=> Very recently, Camille Desjardins (from CNES), who is handling the validation of the L2A products generated by THEIA, has set up a systematic validation of the products delivered by MAJA, with the help of an operational service from CNES (OT/PE) (Bruno Besson, and Nicolas Guilleminot from Thales Services, using tools developed by Aurélie Courtois, […]
=> The main difficulty of the atmospheric correction comes from the determination of the aerosols optical properties: one has to know the optical properties of the aerosol type present in the atmosphere and determine their optical thickness. Using Sentinel-2 data to determine the aerosol type is very complicated, and our MAJA processor, used to generate […]
As MACCS was used to produce a large amount of images (all the images acquired over France), we were able to make some more validation tests, such as checking the surface reflectance stability. To do that, the region of Arles in Provence (France), tile 31TFJ, is a good site, with a lot of clear skies, […]
=> You will find the latest documentation and useful links on the new MAJA website. MACCS (Multi-sensor Atmospheric Correction and Cloud Screening) is a level 2A processor, which detects the clouds and their shadows, and estimates aerosol optical thickness (AOT), water vapour and corrects for the atmospheric effects. The processor was jointly developed by CESBIO […]
=>Suite à l’expérience de pilotage d’irrigation menée au Maroc lors de l’expérience SPOT4-Take5 (Le Page et al, 2014), un outil Web d’aide à la prise de décision d’irrigation est en cours de développement (http://osr-cesbio.ups-tlse.fr/Satirr). L’outil est fonctionnel sur trois tuiles Landsat8 situées à Marrakech au Maroc, Kairouan en Tunisie, Toulouse en France. L’outil s’adresse à des […]
=> I already explained in this blog the principles of estimation of the aerosol optical thickness that we use to process the LANDSAT or SPOT5 (Take5) data, and soon Venµs or Sentinel-2 data, within the MACCS method developed at CESBIO, and used at CNES by THEIA. We started writing an article in 2010 to explain […]
=> Since Christmas (almost, December 23rd), USGS distributes LANDSAT 8 data corrected from atmospheric effects, as they already did for LANDSAT 5 and 7. These data have been long awaited and will be very useful. Of course, USGS processing addresses the whole world. To access these products, you should use the earthexplorer.server. You will find the […]
=> As for LANDSAT 8 a few weeks ago, we just produced the level 2A products for the LANDSAT 5 et LANDSAT 7 data acquired above France from 2009 to 2011. This data set will be released in a few days, when its transfer to the distribution server has ended. The MUSCATE team took charge […]
=> That was fast ! The processing of all the LANDSAT 8 images taken above France in 2013 took less than 15 days. The first LANDSAT 8 images were taken in April 2013. The MUSCATE team processed the data for the THEIA land data center, using CNES computing center. A few more days will be necessary […]