AVHRR (European )

AOD is retrieved from NOAA AVHRR with special focus on Central Europe and the European Alps. In contrast to classical methods, no a priori knowledge of the surface reflectance is necessary but instead the surface reflectance is estimated from a time series including the previous 44 days. Additionally, the area where aerosol optical depth can be retrieved is no longer limited to certain land cover types. Only bright surface targets are excluded in the retrieval.

Example result / latest result (if near-real time)


Satellite: NOAA (NOAA)
Instrument(s): AVHRR
Instrument/algorithm PI: Michael Riffler, University of Bern
Contact details: riffler[at]giub.unibe.ch, swun[at]giub.unibe.ch
Parameter(s): AOD
Aerosol algorithm: AVHRR AOD land
Cloud screening: CASPR
Aerosol model: Sun photometer derived (6S, single type, seasonal variability)
Retrieval assumptions: invariant surface reflectance during 45 days; very bright surfaces are rejected; correction for water vapour, ozone, Rayleigh optical depth
Retrieval limitations: slightly increasing difference between estimated and modelled surface with increasing surface reflectance
Spatial, temporal coverage: NRT, Alps and adjacent regions, 40.5°N-50°N, 0°W-17°E
Scientific dataset, Central Europe (35°N-55°N, 5°W-25°E),
(1985-) 1989 - 2009
Spatial, temporal resolution: 1.1x1.1km² / 2048km swath width / 1-2 overpasses per day
Operations status: operational
Validation status: intercomparison with ground-based and other satellite observations
Quality control: manual / offline AERONET validation
last algorithm version: AVHRR AOD LAND/V2 (11/2009)
last validation: 10/2009



Algorithm description
Product format description
Version explanation
Validation summary


Product data access
Image / quicklook data access