AVHRR (European )
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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.
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Example result / latest result (if near-real time)
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| 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 |
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Algorithm description
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Product format description
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Version explanation
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Validation summary
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Product data access
Image / quicklook data access |