Introduction To perform a correction of directional effect, directional models are required. A large number of directional models have been developed, such as the ones of Roujean [1] or Ross-Li [2], that try to reproduce the directional variations as a function of viewing angles and solar angles, with a rather good accuracy for most types […]
Question: The color image displayed on the left is a new kind of RGB composite image, can you guess how it was made ? Hints: the blue bright pixels correspond to water, but water is not bright usually… except if it is obtained in specular condition, when the water surface mirrors the sun towards the […]
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 […]
Une nouvelle méthode d’estimation d’attitude a été développée pour le satellite VENµS, basée uniquement sur le contenu des images. La qualité de superposition peut ainsi être améliorée d’un facteur 10, ouvrant la voie à de nouvelles applications. Depuis son lancement en aout 2018, le satellite pushbroom franco–israélien Venµs est affecté par un bruit de restitution […]
=> 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 […]
=> Voilà voilà, suite à de nombreuses demandes, nous avons trouvé le moyen de rajouter la grande île de Madagascar dans les zones traitées par Theia, notamment pour les besoins de Geodev. Les traitements avec la chaîne MAJA ont démarré il y a quelques jours, avec les données acquises fin décembre 2016 par Sentinel-2. Ils […]
=> 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 […]