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Auteur Saji Abraham |
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Faraday rotation correction for the SMAP radiometer / David M. Le Vine in IEEE Transactions on geoscience and remote sensing, vol 54 n° 4 (April 2016)
[article]
Titre : Faraday rotation correction for the SMAP radiometer Type de document : Article/Communication Auteurs : David M. Le Vine, Auteur ; Saji Abraham, Auteur ; Jinzheng Peng, Auteur Année de publication : 2016 Article en page(s) : pp 2070 - 2081 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] évaluation des données
[Termes IGN] humidité du sol
[Termes IGN] mission SMAP
[Termes IGN] radiomètre
[Termes IGN] rotation de Faraday
[Termes IGN] Soil Moisture Active Passive
[Termes IGN] surface de l'eau
[Termes IGN] surface du solRésumé : (Auteur) Faraday rotation is an important issue for remote sensing of parameters such as soil moisture and ocean salinity, which are best done at low microwave frequency (e.g., L-band). Modern instruments such as the radiometer on the Soil Moisture and Ocean Salinity (SMOS) satellite and the Aquarius radiometers include polarimetric radiometer channels specifically to implement a correction for Faraday rotation. This works well over ocean, but it is known that over inhomogeneous scenes, such as a land/water mixture, significant errors can occur. This is a particularly important issue for the newest L-band sensor in space, the radiometer on the Soil Moisture Active Passive (SMAP) satellite, where the goal is remote sensing over land (soil moisture) and where the conical scan induces rapid variation in Faraday rotation. Analysis is presented here of the issues associated with retrieving Faraday rotation using the SMAP geometry and antenna pattern. It is shown that, in addition to scenes with a mixture of land and water, scenes with significant vegetation canopy are also associated with large errors in the retrieved Faraday rotation. Examples from the SMAP radiometer support the analysis. Numéro de notice : A2016-839 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2495168 En ligne : https://doi.org/10.1109/TGRS.2015.2495168 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82883
in IEEE Transactions on geoscience and remote sensing > vol 54 n° 4 (April 2016) . - pp 2070 - 2081[article]Fish-eye calibration and epipolar rectification / Saji Abraham in ISPRS Journal of photogrammetry and remote sensing, vol 59 n° 5 (August - October 2005)
[article]
Titre : Fish-eye calibration and epipolar rectification Type de document : Article/Communication Auteurs : Saji Abraham, Auteur ; Wolfgang Förstner, Auteur Année de publication : 2005 Article en page(s) : pp 278 - 288 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] correction d'image
[Termes IGN] couple stéréoscopique
[Termes IGN] étalonnage géométrique
[Termes IGN] étalonnage radiométrique
[Termes IGN] géométrie épipolaire
[Termes IGN] modèle mathématique
[Termes IGN] projectionRésumé : (Auteur) The paper describes calibration and epipolar rectification for stereo with fish-eye optics. While stereo processing of classical cameras is state of the art for many applications, stereo with fish-eye cameras have been much less discussed in literature. This paper discusses the geometric calibration and the epipolar rectification as pre-requisite for stereo processing with fish-eyes. First, it surveys mathematical models to describe the projection. Then the paper presents a method of generating epipolar images which are suitable for stereo-processing with a field of view larger than 1 SO' in vertical and horizontal viewing directions. One example with 3D-point measuring from real fish-eye images demonstrates the feasibility of the calibration and rectification procedure. Copyright ISPRS Numéro de notice : A2005-352 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.03.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.03.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27488
in ISPRS Journal of photogrammetry and remote sensing > vol 59 n° 5 (August - October 2005) . - pp 278 - 288[article]Exemplaires(1)
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