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 […]
=> 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 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. […]
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 […]
Sentinel-1A acquired an image three days after the Mw 7.8 earthquake which struck Turkey and Syria on Feb 06. The magnitude and the extent of the displacement is hard to believe (+1m vertical displacement, 100 km) but follows well the East Anatolian fault and the shakemaps generated from in situ seismic instruments. Caution: these results […]
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 » […]
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 […]
The full reprocessing of VENµS VM1 data acquired between end 2017 and end 2020 has just been completed, with improvements for the Level 1C and level 2A processing. The data can be downloaded from the Theia website : https://theia.cnes.fr by clicking on VENµS VM1 (The data from VENµS new on-going phase, with a revisit of […]
In early January 2023 the snow cover area in the Alps was lower than the 30 years minimum. The snow cover area in January 2023 was lower than the snow cover area last year at the same period. This caused the publication of a lot of depressing ski resorts photographs. But the ongoing snowfalls in […]