Protégé : Should we remove the constraint of constant viewing angles on Sentinel-2 NG ?
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MAJA and the new CAMS aerosols 48r1
The Copernicus Atmospheric Monitoring Service (CAMS) is about to release a new version of its aerosol products on 27 June 2023, referred as 48r1. Their evolution has a direct impact on MAJA, and requires us to adapt the processor. MAJA will not be ready to support 48r1 before the next MAJA release scheduled for September […]
Reappearance of the Dnieper river after the destruction of Kakhovka dam
The Kakhovka Reservoir was created in 1956. As the level of the reservoir drops at a staggering rate of two meters per day, it is now possible to see the ancient river reappear in satellite images. I have georeferenced a 1943 German military map published by Defense Express in their article « 1943 Maps Show What […]
Rupture du barrage de Kakhovka : que nous montrent les satellites ?
La rupture du barrage de Kakhovka au sud de l’Ukraine a eu lieu tôt le matin du 6 juin 2023. L’évolution de la hauteur d’eau du lac mesurée par altimétrie satellite est disponible sur Hydroweb. On peut constater que le niveau du lac est passé de 13,80 m le 8 juin à 08:18 à 11,86 […]
Découvrir les structures cachées du paysage grâce au lidar
Le lidar est magique ! Cette technologie permet de mesurer très précisément l’altitude du sol y compris sous la végétation. Voici un exemple qui montre des sentiers cachés dans une forêt du Jura : L’image en teintes de gris est un « hillshade » c’est-à-dire un ombrage du relief. Ce relief est issu du RGE ALTI […]
A new article on the validation of MAJA’s Sentinel-2 surface reflectances
Whether you are a user of the atmospheric correction processor MAJA or THEIA’s Sentinel-2 Level 2 products, you will probably be interested to read our new article on the validation of MAJA Sentinel-2 surface reflectances. The article is published in open access in Remote Sensing : Colin, J.; Hagolle, O.; Landier, L.; Coustance, S.; Kettig, […]
Protégé : Un nouveau domaine scientifique : la comitologie
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Artificial snow accumulation detected from space
People often ask if we can detect artificial snow in satellite images. It’s not so easy except when the surrounding slopes are totally snow-free… But recently, I noticed some anomalous snow accumulations patterns in one of my satellite-derived snow depth maps near Super Barèges ski resort (Pyrenees). I made this snow depth map from a […]
Geodes, the next generation access platform for CNES EO data.
=> Context In 2021, CNES decided to implement a service hub for the dissemination of Earth Observation (EO) satellite data. Integrated in a national and European ecosystem, in the framework of Data Terra and at the service of scientific communities and CNES projects, the GeoDataHub project (GDH, which has more recently been renamed Geodes) will […]