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Terra MODIS on-orbit spatial characterization and performance / X. Xiong in IEEE Transactions on geoscience and remote sensing, vol 43 n° 2 (February 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 2 (February 2005) . - pp 355 - 365 Titre : Terra MODIS on-orbit spatial characterization and performance Type de document : Article/Communication Auteurs : X. Xiong, Auteur ; N. Che, Auteur Année de publication : 2005 Article en page(s) : pp 355 - 365 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] capteur multibande [Termes IGN] étalonnage radiométrique [Termes IGN] instrument embarqué [Termes IGN] méthode robuste [Termes IGN] Moderate Resolution Imaging Spectroradiometer [Termes IGN] orbite [Termes IGN] performance [Termes IGN] superposition d'images Résumé : (Auteur) The Moderate Resolution Imaging Spectroradiometer (MODIS) Proto-Flight Model, onboard the National Aeronautics and Space Administration's Earth Observing System Terra spacecraft, has been in operation for over four years. It has 36 spectral bands and a total of 490 detectors located on four focal plane assemblies (FPAs). MODIS makes observations at three spatial resolutions (nadir): 0.25 km, (bands 1-2), 0.5 km (bands 3-7), and 1 km (bands 8-36). The instrument's spatial characterization was measured prelaunch using an integration and alignment collimator. Parameters measured included the detectors' instantaneous field-of-view (IFOV), band-to-band registration (BBR), and line spread function in both the along-scan and along-track directions. On orbit, the spatial characterization is periodically measured using the onboard spectro-radiometric calibration assembly (SRCA). This paper describes the SRCA BBR algorithms, characterization methodologies, and on-orbit results. A Fourier approach used to calculate the along-track BBR is also described. This approach enhances the algorithm's robustness in comparison with the conventional centroid approach. On-orbit results show that the Terra MODIS focal planes shifted slightly during launch and initial on-orbit operation. Since then they have been very stable. The BBR is within 0.16 km (nadir IFOV) in the along-scan direction and 0.23 km (nadir IFOV) in the along-track direction among all bands. The small but noticeable periodic variation of the on-orbit BBR can be attributed to the annual cycling of instrument temperature due to sun-earth distance variation. The visible FPA position has the largest temperature dependence among all FPAs, 17 m/K along-scan and 0.6 m/K along-track. Numéro de notice : A2005-103 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.840643 En ligne : https://doi.org/10.1109/TGRS.2004.840643 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27241 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-05022	RAB	Revue	Centre de documentation	En réserve L003	Disponible
065-05021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Derivation of a threshold function for the advanced very high resolution radiometer 3, 75um channel and its application in automatic cloud discrimination over snow/ice surfaces / X. Xiong in International Journal of Remote Sensing IJRS, vol 25 n° 15 (August 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 15 (August 2004) . - pp 2995 - 3017 Titre : Derivation of a threshold function for the advanced very high resolution radiometer 3, 75um channel and its application in automatic cloud discrimination over snow/ice surfaces Type de document : Article/Communication Auteurs : X. Xiong, Auteur ; R. Storvold, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2995 - 3017 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Alaska (Etats-Unis) [Termes IGN] albedo [Termes IGN] analyse discriminante [Termes IGN] Arctique, océan [Termes IGN] glace [Termes IGN] image NOAA-AVHRR [Termes IGN] luminance lumineuse [Termes IGN] nébulosité [Termes IGN] neige [Termes IGN] nuage [Termes IGN] rayonnement infrarouge moyen [Termes IGN] seuillage d'image Résumé : (Auteur) The distinct contrast between the reflectance of solar radiation in Advanced Very High Resolution Radiometer (AVHRR) channel 3 (3.75 um) by clouds and by bright surfaces provides an effective means of cloud discrimination over snow/ice surfaces. A threshold function for the top- of- atmosphere (TOA) albedo in channel 3 (r3) is derived and used to develop an improved method for cloud discrimination over snow/ice surfaces that makes explicit use of TOA r3. Corrections for radiance anisotropy and temperature effects are required to derive accurate values of r3 from satellite measurements and to utilize the threshold function. It has been used to retrieve cloud cover fractions from National Oceanic and Atmospheric Administration (NOAA)-14 AVHRR data over the Arctic Ocean and over the North Slope of Alaska (NSA) Atmospheric Radiation Measurement (ARM) site in Barrow, Alaska. The retrieved cloud fractions are in good agreement with SHEBA (Surface HEat Budget of the Arctic Ocean) surface visual observations and with NSA cloud radar and lidar observations, respectively. This method can be utilized to improve cloud discrimination over snow/ice surfaces for any satellite sensor with a channel near 3.7 um. Numéro de notice : A2004-297 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160310001619553 En ligne : https://doi.org/10.1080/01431160310001619553 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26824 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04131	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt