Remote Sensing | |
SPOT-4 (Take 5): Simulation of Sentinel-2 Time Series on 45 Large Sites | |
Olivier Hagolle4  Sylvia Sylvander2  Mireille Huc4  Martin Claverie3  Dominique Clesse6  Cຜile Dechoz2  Vincent Lonjou2  Vincent Poulain5  Benjamin Koetz1  Richard Müller1  | |
[1] Centre d’études Spatiales de la Biosphère, CESBIO Unite mixte Université de Toulouse-CNES-CNRS-IRD, 18 avenue E.Belin, 31401 Toulouse Cedex 9, France; E-Mail;CNES, 18 avenue Edouard Belin 31401 Toulouse Cedex 9, France; E-Mails:;NASA GSCF, Code 619, Bldg 32, N149-6, Greenbelt, MD 20771, USA; E-Mail:;Centre d’études Spatiales de la Biosphère, CESBIO Unite mixte Université de Toulouse-CNES-CNRS-IRD, 18 avenue E.Belin, 31401 Toulouse Cedex 9, France; E-Mail:;Thales Services, 3 avenue de l’Europe - Bat. D, 31400 Toulouse, France; E-Mail:;Capgemini Technology Services, 109 avenue Eisenhower - BP 53655, 31036 Toulouse Cedex 1, France; E-Mail: | |
关键词: Sentinel-2; SPOT-4 (Take 5); time series; repetitivity; image registration; cloud detection; atmospheric correction; surface reflectance; validation; | |
DOI : 10.3390/rs70912242 | |
来源: mdpi | |
【 摘 要 】
This paper presents the SPOT-4 (Take 5) experiment, aimed at providing time series of optical images simulating the repetitivity, the resolution and the large swath of Sentinel-2 images. The aim was to help users set up and test their applications and methods, before Sentinel-2 mission data become available. In 2016, when both Sentinel-2 satellites are operational, and for at least fifteen years, users will have access to high resolution time series of images systematically acquired every five days, over the whole Earth land surfaces. Thanks to Sentinel-2’s high revisit frequency, a given surface should be observed without clouds at least once a month, except in the most cloudy periods and regions. In 2013, the Centre National d’Etudes Spatiales (CNES) lowered the orbit altitude of SPOT-4, to place it on a five-day repeat cycle orbit for a duration of five months. This experiment started on 31 January 2013 and lasted until 19 June 2013. SPOT-4 images were acquired every fifth day, over 45 sites scattered in nearly all continents and covering very diverse biomes for various applications. Two ortho-rectified products were delivered for each acquired image that was not fully cloudy, expressed either as top of atmosphere reflectance (Level 1C) or as surface reflectance (Level 2A). An extensive validation campaign was held to check the performances of these products with regard to the multi-temporal registration, the quality of cloud masks, the accuracy of aerosol optical thickness estimates and the quality of surface reflectances. Despite high
【 授权许可】
CC BY
© 2015 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
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RO202003190005939ZK.pdf | 6228KB | download |