The epidemic of Covid-19 and its bulletins In this post, a brief analysis of the epidemic of Coronavirus Covid-19 that broke out in Wuhan (China) on last December 2019 is sketched. More specifically, this analysis originally focused on the period January 31st to February 27th and was then extended by Bulletins. Bulletins Last Bulletin: Bulletin […]
That’s unfair ! Sentinel-2 is a lucky satellite who still can visit Spain, Italy or Portugal every 5th day, while we are locked at home. Thanks to the hard work and good organisation at ESA (for the Level-1 products) and CNES (for the advanced L2A and L3A products), I have been able to generate mosaics […]
A single VENµS acquisition is sufficient to estimate the terrain elevation of a scene thanks to the so-called « native stereo » technique. One of the main missions of VENµS, the Franco-Israeli satellite launched in August 2017, is to carry out acquisitions over more than a hundred scientific sites around the world. Its resolution at 5.3 m […]
=> A new attitude estimation method has been developed for the VENµS satellite, based solely on image content. The registration quality can thus be improved by a factor of 10, paving the way for new applications. Since its launch in August 2018, the Franco-Israeli Venµs pushbroom satellite has been affected by attitude restitution noise that […]
Suomi/VIIRS had a nice view of snow in the Alps today, 60 years after the first TIROS image. Thanks to all space agencies for providing us great data to study snow. And thanks to Richard Essery for the tip!
NO2 emissions are rising again over China, showing the slow recovery of Chinese industry after a two-month shutdown. The graph below was obtained from Sentinel-5p data using the NO2 time series Google Earth Engine app.
=> Here it comes ! Following numerous demands, we found ressources to add the great island of Madagascar to the list of zones processed by Theia. The processing with MAJA started a few days ago, with the data acquired in December 2016 by Sentinel-2. The start was only slightly delayed by the current lockdown in […]
=> The L2 products from the Maja chain are regularly evaluated for their quality, whether in terms of cloud detection, optical thickness estimation or surface reflectance estimation. While the validation of the cloud masks is essentially based on the tedious creation of sets of controls (manual or semi-automatic), the estimation of the optical properties of […]
Yes, so far MUSCATE is winning against COVID ! MUSCATE is THEIA land data production center in CNES. Although everyone in the production and development team is working from home, in good health so far, the production is still on, as you may see on the counters. We even passed the 10 000 products milestone […]