=> The SPOT4 (Take5) experiment begins its last 5 days cycle tomorrow (15th of June). The last images will be captured on June the 19th : we wish a nice weather for all the sites ! On June 19th, the acquisition phase of SPOT4 (Take5) will end, but the application phase will start soon. SPOT4 […]
=> The snow season is ending in the high Atlas mountains in Morocco this beginning of June, as you may see in this time series from SPOT-4 (Take5) experiment over the Rheraya watershed (225 km²). This watershed is one of the study sites of the Laboratoire Mixte International TREMA which CESBIO is co-leading. The Rheraya […]
Les données de LANDSAT 8 sont disponibles sur http://earthexplorer.usgs.gov/ LANDSAT 8 data are available on http://earthexplorer.usgs.gov/
=> USGS and NASA just released a new LANDSAT level 2A product (surface reflectances corrected for atmospheric effects with a cloud mask, a cloud shadow mask, and a water and snow mask). The thermal data are expressed as brightness temperatures at the top of atmosphere. This product is only available for Landsat 5 and Landsat […]
=> CNES and Astrium Geo (Spotimage) have agreed to distribute the SPOT4 (Take5) data with a very open license, which was just released. As always with the elaboration of legal agreements, the process was rather long and complicated, but here, the result is very positive. If I understand correctly (you’d better read the document, which is […]
=> Caution ! This post contains formulas ! Aerosols play a great role in the atmospheric effects. Aerosols are particles suspended in the atmosphere, which can be of several types: sand or dust, soot from combustion, sulfates or sea salt, surrounded by water… Their size ranges between 0.1 micron and a few microns, depending on […]
=> The SPOT4 (Take5) is already 3 months old and will only last for one month and a half. For the in-situ measurements among the users teams, there is also only one month left. On that occasion, we just created a quicklook page that shows all the images acquired between January the 31st and […]
=> When Mireille Huc steps in my office saying « il y a un problème » (there is an issue), it is generally due to a new case that is not handled by our level 2A methods. This time, she said : « there is an issue with Paris ». Such issues happen regularly each time we observe […]
=> I have written that SPOT4 (Take 5) was working as a clockwork, but I have to admit that the ortho-rectification of SPOT4 images is not as easy as I thought initially. The location error of an image is the average difference between the actual position of the pixels of an image, and the position […]