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Four years of Landsat-7 on orbit geometric calibration and performance / D. Scott Lee in IEEE Transactions on geoscience and remote sensing, vol 42 n° 12 (December 2004)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 42 n° 12 (December 2004) . - pp 2786 - 2795 Titre : Four years of Landsat-7 on orbit geometric calibration and performance Type de document : Article/Communication Auteurs : D. Scott Lee, Auteur ; J.C. Storey, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2786 - 2795 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] élément d'orientation interne [Termes IGN] étalonnage géométrique [Termes IGN] étalonnage radiométrique [Termes IGN] Landsat [Termes IGN] précision géométrique (imagerie) Résumé : (Auteur) Unlike its predecessors, Landsat-7 has undergone regular geometric and radiometric performance monitoring and calibration since launch in April 1999. This ongoing activity, which includes issuing quarterly updates to calibration parameters, has generated a wealth of geometric performance data over the four-year on-orbit period of operations. A suite of geometric characterization (measurement and evaluation procedures) and calibration (procedures to derive improved estimates of instrument parameters) methods are employed by the Landsat-7 Image Assessment System to maintain the geometric calibration and to track specific aspects of geometric performance. These include geodetic accuracy, band-to-band registration accuracy, and image-to-image registration accuracy. These characterization and calibration activities maintain image product geometric accuracy at a high level-by monitoring performance to determine when calibration is necessary, generating new calibration parameters, and verifying that new parameters achieve desired improvements in accuracy. Landsat-7 continues to meet and exceed all geometric accuracy requirements, although aging components have begun to affect performance. Numéro de notice : A2004-536 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.836769 En ligne : https://doi.org/10.1109/TGRS.2004.836769 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27053 [article]

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Landsat-5 bumper-mode geometric correction / J.C. Storey in IEEE Transactions on geoscience and remote sensing, vol 42 n° 12 (December 2004)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 42 n° 12 (December 2004) . - pp 2695 - 2703 Titre : Landsat-5 bumper-mode geometric correction Type de document : Article/Communication Auteurs : J.C. Storey, Auteur ; M.J. Choate, Auteur Année de publication : 2004 Article en page(s) : pp 2695 - 2703 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] étalonnage géométrique [Termes IGN] miroir [Termes IGN] modèle mathématique [Termes IGN] performance [Termes IGN] radiomètre à balayage [Termes IGN] synchronisation [Termes IGN] Thematic Mapper Résumé : (Auteur) The Landsat-5 Thematic Mapper (TM) scan mirror was switched from its primary operating mode to a backup mode in early 2002 in order to overcome internal synchronization problems arising from long-term wear of the scan mirror mechanism. The backup bumper mode of operation removes the constraints on scan start and stop angles enforced in the primary scan angle monitor operating mode, requiring additional geometric calibration effort to monitor the active scan angles. It also eliminates scan timing telemetry used to correct the TM scan geometry. These differences require changes to the geometric correction algorithms used to process TM data. A mathematical model of the scan mirror's behavior when operating in bumper mode was developed. This model includes a set of key timing parameters that characterize the time-varying behavior of the scan mirror bumpers. To simplify the implementation of the bumper-mode model, the bumper timing parameters were recast in terms of the calibration and telemetry data items used to process normal TM imagery. The resulting geometric performance, evaluated over 18 months of bumper-mode operations, though slightly reduced from .that achievable in the primary operating mode, is still within the Landsat specifications when the data are processed with the most up-to-date calibration parameters. Numéro de notice : A2004-534 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.836390 En ligne : https://doi.org/10.1109/TGRS.2004.836390 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27051 [article]

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Landsat sensor performance: history and current status / B.L. Markham in IEEE Transactions on geoscience and remote sensing, vol 42 n° 12 (December 2004)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 42 n° 12 (December 2004) . - pp 2691 - 2694 Titre : Landsat sensor performance: history and current status Type de document : Article/Communication Auteurs : B.L. Markham, Auteur ; J.C. Storey, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2691 - 2694 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] enhanced thematic mapper+ [Termes IGN] Landsat [Termes IGN] multispectral scanner [Termes IGN] Thematic Mapper Résumé : (Auteur) The current Thematic Mapper (TM) class of Landsat sensors began with Landsat-4, which was launched in 1982. This series continued with the nearly identical sensor on Landsat-5, launched in 1984. The final sensor in the series was the Landsat-7 Enhanced Thematic Mapper Plus (ETM+), which was carried into orbit in 1999. Varying degrees of effort have been devoted to the characterization of these instruments and data over the past 22 years. Extensive short-lived efforts early in the history, very limited efforts in the middle years, and now a systematic program for continuing characterization of all three systems are apparent. Currently, both the Landsat-5 TM and the Landsat-7 ETM+ are operational and providing data. Despite 20+ years of operation, the TM on Landsat-5 is fully functional, although downlinks for the data are limited. Landsat-7 ETM+ experienced a failure of its Scan Line Corrector mechanism in May 2003. Although there are gaps in the data coverage, the data remain of equivalent quality to prefailure data. Data products have been developed to fill these gaps using other ETM+ scenes. Numéro de notice : A2004-533 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.840720 En ligne : https://doi.org/10.1109/TGRS.2004.840720 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27050 [article]

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