These maps show the area that remained covered by snow from May 01 to Sep 01 over the past three years. It was computed from Theia Sentinel-2 snow products at 20 m resolution to capture the smallest snow patches. In average there are about 1300 km2 (Lake Geneva: 680 km2) which remain snow-covered until […]
« Snow varies. » (Snow scientist proverb) Sentinel-2 enables to generate snow maps at 20 m spatial resolution. But what’s the use of such high resolution snow maps? Because one picture is worth a thousand words, I resampled some Sentinel-2 images of snow-covered regions to coarser resolutions using the average reflectance of the contributing pixels. I did […]
If you live in Pamiers near Toulouse, France, where is the snow-covered place that is the fastest accessible by car or by bike? There is a beautiful snow map of the Pyrenees mountains near Pamiers from a Sentinel-2 image that was acquired yesterday (at the time of writing) [link to the data]. In QGIS with […]
=> Since October 2019, the Theia land data center started producing monthly cloud free and almost seamless syntheses, using Sentinel-2 data acquired on the Maghreb coastal regions, from Agadir to Djerba, passing through Rabah, Alger and Tunis. These syntheses, also called Level3A products, will be delivered every month, thans to the WASP processor, which was […]
There will be no production within MUSCATE, or using the on-demand MAJA tool on PEPS, until wednesday 6th of November, as CNES HPC cluster is off for two days. An hardware and software upgrade is taking place. Il n’y aura pas de production dans MUSCATE, ou pour MAJA à la demande sur PEPS les 5 […]
The clip below shows the evolution of Pine Island glacier ice tongue in West Antarctica, from June 2017 to October 2019. I made it with 111 quicklooks of Sentinel-1 radar images processed by the Alaska Satellite Facility and available via the vertex data portal. All images were acquired in interferometric wide swath mode (polarization HH, […]
=> I will probably never go to New Caledonia, as the plane trip would spoil my carbon budget for the next 10 years. But I just had the chance to admire it from 700 km above sea level, thanks to the monthly Level 3A cloud free syntheses produced by Theia with Sentinel-2 data. As I […]
Sentinel-2 L2A products (with a good cloud mask and atmospheric correction) are produced by THEIA using the MAJA software on approximately 1000 different tiles. But this is only a small part of our big world, and we do not want to let the users alone to deal with Sen2cor poor cloud masks, outside Theia production […]
=> As announced a few months ago, our monthly synthesis processor for Sentinel-2 data, WASP, has been integrated to THEIA’s land data center processing facility at CNES, in spring 2019. We are therefore now extending the zones where we process the monthly synthesis (the so-called Level-3A products). After France, the first countries that we added […]