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The emissivity of foam-covered water surface at L-band: theoretical modelling and experimental results from the frog 2003 field experiment / A. Camps in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 5 (May 2005) . - pp 925 - 937 Titre : The emissivity of foam-covered water surface at L-band: theoretical modelling and experimental results from the frog 2003 field experiment Type de document : Article/Communication Auteurs : A. Camps, Auteur ; M. Vall-Llossera, Auteur ; R. Villarino, Auteur Année de publication : 2005 Article en page(s) : pp 925 - 937 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] angle d'incidence [Termes IGN] bande L [Termes IGN] emissivité [Termes IGN] houle [Termes IGN] polarisation [Termes IGN] salinité [Termes IGN] spectre électromagnétique [Termes IGN] surface de la mer [Termes IGN] télédétection en hyperfréquence Résumé : (Auteur) Sea surface salinity can he measured by microwave radiometry at L-band (1400-1427 MHz). This frequency is a compromise between sensitivity to the salinity, small atmospheric perturbation, and reasonable pixel resolution. The description of the ocean emission depends on two main factors: 1) the sea water permittivity, which is a function of salinity, temperature, and frequency, and 2) the sea surface state, which depends on the wind-induced wave spectrum, swell, and rain-induced roughness spectrum, and by the foam coverage and its emissivity. This study presents a simplified two-layer emission model for foam-covered water and the results of a controlled experiment to measure the foam emissivity as a function of salinity, foam thickness, incidence angle, and polarization. Experimental results are presented, and then compared to the two-layer foam emission model with the measured foam parameters used as input model parameters. At 37 psu salt water the foam-induced emissivity increase is ~0.007 per millimeter of foam thickness (extrapolated to nadir), increasing with increasing incidence angles at vertical polarization, and decreasing with increasing incidence angles at horizontal polarization. Numéro de notice : A2005-213 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.839651 En ligne : https://doi.org/10.1109/TGRS.2004.839651 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27350 [article]

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Microwave land emissivity calculations using AMSU measurements / Fatima Karbou in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 5 (May 2005) . - pp 948 - 959 Titre : Microwave land emissivity calculations using AMSU measurements Type de document : Article/Communication Auteurs : Fatima Karbou, Auteur ; C. Prigent, Auteur Année de publication : 2005 Article en page(s) : pp 948 - 959 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] Advanced Microwave Sounding Unit [Termes IGN] emissivité [Termes IGN] image DMSP-SSM/I [Termes IGN] image NOAA-AMSU [Termes IGN] surface du sol [Termes IGN] télédétection en hyperfréquence Résumé : (Auteur) Atmospheric parameter retrievals over land from Advanced Microwave Sounding Unit (AMSU) measurements, such as atmospheric temperature and moisture profiles, could be possible using a reliable estimate of the land emissivity. The land surface emissivities have been calculated using six months of data, for 30 beam positions (observation zenith angles from 58° to +58°) and the 23.8-, 31.4-, 50.3-, 89-, and 150-GHz channels. The emissivity calculation covers a large area including Africa, Eurasia, and Eastern South America. The day-to-day variability of the emissivity is less than 2% in these channels. The angular and spectral dependence of the emissivity is studied. The obtained AMSU emissivities are in good agreement with the previously derived SSMI ones. The scan asymmetry problem has been evidenced for AMSU-A channels. And possible extrapolation of the emissivity from window channels to sounding ones has been successfully tested. Numéro de notice : A2005-214 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.837503 En ligne : https://doi.org/10.1109/TGRS.2004.837503 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27351 [article]

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NOAA operational hydrological products derived from the Advanced Microwave Sounding Unit / R.R. Ferraro in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 5 (May 2005) . - pp 1036 - 1049 Titre : NOAA operational hydrological products derived from the Advanced Microwave Sounding Unit Type de document : Article/Communication Auteurs : R.R. Ferraro, Auteur ; F. Weng, Auteur ; N.C. Grody, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 1036 - 1049 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] données hydrographiques [Termes IGN] données météorologiques [Termes IGN] hyperfréquence [Termes IGN] image Aqua-AMSR [Termes IGN] image NOAA-AMSU [Termes IGN] surveillance météorologique Résumé : (Auteur) With the launch of the NOAA-15 satellite in May 1998, a new generation of passive microwave sounders was initiated. The Advanced Microwave Sounding Unit (AMSU), with 20 channels spanning the frequency range from 23-183 GHz, offers enhanced temperature and moisture sounding capability well beyond its predecessor, the Microwave Sounding Unit (MSU). In addition, by utilizing a number of window channels on the AMSU, the National Oceanic and Atmospheric Administration (NOAA) expanded the capability of the AMSU beyond the original purpose and developed a new suite of products that tare generated through the Microwave Surface and Precipitation Products System (MSPPS). This includes precipitation rate, total precipitable water, land surface emissivity, and snow cover. Details on the current status of the retrieval algorithms (as of September 2004) are presented. These products are complimentary to similar products obtained from the Defense Meteorological Satellite Program Special Sensor Microwave/Imager (SSMI) and the Earth Observing Aqua Advanced Microwave Scanning Radiometer (AMSR-E). Due to the close orbital equatorial crossing time between NOAA-16 and the Aqua satellites, comparisons between several of the MSPPS products are made with AMSR-E. Finally, several application examples are presented that demonstrate their importance to weather forecasting and analysis, and climate monitoring. Numéro de notice : A2005-215 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.843249 En ligne : https://doi.org/10.1109/TGRS.2004.843249 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27352 [article]

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MIRAS end-to-end calibration: application to SMOS L1 processor / I. Corbella in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 5 (May 2005) . - pp 1126 - 1134 Titre : MIRAS end-to-end calibration: application to SMOS L1 processor Type de document : Article/Communication Auteurs : I. Corbella, Auteur ; F. Torres, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 1126 - 1134 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] bruit (théorie du signal) [Termes IGN] erreur [Termes IGN] étalonnage radiométrique [Termes IGN] Microwave Imaging Radiometer with Aperture Synthesis [Termes IGN] radiomètre à hyperfréquence [Termes IGN] reconstruction d'image [Termes IGN] Soil Moisture and Ocean Salinity Mission [Termes IGN] température de luminance Résumé : (Auteur) End-to-end calibration of the Microwave Imaging Radiometer by Aperture Synthesis (MIRAS) radiometer refers to processing the measured raw data up to dual-polarization brightness temperature maps over the earth's surface, which is the level 1 product of the Soil Moisture and Ocean Salinity (SMOS) mission. The process starts with a self-correction of comparators offset and quadrature error and is followed by the calibration procedure itself. This one is based on periodically injecting correlated and uncorrelated noise to all receivers in order to measure their relevant parameters, which are then used to correct the raw data. This can deal with most of the errors associated with the receivers but does not correct for antenna errors, which must be included in the image reconstruction algorithm. Relative S-parameters of the noise injection network and of the input switch are needed as additional data, whereas the whole process is independent of the exact value of the noise source power and of the distribution network physical temperature. On the other hand, the approach relies on having at least one very well-calibrated reference receiver, which is implemented as a noise injection radiometer. The result is the calibrated visibility function, which is inverted by the image reconstruction algorithm to get the brightness temperature as a function of the director cosines at the antenna reference plane. The final step is a coordinate rotation to obtain the horizontal and vertical brightness temperature maps over the earth. The procedures presented are validated using a complete SMOS simulator previously developed by the authors. Numéro de notice : A2005-216 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.840458 En ligne : https://doi.org/10.1109/TGRS.2004.840458 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27353 [article]

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MIRAS reference radiometer: a fully polarimetric noise injection radiometer / A. Colliander in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 5 (May 2005) . - pp 1135 - 1143 Titre : MIRAS reference radiometer: a fully polarimetric noise injection radiometer Type de document : Article/Communication Auteurs : A. Colliander, Auteur ; S. Tauriainen, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 1135 - 1143 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] bruit (théorie du signal) [Termes IGN] corrélation automatique de points homologues [Termes IGN] étalonnage d'instrument [Termes IGN] formule de Stokes [Termes IGN] Microwave Imaging Radiometer with Aperture Synthesis [Termes IGN] polarisation Résumé : (Auteur) A prototype reference radiometer for the Microwave lmaging Radiometer Using Aperture Synthesis (MIRAS) instrument of the Soil Moisture and Ocean Salinity satellite has been developed. The reference radiometer is an L-band fully polarimetric noise injection radiometer (NIR). The main purposes of the NIR are : 1) to provide precise measurement of the average fully polarimetric brightness temperature scene for absolute calibration of the MIRAS image map and 2) to measure the noise temperature level of the noise distribution network of the MIRAS for individual receiver calibration. The performance of the NIR is a decisive factor of the MIRAS performance. In this paper, we present the operation principles and calibration procedures of the NIR, a measurement technique called blind correlation making measurements of full Stokes vector possible with the noise injection method, and finally experimental results verifying certain aspects of the design. Numéro de notice : A2005-217 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.840667 En ligne : https://doi.org/10.1109/TGRS.2004.840667 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27354 [article]

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