=> Now that Sentinel-2A has started to acquire time series over Europe, we have been able to try our MACCS Level 2A processor to perform atmospheric corrections. As you probably know if you have been following this blog, MACCS works with time series to detect clouds, shadows, water and estimate aerosols optical thickness. Our processor therefore […]
As promised, the SPOT5 (Take5) L2A data acquired before the 3rd of June have just been uploaded to https://spot-take5.org The file format for both Level 1C and Level 2A is available here.Some explanations on how the the distribution server works is available here.
=> These figures are the overall rhythm of production for SPOT5 (Take5) for Level 1C and level 2A production, in the MUSCATE factory within the CNES computing center. But it is a pity that conditioning the data to upload them on the distribution center (https://spot-take5.org) is in fact much longer (several minutes per product). It is […]
=>Ce sont les cadences de production de chaque donnée SPOT5 (Take5), au N1C, puis au N2A, dans l’usine MUSCATE implantée au centre informatique du CNES. Ce qui est dommage, c’est que finalement, le temps de préparation des données pour les mettre sur le serveur de distribution (https://spot-take5.org), et les temps de transfert des fichiers par réseau sont […]
Everything is set to start SPOT5 (Take 5) operational production of L1C products today (L1C products are ortho rectified images expressed in Top of Atmosphere reflectance). The Level 2A production will start a couple of days later, when all the L1C of April and May are produced (L2A products provide surface reflectances and cloud and […]
=>Comme vous le savez si vous avez suivi ce blog, notre méthode de détection de nuages et de corrections atmosphériques, appelée MACCS, utilise fortement l’information temporelle. Elle fait l’hypothèse qu’au dessus des terres, les réflectances dans le bleu ne changent pas rapidement avec le temps, à quelques exceptions près, en général liées à des […]
=> As you already know if you have been following this blog, our L2A method for cloud detection and atmospheric correction, named MACCS, makes a large use of multi-temporal information. It assumes that over lands, the surface reflectances in the blue do not change quickly with time, except on some exceptions that have to be […]
Airbus Defence and Space (Ex Spot Image), produces every week the new data downloaded from the satellite to level 1A (Thanks Myriam !). We have now received nearly two entire cycles of SPOT5 (Take5) images, which means that we have our first time series, although made of only two dates ! Our processing center, MUSCATE, within […]
=>Voici une copie d’écran de la première image SPOT5 (Take5) du lac Victoria en Ouganda, après ortho-rectification (L1C), superposée à une image similaire acquise par LANDSAT 8. Les deux images se superposent apparemment très bien, même si nous devons procéder à une validation plus rigoureuse. Ceci dit, même si ce n’est pas une surprise, […]