This is the final post of a series of studies we did to find out how far we can extend the field of view of next generation of Sentinel-2 satellites. I hope I did not lose most readers in the length of the previous posts. For the readers who land on this page, which […]
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 […]
Le CNES a publié sur LinkedIn ces jolies photos du Centre Spatial de Toulouse après le confinement. Grâce aux satellites d’observation de la Terre, les ingénieurs du CNES sont capables d’étudier la végétation aux quatre coins du globe. Mais, les cordonniers sont souvent les plus mal chaussés… Pourraient-ils étudier leur propre pelouse par satellite ? […]
In July 2018, the Pamir Times has reported that a lake formed due to a debris flow in the Ishkoman Valley, Pakistan. This event caused the destruction of dozens of housed in Badswat and Bilhanz villages. The flood debris running down the slope hit the mountain on the opposite side, and formed a barrier, blocking […]
The tropical forest is an important carbon sink which also hosts high biodiversity. Monitoring forest loss is therefore a major issue which requires efficient and accurate tools. In fact, the major challenge is to detect forest loss as precisely and quickly as possible, despite cloud cover which limits the availability of usable optical satellite imagery. […]
We are thinking of a new « live » product which would allow anyone to display the most recent snow observations from Sentinel-2 in a web browser. This service would simply display a composite of the latest Theia Snow products over a given time window (e.g. the past 20 days). This can be easily coded thanks to […]
France Bleu nous signale une impressionnante avalanche en Savoie près du Col du Glandon qui bloque la route Départementale 927. Les cartes d’enneigement distribuées par Theia permettent d’évaluer la présence de neige sur les routes de montagne grâce à leur haute résolution (pixel de 20 m). Une carte qui date du 09 mai (soit deux […]
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 […]