Sea surface temperature (SST)
Every day since February 1993, DFD is generating from different NOAA-AVHRR sensors (starting with NOAA-11) daily sea surface temperature products for the Mediterranean, the North Sea and the Atlantic region around Madeira. Currently, three daytime and three nighttime NOAA-17 scenes are used. Simultaneous measurements in two thermal infrared spectral ranges make it possible to correct for atmospheric influences. The scenes have a radiometric resolution of 0.125 ° C and a geometric resoluton of about 1.1 km in the center of the map; Mercator projection is used. Weekly and monthly thematic synthesis products are derived from this daily operational product, at each step becoming successively free of clouds.
Land surface temperature (LST)
The determination of land surface temperature from satellite data is more complex because of the different spectral response of different kinds of land cover. This unique presentation of land surface temperatures can be used for many applications in the geosciences, whether for scientific studies or as an aid in making practical decisions related to climate or geography. Examples are determining the agricultural suitability of particular regions, or monitoring the moderating influence of vegetation on temperature. This unique presentation of land surface temperatures can be used for many applications in the geosciences, whether for scientific studies or as an aid in making practical decisions related to climate or geography. Examples are determining the agricultural suitability of particular regions, or monitoring the moderating influence of vegetation on temperature.
Normalized differential vegetation index (NDVI) for Europe
Every day, three successive NOAA-17 scenes are used to derived a synthesis product in stereographic projection known as the "Normalized Difference Vegetation Index" for Europe and North Africa. It is calculated by dividing the difference in technical albedos between measurements in the near infrared and visible red part of the spectrum by the sum of both measurements. This value provides important information about the "greenness" and density of vegetation. Weekly and monthly thematic synthesis products are derived from this daily operational product, at each step becoming successively free of clouds.
All these products are available through EOWEB.
Global Ozone data
The Global Ozone Monitoring Experiment-2 (GOME-2) is one of the new-generation European instruments carried on MetOp-A (launched in October 2006). It continues the long-term monitoring of atmospheric trace gases started by GOME on ERS-2 and SCIAMACHY on Envisat. GOME-2 maps concentrations of atmospheric ozone, nitrogen dioxide, sulphur dioxide and further trace gases. Furthermore cloud properties and intensities of ultraviolet radiation are retrieved. These data are crucial for monitoring the atmospheric composition and the detection of pollutants.