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A Complete Orthorectified Landsat-7 Mosaic of the Canadian Arctic Archipelago-Devon Island-Landsat Thematic Mapper Bands 3,2,1(as R,G,B) (True Color Composite)

Open.Canada.Ca URL

http://open.canada.ca/data/en/dataset/00c39171-b303-599b-be3b-1b19ddfe1ac1

Main URL

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Resources:

Notes

A 30-metre resolution mosaic of the Canadian Arctic Archipelago and much of the mainland Arctic coast was assembled from a careful selection of the best snow-free and seasonally close summer Landsat-7(ETM+) images from 1999-2002 (prior to problems with the scanning mirror). Where haze or cloud persist, no other cloud-free Landsat-7 data was available from CCRS or USGS archives to reveal the land surface. This seamless mosaic was orthorectified from 277 single scenes in strips using state-of-the-art rectification processes which employed 1:250,000 and 1:50,000 scale elevation models, precise ground control points (9,100) as well as conjugate tie points (1,500) between the overlapping orbit passes. Geometric tests performed using GCP, vector shape data and statistical analysis has demonstrated that the process correctly determined and compensated for the satellite orbit error and preserved the radiometric integrity of the data. The residual ground position errors resulting from the adjustments show consistent errors under 8.0 metres RMS in X and Y. The ground position errors are relative to the best ground control points available, which typically had uncertainties on the order of 5 meters. Thus, absolute overall accuracy of the mosaic at the 90% confidence level is on the order of 20 metres, which is sub-pixel. Gibson and Nedelcu (2008) describe the procedure in greater detail and provide a more complete accuracy assessment. This product resulted from an expansion of the Baffin Island Landsat mosaic created under the Northern Resource Development Program in the Earth Sciences Sector of Natural Resources Canada with key support provided by the Canada-Nunavut Geoscience Office. The completed mosaic of the archipelago was carried out under the Secure Canadian Energy Supply Program in the Earth Sciences Sector of Natural Resources Canada with some additional support provided by the Canadian Space Agency through the Government Related Initiatives Program. Due to the file size, the mosaic is tiled into 10 regional parts; each contains all 30-metre multi-spectral Landsat bands. A single file covering the entire region at lower resolution is also available. Gibson, J.R. and S. Nedelcu. 2008. An improved approach for the production of satellite-based geospatial reference imagery. International Journal of Digital Earth. vol. 1, no. 2, pp.221-239.

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            [fr] => Une mosaïque à résolution de 30 mètres de l'archipel Arctique canadien et d'une grande partie de la côte de l'Arctique continental a été constituée grâce à une sélection rigoureuse des meilleures images Landsat 7(ETM+) acquises pendant des périodes sans neige et le plus possible au cours des saisons estivales entre 1999 et 2002 (avant que ne surviennent des problèmes liés au miroir du balayeur multispectral). La présence de brume ou de nuages par endroits s'explique du fait qu'aucune autre donnée Landsat 7 exempte de nuages n'était disponible dans les archives du CCT ou de l'USGS, qui aurait permis une vue dégagée de la surface terrestre. L'orthocorrection de cette mosaïque continue a été réalisée à partir de 277 scènes individuelles en bandes au moyen de processus de correction à la fine pointe, utilisant des modèles altimétriques aux échelles de 1/250 000 et 1/50 000, des points de contrôle au sol précis (9 100), ainsi que des points de rattachement conjugués (1 500) entre les passages orbitaux chevauchants. Des essais portant sur la géométrie, effectués à l'aide de points de contrôle au sol, de données en format vectoriel et d'analyses statistiques, ont démontré que le processus permettait de déterminer correctement et de compenser l'erreur sur l'orbite des satellites, ainsi que de conserver l'intégrité radiométrique des données. Les erreurs résiduelles sur le positionnement au sol, dues aux compensations, révèlent des erreurs constantes inférieures à 8,0 mètres (erreur quadratique moyenne) en X et en Y. Les erreurs de positionnement au sol dépendent des meilleurs points de contrôle au sol disponibles, qui présentaient habituellement des incertitudes de l'ordre de 5 mètres. Par conséquent, l'exactitude absolue pour l'ensemble de la mosaïque au niveau de confiance de 90 % est de l'ordre de 20 mètres, soit moins d'un pixel. Gibson et Nedelcu (2008) décrivent plus abondamment la procédure et fournissent une évaluation plus complète de l'exactitude. Le produit résulte du prolongement de la mosaïque Landsat de l'île de Baffin créée dans le cadre du Programme de mise en valeur des ressources du Nord du Secteur des sciences de la Terre de Ressources naturelles Canada, soutenu principalement par le Bureau géoscientifique Canada-Nunavut. La mosaïque complète de l'archipel a été réalisée dans le cadre du programme Sécurité de l'approvisionnement énergétique du Canada du Secteur des sciences de la Terre de Ressources naturelles Canada, avec un appui supplémentaire du Programme d'initiatives gouvernementales en observation de la Terre de l'Agence spatiale canadienne. En raison de la taille du fichier, la mosaïque est structurée en pavés représentant 10 divisions régionales; chaque pavé contient toutes les bandes multispectrales Landsat à résolution de 30 mètres. Une couverture de toute la région est également disponible en un seul fichier à moins grande résolution. Gibson, J.R. and S. Nedelcu. 2008. An improved approach for the production of satellite-based geospatial reference imagery. International Journal of Digital Earth. vol. 1, no. 2, pp.221-239.
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