Advanced Very High Resolution Radiometer - 3
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A radiation-detection imager with six spectral bands, designed to provide global data collection from the visible, near-infrared and thermal infrared portions of the electromagnetic spectrum at a high temporal resolution. Derived parameters include Sea Surface Temperatures (SST), Normalised Difference Vegetation Index (NDVI), atmospheric aerosols and volcanic ash, snow and ice distribution, cloud patterns and land-water boundaries. A flat scanning mirror undergoes a continuous 360 degrees rotation at six scans per second around an axis parallel to the Earth's surface, thus scanning a field of view perpendicular to the satellite orbit track and at such speed that adjacent scan lines are contiguous at nadir position. The AVHRR instrument has an angular resolution of 1.3 mrad and a spatial resolution of 1.1 km at nadir. The swath width is 2900 km and the scan angle is 55.4 degrees from nadir. The scanning radiometer uses six detectors to collect different bands of radiation wavelengths: (0.58 - 0.68) um, (0.725 - 1.00) um, (1.58 - 1.64) um, (3.55 - 3.93) um, (10.30 - 11.30) um, (11.50 - 12.50) um. The instrument does not carry an on-board calibration system. The first AVHRR was deployed in 1978, and only had four channels. AVHRR/2 was an improved version comprising five channels, and first deployed in 1981. AVHRR/3 is the latest version advanced to six channels, and first deployed in 1998. Flown on Metop-A, Metop-B, Metop-C, NOAA-15, NOAA-16, NOAA-17, NOAA-18, NOAA-19. http://www.wmo-sat.info/oscar/instruments/view/62|
|Has Current Version||1|
|L05 SeaDataNet device categories - (3)|
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