[Nouvelles de MUSCATE] Un été très productif

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Mise à jour le 4 octobre 2018

Cet été, alors que la plupart d'entre nous prenions des coups de soleil sur la plage, nous faisions dévorer par des moustiques, attrapions des courbatures en rando, ou faisions de longues siestes pour nous remettre de nuits fatigantes, les équipes de production et de distribution de MUSCATE ont eu la chance de bénéficier d'une climatisation efficace, de fauteuils confortables, d'ordinateur rapides et de l'accès à la meilleure cantine du monde au CNES. Il n'est donc pas surprenant que la production ait fait de gros progrès, mais nous pouvons néanmoins leur adresser un grand merci, car les résultats sont impressionnants.

 

Amélioration des performances de production

Theia's L2A counter reached 100 000 images on August 12th

 

Tout d'abord, l'anomalie qui avait perturbé la production à la fin du printemps a été résolue. C'était un problème de capacité de mémoire sur la machine qui héberge le catalogue interne de MUSCATE. Petit à petit, la besoin de mémoire dépassait le volume prévu, et les performances se dégradaient avant que le système ne plante, quasiment tous les jours. Il a suffi de quelques ajustement et d'un doublement de la mémoire pour que le problème disparaisse.

Ainsi, depuis début juillet, MUSCATE n'a plus connu que deux courtes interruptions dues à une phase de maintenance du centre informatique du CNES. Comme on peut le voir sur la figure qui suit,  la courbe orange, qui moyenne la production sur un mois n'a jamais été aussi haute, depuis le démarrage de la production.

 

Number of L2A produced each day by MUSCATE (after removing the products with more than 90% of clouds)

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[MUSCATE News] A very productive summer

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Updated on October 4th

 

This summer, while most of us were getting sunburnt near the coast, or getting sore legs after hiking in mountains, or having long naps after hectic nights, the lucky MUSCATE teams stayed at work, with a good and efficient air conditioning, convenient armchairs, fast computers and accessed to the best canteen in the world at CNES. So it's no surprise they progressed a lot in all aspects, but even if they benefited from perfect conditions, we should thank them a lot.

 

Improved production performances

Theia's L2A counter reached 100 000 images on August 12th

 

First of all, the colleagues solved the issue that delayed a lot MUSCATE production in late spring. It was a memory issue, with a heavy swap consumption that slowed then crashed the MUSCATE ground segment. Doubling the available memory on the catalogue server solved the issue.

As a result, since beginning of July, MUSCATE had only two interruptions of production, due to maintenance interventions on the CNES platform. As it may be seen below, the monthly average plot in orange shows that the production rate is at its best in two years.

 

Number of L2A produced each day by MUSCATE (after removing the products with more than 90% of clouds)

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On-demand SENTINEL2 L2A processing with MAJA on PEPS

Update : added a script to submit and download MAJA jobs on PEPS

 

Getting a Sentinel-2 L2A product (with atmospheric correction and cloud detection) anywhere has never been so easy.  Until now, you had two options to access to Sentinel-2 L2A products obtained from the MAJA processor :

 

 

Starting from today, there is another possibility: an on-demand MAJA processing from the French Sentinel collaborative ground segment PEPS.  The possibility is a proof of concept, and if a lot of people use it at once, we do not know how the processing time will evolve. But the only way to know it is to try it, hoping the processing and download capacity is sufficient. Anyway, it you intend to process a whole country, we hope you are from Belgium, and not from Australia.

 

However, if your site is above 60°N or under 60°S, you are still unlucky, as MAJA needs SRTM DEM to work. We will try to implement the use of Arctic DEM one day.

 

PEPS/MAJA processing page (don't worry, english language is also available)

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