=> Three and a half months after the first release of SPOT4 (Take5) products, we can draw a first analysis of the SPOT4(Take5) data downloads (from THEIA distribution website : http://spirit.cnes.fr/take5/) We have also obtained a ranking of the 45 sites versus the number of downloads, and notice that all 45 sites where at least […]
Our colleagues from ESA/ESRIN are organizing a new workshop to discuss the status of the preparation of Sentinel-2 scientific applications and methods. The three days workshop will be held at ESA/ESRIN premises, next May in Frascati, near Rome. It would be good to have some talks and posters about the results obtained from SPOT4(Take5) experiment. […]
=> We are currently preparing a data reprocessing of all SPOT4 (Take5) data, to be released before the end of 2013. For this, I tested several aerosol models and compiled all the validation results for our multi-temporal Aerosol Optical Thickness (AOT) estimation method named MACCS. Our estimates are compared to AERONET in-situ AOT measurements.The MACCS […]
=> The CIRAD research institute studies the North Congo rain forests, and uses satellite image time series to tell mainly deciduous forests from mainly evergreen forests, The analysis or 10 years of a vegetation index time series (Enhanced Vegetation Index – EVI) from MODIS images at 500m resolution, was used to produce a synthetic annual […]
Voici les présentations de la Journée SPOT4 (Take5) du 2 octobre, qui a réuni une centaine de personnes au CNES pour faire un bilan des acquisitions et des produits distribués, et prendre connaissance des premiers retours des utilisateurs. J’en profite pour remercier les deux organisatrices, Sylvia Sylvander et Danielle Barrère, du CNES (DCT/ME/OT), les 23 […]
=> This discreet bug was spotted by Mireille Huc a couple of weeks ago, but it had been bothering all SPOT4(Take5) data users for2 months : the L2A products were twice larger than necessary. The bug occurred when converting data to GeoTIFF format, it happened only on the production computer and not on the test […]
Caution, this post contains math formulas. => Terrain effects are one of the disrupting elements of surface reflectance retrieval. This can be easily checked with the image below. The topographic (or terrain) effects on the observed reflectances are due to several phenomena, illustrated below : The surfaces also receive a diffuse sun irradiance scattered by […]
I had the opportunity to participate to the ESA Living Planet Symposium, in Edinburgh, last week, together with 1800 other remote sensing data user, mostly from Europe. It is incredible to see that after more than 20 years in this domain, I know less than 10% of the audience !There were 10 parallel sessions each […]
=> CESBIO contributes to an international joint laboratory in Morocco, called TREMA, « Télédétection et Ressources en Eau en Méditerranée semi-Aride », which means « Remote Sensing and Water Resources in Semi-Arid Mediterranean ». This year, this laboratory has embarked on an ambitious experiment of irrigation scheduling by satellite imagery, on a wheat plot near Marrakech. This experiment was […]