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Auteur B. Markham |
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Landsat-7 long-term acquisition plan radiometry: evolution over the time / B. Markham in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 10 (October 2006)
[article]
Titre : Landsat-7 long-term acquisition plan radiometry: evolution over the time Type de document : Article/Communication Auteurs : B. Markham, Auteur ; S. Goward, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1129 - 1135 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] bande spectrale
[Termes IGN] image Landsat-ETM+
[Termes IGN] mission spatiale
[Termes IGN] nébulosité
[Termes IGN] saturation de la couleur
[Termes IGN] surveillance météorologiqueRésumé : (Auteur) The Landsat-7 Enhanced Thematic Mapper Plus instrument has two selectable gains for each spectral band. In the acquisition plan, the gains were initially set to maximize the entropy in each scene. One unintended consequence of this strategy was that, at times, dense vegetation saturated band 4 and deserts saturated all bands. A revised strategy, based on a land-cover classification and sun angle thresholds, reduced saturation, but resulted in gain changes occurring within the same scene on multiple overpasses. As the gain changes cause some loss of data and difficulties for some ground processing systems, a procedure was devised to shift the gain changes to the nearest predicted cloudy scenes. The results are still not totally satisfactory as gain changes still impact some scenes and saturation still occurs, particularly in ephemerally snow-covered regions. A primary conclusion of our experience with variable gain on Landsat-7 is that such an approach should not be employed on future global monitoring missions. Copyright ASPRS Numéro de notice : A2006-425 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.10.1129 En ligne : https://doi.org/10.14358/PERS.72.10.1129 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28149
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 10 (October 2006) . - pp 1129 - 1135[article]