Termes IGN] protection de l'environnement
[Termes IGN] satellite d'observation de la mer
[Termes IGN] satellite d'observation de la TerreRésumé : (Auteur) Grâce à GMES, des services innovants pour la sécurité et la protection de l'environnement sont en cours de développement. Mais dans le futur ? Comment assurer la pérennité et l'évolution de ces services ? Pour garantir que de bonnes données satellitaires seront toujours disponibles, même après Spot ou Envisat, l'Agence Spatiale Européenne (l'ESA) est chargée de concevoir un programme de satellites baptisés Sentinelles ("Sentinel" en anglais). Les premiers lancements sont prévus pour 2011. Copyright SIG La Lettre Numéro de notice : A2007-253 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28616
in SIG la lettre > n° 88 (juin 2007) . - pp 6 - 8[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 286-07061 RAB Revue Centre de documentation En réserve L003 Disponible Estimating the noise in space-geodetic positioning: the case of DORIS / Karine Le Bail in Journal of geodesy, vol 80 n° 8-11 (November 2006)
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Titre : Estimating the noise in space-geodetic positioning: the case of DORIS Type de document : Article/Communication Auteurs : Karine Le Bail , Auteur Année de publication : 2006 Article en page(s) : pp 541 - 565 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] bruit blanc
[Termes IGN] bruit rose
[Termes IGN] données DORIS
[Termes IGN] ENVISAT
[Termes IGN] filtrage du bruit
[Termes IGN] méthode du maximum de vraisemblance (estimation)
[Termes IGN] positionnement par DORIS
[Termes IGN] série temporelle
[Termes IGN] SPOT
[Termes IGN] station DORIS
[Termes IGN] TOPEX-Poseidon
[Termes IGN] traitement du signalRésumé : (Auteur) The noise spectrum in DORIS ground-station motion is investigated by means of the Allan variance method applied to the decomposition of the 3D signal into its principal components in the time domain. Sets of weekly position time-series from 1994 to 2005 derived by three IDS Analysis Centres (IGN-JPL, INASAN, and LEGOS-CLS) for 119 stations at 69 sites are considered. The observing satellites are SPOT-2, SPOT-3, SPOT-4, and SPOT-5, TOPEX/Poseidon, and ENVISAT. Annual and semi-annual perturbations, as well as the 117.3-day term associated with the TOPEX/Poseidon orbit, are found at most stations. Their amplitudes reach up to 19.3, 23.7, and 13.3 mm, respectively, for the three analysis centres (ACs). When corrected for these components and a linear drift, the time-series dominantly show white noise (WN) at the 10-45mm level the noise level is the highest in the East direction, probably in connection with the high orbit inclinations. The noise level is minimum for the high latitude stations, mostly and intensively observed by the SPOT satellites, and the determination of the noise type is unclear; longer observation spans would be needed to decide between interannual variations and flicker noise. The improvement in positioning due to the DORIS constellation extension from three to five satellites in 2002, and the network rejuvenation program initiated in 2000, results in a decrease of the noise level by a factor of 1.7 in a WN context, both before and after the changes. One example of the benefit of studying the signal in the time eigenspace domain is the detection of anomalously large WN in the East direction for station HBKB (Hartebeesthoek, Africa) that masks the above-mentioned improvement. Studying the projection on the local frame of the second and third time-eigenspace components, a noise excess is detected in the North direction for some of the ACs. Station stability derived from our time-series analysis confirms, in general, the expected performance based on the careful technical review of the station components (antenna, pillar, etc.). The respective merits of our noise qualification method, based on direct time-series analysis in the time-eigenspace domain without any a priori statistical model, in comparison with other methods, such as the selection of a mixed-noise model by maximum likelihood estimation, are discussed. Copyright Springer Numéro de notice : A2006-535 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0088-y En ligne : https://doi.org/10.1007/s00190-006-0088-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28258
in Journal of geodesy > vol 80 n° 8-11 (November 2006) . - pp 541 - 565[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-06101 RAB Revue Centre de documentation En réserve L003 Disponible 266-06102 RAB Revue Centre de documentation Revues en salle Disponible Determination of evolution of the altimetric mean level of western mediterranean from the Jason-1 Data: comparison with analysis of the tidal gauge measurements / M. Haddad in Bulletin des sciences géographiques, n° 18 (octobre 2006)
[article]
Titre : Determination of evolution of the altimetric mean level of western mediterranean from the Jason-1 Data: comparison with analysis of the tidal gauge measurements Type de document : Article/Communication Auteurs : M. Haddad, Auteur ; Hassen Abdellaoui, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 13 - 17 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Océanographie
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] analyse comparative
[Termes IGN] analyse harmonique
[Termes IGN] données altimétriques
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] geoïde marin
[Termes IGN] Jason
[Termes IGN] marégraphe
[Termes IGN] Méditerranée, mer
[Termes IGN] niveau moyen des mers
[Termes IGN] PoseidonRésumé : (Auteur) The sea surface topography, which is directly linked to the shape of the geoid and to oceanic effects, is only measurable thanks to the spatial and temporal resolution of satellite altimetry. The contributions of satellite altimetry study in the Mediterranean have been considerable. The first maps of the marine geoid, with relative accuracy of one to two decimetres depending on the methods used, have contributed greatly to the understanding of geophysical phenomena. Subsequently, thanks to reductions in orbital errors, improvements in gravitational models, and to the development of pseudo-geometrical orbit computations, the accuracy of determination of the absolute mean sea level has improved from several meters to a few centimetres. The study presented here aims to determine seasonal variations in mean sea level in the Western Mediterranean basin by analysis of Jason-1 data corrected of different perturbations like the geophysical phenomena, the ocean wave influence, the inverse barometer effect, and the orbit error. The analysis of altimetric data Jason-1 allowed us to observe a strong amplitude of variations of the average level in the Western Mediterranean basin, of the order of 20 cm, with a characteristic period of one year. The comparison of the variation of the average height sea level at the harbour of Algiers obtained from analysis of altimetric data Jason-1 and from the harmonic analysis of tidal gauge measurements, showed almost identical results. Numéro de notice : A2006-519 Affiliation des auteurs : non IGN Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28242
in Bulletin des sciences géographiques > n° 18 (octobre 2006) . - pp 13 - 17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 253-06021 RAB Revue Centre de documentation En réserve L003 Disponible L'étude et l'observation de la terre en France en 2005 / G. Begni in Revue Française de Photogrammétrie et de Télédétection, n° 179 (Décembre 2005)PermalinkDefining a DORIS core network for Jason-1 precise orbit determination based on ITRF2000 : methods and realization / Pascal Willis in Journal of geodesy, vol 79 n° 6-7 (September - October 2005)PermalinkRethinking satellite-based solar irradiance modelling the SOLIS clear-sky module / R.W. Mueller in Remote sensing of environment, vol 91 n° 2 (30/05/2004)PermalinkStopping the slaughter / M.J. Wagner in GEO:connexion, vol 3 n° 2 (february 2004)PermalinkOne-centimeter orbit determination for Jason-1: New GPS-based strategies / Bruce J. Haines in Marine geodesy, vol 27 n°1-2 (January - June 2004)PermalinkLa Terre vue de l'espace / Anny Cazenave (2004)PermalinkThe role of Laser ranging for calibrating Jason-1: The Corsica tracking campaign / Pierre Exertier in Marine geodesy, vol 27 n°1-2 (January - June 2004)PermalinkTopex-Jason combined GPS-DORIS orbit determination in the TanDEM phase / Pascal Willis in Advances in space research, vol 31 n° 8 (14/03/2003)PermalinkEarth observation from space: UK style / Gordon Petrie in Geoinformatics, vol 5 n° 7 (01/11/2002)PermalinkEnvisat safety launched: Europe's green machine is now in orbit! / Gordon Petrie in Geoinformatics, vol 5 n° 3 (01/04/2002)PermalinkEnvisat - Europe's newest scientific satellite / Gordon Petrie in Geoinformatics, vol 5 n° 2 (01/03/2002)PermalinkJason-1, le satellite mesureur des océans / Pascal Bonnefond in XYZ, n° 90 (mars - mai 2002)PermalinkL'océanographie opérationnelle : une construction internationale / Y. Menard in Atmosphériques, n° 12 (01/10/2001)PermalinkPermalinkPermalinkRapport d'activité 1998 et propositions de recherche spatiale 2000, 3. Propositions de recherche spatiale 2000 : opérations engagées / Georges Balmino (1999)PermalinkTopex-Poséïdon, mesureur des océans / J.P. Penot in BT, Bibliothèque de Travail, n° 1103 (01/12/1998)PermalinkTerrestrial reference frame differences for Topex Poseidon / Laurent Morel (15/10/1998)PermalinkRapport n° 1, Définition et étapes du travail de thèse, sujet de thèse "Références géodésiques pour les futures missions altimétriques / Laurent Morel (1998)PermalinkRapport de thèse 2 / Laurent Morel (1998)Permalink