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New version of SPOT-5 Take 5 L2A dataset

08 April 2016

In 2015 ESA and CNES jointly conducted a dedicated acquisition campaign with the SPOT-5 satellite. Before its final de-orbiting, the spacecraft was manoeuvred to a lower orbit to simulate the 5 days revisit of Sentinel-2. The imagery over all selected acquisition sites is freely available to the worldwide user community.

The SPOT-5 (Take 5) project just released a new version of all SPOT-5 (Take 5) L2A data to account for several small issues encountered during the first reprocessing:

  • for two very bright desert sites (Libya, Tunisia), one cloud threshold was too low, and large parts of the desert were classified as clouds. The threshold has been changed specifically for these two sites.
  • the level 2A of Northern sites with a persistent snow cover were not issued. It has been solved, but as it is not possible to estimate aerosols above snow, they have been processed with a default Aerosol Optical Thickness value, as long as they are fully covered by snow.
  • the shadows below large clouds were often not detected. The shadow detection method has been completely reworked resulting in largely enhanced cloud shadow masks. More information on this is available in the CESBIO blog.
  • the Aerosol Optical Thickness images were a little too noisy, and the spatial smoothing of the values has been increased.
  • one site had been omitted because of a problem of DTM, which had been unnoticed (the processor is a prototype): BrailaCasasuRomania
  • one site (DevonUK) had a poor geometry because of a bad reference image. The reference image has been changed and the level 1C and level 2A data have been reprocessed.

The older version has been removed from the SPOT-5 Take 5 site and replaced by the newer. In order to avoid confusion between the older and newer version, you may check that the HTML tag contains 2016 instead of 2015.