Advanced Along-Track Scanning Radiometer
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A passive optical imager with dual view composed of a 7-channel infra-red radiometer, designed to measure sea surface temperature, cloud attributes, as well as vegetation and sea-ice cover. The infra-red radiometer uses an along-track scanning telescope to focus incoming radiation from two views at different angles: one at nadir and one fore-looking at approximately 47 degrees. The same point on the Earth's surface is thus observed twice through differing atmospheric thickness, allowing for direct estimation of the atmospheric absorption and scattering, which can be used for atmospheric correction of the surface dataset. The instrument carries an on-board visible calibration system. The AATSR is functionally identical to ATSR-2, but its structure is adapted to the Envisat platform. Moreover, AATSR has a larger telemetry bandwidth compared to ATSR-2, allowing it to collect and telemeter a greater amount of visible data. The instrument's bandwidths are: (0.53 - 0.57)um, (0.64 - 0.68)um, (0.85 - 0.89)um, (1.31 - 1.91)um, (3.55 - 3.85)um, (10.35 - 11.35)um, (11.50 - 12.50)um. The instrument's resolution is 1 km at the instantaneous field of view (IFOV). The swath is 500 km. The accuracy of sea surface temperature measurements is approximately 0.1 degC. Flown on Envisat. http://www.wmo-sat.info/oscar/instruments/view/2|
|Has Current Version||1|
|L05 SeaDataNet device categories - (3)|
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