En Français
=> Le Million ! Si vous calculez la somme des nombres de produits distribués par le CNES pour THEIA, vous pourrez voir que notre centre distribue maintenant plus d’un million de produits (1 000 000 !). Les lecteurs qui suivent ce blog se souviennent peut-être de nos difficultés initiales, qui nous poussaient à célébrer les […]
Applications
(article publié aussi sur le site du labo-OT au CNES) Pourquoi s’intéresser à l’orientation des cultures agricoles ? Au moins pour deux raisons. L’orientation des cultures par rapport à la pente du terrain contribue de façon importante au risque de ruissellement intense et par voie de conséquence à l’érosion des sols. Par ailleurs, connaitre l’orientation des […]
In English
Downloading time series from Theia can take a while, depending on the area and the time period covered by the images. Also, it consumes a lot of storage locally, since all the archives in .zip format have to be downloaded (the GeoDataHub will probably distribute Cloud Optimized Geotifs). From my experience, a lot of people […]
In English
We have had to cancel the production of VENµS L1C and L2A products for one month, because the footprints of VENµS images tend to change more than anticipated. The ground segment recognizes the sites by the coordinates of the corners, and the tolerances were not large enough. This problem has been understood and corrected by […]
En Français
=> Contexte En 2021, le CNES a décidé de mettre en œuvre un hub de services autour de la diffusion des données satellitaires d’Observation de la Terre (OT). Intégré dans un écosystème national et européen, dans le cadre de Data Terra et au service des communautés scientifiques et des projets du CNES, le projet Geo […]
In English
In Turkey, the Disaster and Emergency Management Presidency (AFAD), affiliated to the Ministry of Interior, has completed the installation of 300 thousand tents in the provinces affected by the earthquakes. On Feb 16, Pléiades captured such installation on the parking of the New Hatay Stadium near Antakya. I count about 400 tents in this picture. […]
In English
We received satellite images of Antakya, Turkey acquired by Pléiades 10 days after the earthquake. The comparison with pre-event imagery leaves me speechless. The post-event images were acquired by Pléiades PHR1A thanks to CNES Cellule d’Intervention et d’Expertise Scientifique et Technique nouvelle génération : CIEST² (https://www.poleterresolide.fr/ciest-2-nouvelle-generation-2/). I rectified the raw images using the SRTM digital […]
In English
The low predictability of agricultural cycles in semi-arid regions [1]. In the early 2010s, chaotic attractors were captured for the cycles of cereal crops in North Morocco. This result was unexpected for several reasons. It was the first time a chaotic attractor was obtained from remote sensing data. It was also the the first « weakly dissipative » […]
In English
International news media reported that the Joshimath city in north India (Uttarakhand) was « sinking » due to a slow landslide. In January, many houses had developed major cracks on the walls and 145 families were temporarily moved. The Indian space agency published a map of the ground deformation obtained by SAR interferometry using Sentinel-1 data. Although […]