=> At CESBIO, we are developing land cover map production techniques, for high resolution image time series, similar to those which will soon be provided by Venµs and Sentinel-2. As soon as the SPOT4 (Take5) data were available over our study area (Sudmipy site in South West France), we decided to assess our processing chains […]
=> This post is an old one (last year), but I had not translated it. The satellites observing the Earth at a high resolution may be divided in two categories according to their programming mode : Users ask the provider to program an image above their site. The provider collects all demands and optimises the acquisition […]
=> Voilà ! The new version (V2.0) of SPOT4-Take5 data set is available, for the 45 sites. I would like to thank the development and processing teams of MUSCATE center in CNES, who work for THEIA, the image quality teams at CNES (SI/QI and SI/MO), and of course Mireille Huc at CESBIO, for the production […]
The SPOT4 (Take5) reprocessing nears its end at THEIA. All the Level 2A products have been produced, but for 4 sites (Provence, Alpes, Sudmipy E and W), for which the processing is on-going. We are now transfering the data to the distribution server. It should take just a few days. Le retraitement de SPOT4 […]
=> Among Sentinel-2, LANDSAT, Venµs or SPOT4 (Take 5) features, there is one which is frequently forgotten: it is the possibility to observe all lands every Nth day under constant viewing angles. This way of observing limits the directional effects which are one of the most perturbing effects for reflectance time series. Yet, these effects […]
Le retraitement des données SPOT4 (Take5) est en cours dans le centre MUSCATE de THEIA, au CNES. Les niveaux 1C ont été produits, le traitement des niveaux 2A commence aujourd’hui. Nous avons perdu une semaine avec un bug qui a été trouvé à la dernière minute sur des données FORMOSAT-2, et bien qu’il ne soit […]
=> We are very proud to tell that our consortium was selected by ESA for the S2-Agri call for tender. Our consortium is built from the following partners : The S2-Agri project, whose website was just created, aims at showing on a large scale project, the capabilities of Sentinel-2 mission for agriculture monitoring, by providing, after […]
=> Among the products prepared to be processed by the THEIA land data center, the level 3A product was not yet described in this blog. The level 3A products provide a monthly synthesis of the level 2A. These products should be very useful for the following reasons : Thanks to SPOT4 (Take5) data set, we […]
=> Many users are confused by the earth observation product names. Maybe detailing the logic behind the names will help recall them. Here is how the THEIA Land Data Center product names were chosen. Let’s first recall that several Earth observing missions do not respect the CEOS norms, often because their nomenclature was defined before […]