The GlobAEROSOL generates daily global aerosol maps for the period 1995-2007 by merging ATSR-2, AATSR, MERIS and SEVIRI satellite data. The products produced are aerosol optical depths at 0.55 and 0.87um and Angstrom coefficient and estimated speciation.
This dataset comprises the following product types:
ATSR-2 Orbit-based Pixel Counts. These are supplementary files generated for ATSR-2 alone, which contain the number of instrument pixels from each channel which were included in each retrieval grid cell. Individual-sensor Orbit-based Aerosol Products (IOAP). These files contain all the output of the individual sensor retrievals, with coverage corresponding to that of the original level 1 (radiance) data from the sensor.
Individual-sensor Global Aerosol Products (IGAP). These constitute bias-corrected daily maps of aerosol properties derived from each sensor, at a specific time of day. For ORAC retrievals results are only reported for the "best" aerosol type (and this type is identified). In all cases the IGAPs contain estimates of aerosol optical depth (AOD) at 550 nm and 865 nm and the Angstrom coefficient...
The Ionia website provides access to a number of Earth Observation Level 3 and Level 4 products generated by ESA projects, using a variety of instruments, including non-ESA satellite data.
These products have been generated mostly as a result of projects run through the ESA Data User Programme (DUP) and Data User Element (DUE). In addition, some products were generated through ESA internal projects. This is the case in particular of the ATSR fire atlas products.
Global, coarse-resolution soil moisture data (25-50 km) are derived from backscatter measurements acquired with scatterometers onboard the satellites ERS-1 and ERS-2 (1991 to present) and the three MetOp satellites (2006-2020). Two different product types are derived:
* Level 2 products representing the soil moisture content within a thin soil surface layer (< 2 cm) during the time of overflight of the satellite.
* Level 3 products representing the water content in the soil profile, regularly sampled in space and time.
The Level 2 surface soil moisture (SSM) data are derived using a change detection method that relies upon the multi-incidence observation capabilities of the ERS and METOP scatterometers to model the effects of vegetation phenology. The surface soil moisture values are scaled between 0 and 1, representing zero soil moisture and saturation respectively. Retrieval is not possible over tropical forest which affects about 6.5% of the land surface area.