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Proceedings Paper

Sentinel-2A image quality commissioning phase final results: geometric calibration and performances
Author(s): F. Languille; A. Gaudel; C. Dechoz; D. Greslou; F. de Lussy; T. Trémas; V. Poulain; S. Massera
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Paper Abstract

In the frame of the Copernicus program of the European Commission, Sentinel-2 offers multispectral high-spatial-resolution optical images over global terrestrial surfaces. In cooperation with ESA, the Centre National d’Etudes Spatiales (CNES) is in charge of the image quality of the project, and so ensures the CAL/VAL commissioning phase during the months following the launch. Sentinel-2 is a constellation of 2 satellites on a polar sun-synchronous orbit with a revisit time of 5 days (with both satellites), a high field of view - 290km, 13 spectral bands in visible and shortwave infrared, and high spatial resolution - 10m, 20m and 60m. The Sentinel-2 mission offers a global coverage over terrestrial surfaces. The satellites acquire systematically terrestrial surfaces under the same viewing conditions in order to have temporal images stacks. The first satellite was launched in June 2015. Following the launch, the CAL/VAL commissioning phase is then lasting during 6 months for geometrical calibration. This paper will point on observations and results seen on Sentinel-2 images during commissioning phase. It will provide explanations about Sentinel-2 products delivered with geometric corrections. This paper will detail calibration sites, and the methods used for geometrical parameters calibration and will present linked results. The following topics will be presented: viewing frames orientation assessment, focal plane mapping for all spectral bands, results on geolocation assessment, and multispectral registration. There is a systematic images recalibration over a same reference which is a set of S2 images produced during the 6 months of CAL/VAL. This set of images will be presented as well as the geolocation performance and the multitemporal performance after refining over this ground reference.

Paper Details

Date Published: 14 December 2016
PDF: 21 pages
Proc. SPIE 10000, Sensors, Systems, and Next-Generation Satellites XX, 100000F (14 December 2016); doi: 10.1117/12.2236313
Show Author Affiliations
F. Languille, Ctr. National d'Études Spatiales (France)
A. Gaudel, Ctr. National d'Études Spatiales (France)
C. Dechoz, Ctr. National d'Études Spatiales (France)
D. Greslou, Ctr. National d'Études Spatiales (France)
F. de Lussy, Ctr. National d'Études Spatiales (France)
T. Trémas, Ctr. National d'Études Spatiales (France)
V. Poulain, Thales Services (France)
S. Massera, Institut Géographique National (France)

Published in SPIE Proceedings Vol. 10000:
Sensors, Systems, and Next-Generation Satellites XX
Roland Meynart; Steven P. Neeck; Toshiyoshi Kimura, Editor(s)

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