The operational MUSCATE starts testing Sentinel-2 Level2A production


MUSCATE is a name you may have already read on this blog. It is the processing ground segment CNES set up for THEIA land data center. We used to process SPOT (Take5), Landsat 8 or SpotWorldHeritage data with a prototype ground segment. But to produce the Sentinel-2 level 2A data we had to scale up the system. Based on the prototype feedback, CNES started the development of an operational version of MUSCATE. The development was led by Joelle Donadieu and Celine l'Helguen, and the contract was awarded to CAP GEMINI. The system also relies on CNES computing center, and of course, the Level 2A products which include atmospheric corrrection and cloud masks are based on  MACCS method.


The MUSCATE system was delivered to CNES a few weeks ago, and it is now being technically qualified. It is a fully automatic system : After a configuration phase, uploading the data to a directory triggers the data assimilation, processing, packaging and distribution to users, without human intervention.

MUSCATE just processed the available time series from Sentinel-2 above 16 different tiles in the blink of an eye.  The image on the right shows the catalog images obtained for one of these sites in South Africa.


Before the production starts, in June or July, there are still a few steps to go, including the transfer to the production team, and some bug corrections. The most annoying one appeared in the preparation of Digital Terrain models to correct for the terrain effect, which is affected by a little bug in the resampling function of GDAL Some work is still needed to mitigate this issue.


However, I am very pleased to show some of the quick looks of the products generated by MUSCATE and MACCS on Sentinel-2 data from the tile 29RNQ in Morocco, South of Marrakesh. The images of the 27th of February was taken just after a heavy snowfall, which melted quickly afterwards. This region is in fact affected by a bad drought this year. The data presented were corrected from atmospheric effects by MACCS. The detected clouds are outlined in green, the snow in pink and water in blue. All the clouds are very well detected, and false cloud detections are very scarce. The most frequent confusion, is the misclassification of partial snow cover as clouds.. The cloud shadows will be well detected with the next version of MACCS, which includes the improvements brought by Mireille Huc (CESBIO) for Take5 and Landsat 8, on MACCS prototype.


12 December 2015 18 January 2016 17 February 2016
27 February 2016 18 March 2016 16 April 2016

Du nouveau à Theia

Dans le poisson (même d'Avril), tout n'est pas bon. Rétablissons les faits :

  • Après avoir lancé le projet Theia sur de bons rails, Marc Leroy quitte bien la direction technique du projet (mais il ne sera pas bien loin...)
  • Le remplaçant de Marc pour le CNES n'est pas encore connu (mais on sait que ce n'est pas Yann Kerr)


Si vous tenez malgré tout à lire mes élucubrations poissonnières :

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PEPS et Theia

  • Theia a publié un nouveau bulletin d'informations, dans un format très pro, esthetique et bien agréable à lire.
  • PEPS a commencé à relayer les données Sentinel-2, sur le monde entier. PEPS est le "Segment sol collaboratif" français, qui fournit un miroir de toutes les données Sentinel acquises dans le monde. Vous y trouverez probablement une bande passante plus importante, et une interface plus agréable que sur le site Scihub. Les données, elles sont identiques. Elles sont mises à jour en quelques heures.

  • Theia just issued its newsletter, in a new, beautiful and easy to read format (but in French).
  • PEPS started re-distributing Sentinel-2 data, over the world. PEPS is the French "Sentinel Collaborative Ground Segment", which provides a mirror of all the Sentinel data available over the world. Your downloads will probably be quicker and the interface is really easy even to make automatic downloads. The data are identical to those of Scihub, and are updated in a couple of hours.


SPOT5 (Take5) last images have been taken


The SPOT5 (Take5) experiment ended today around 12 (UTC). Sintce the 8th of avril, about 5000 images were acquired on 150 sites every 5 days. Finally, everithing work without too many incidents, even if the first weeks were full of surprises. This work implied a lot of people to obtain the project funding and decision, to demonstrate the feasibility, to prepare the project, update the software, program and monitot the acquisitions, process and distribute the data. I would like to thank here all the people at CNES, ESA, Airbus Defense and space, and in the companies involved in this successful project.


On September the 2nd, two months after the distribution opening, and in a holiday period, you were already 208 users to have downloaded some of SPOT5 (Take5) data.
And by the way, the SPOT5 (Take5) experiment is far from its end, as the using phase is only starting. I would be very happy to publish on this blog your first impressions, ideas or results.


Finally, please do not forget the "special event" dedicated to SPOT5 (Take5) within the Living Planet Symposium, in Prague, during the 9-13 May period in 2016. Your abstracs are awaited before October the 16th 2015, one month from now.