https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/600b228b-165c-4f80-96e2-7ee2d9989680 AVHRR-2 The Advanced Very High Resolution Radiometer (AVHRR) is a multi purpose imaging instrument used for global measurement of cloud cover, sea surface temperature, ice, snow and vegetation cover and characteristics. This instrument is currently flying on the NOAA series of spacecraft in a five channel version, on board NOAA-7, NOAA-9, NOAA-11and NOAA-13 and NOAA-14. The five AVHRR channels are located in the visible and infra red between 0.63 and 12.0 micrometers, with an instantaneous footprint of 1.1 km at the sub satellite point. The internal rotating scan mirror also views deep space and a thermal calibration source on each rotation. Scanning is cross-track with a range of ±55.37° about nadir.Calibration of the IR channels is performed with 4 internal black bodies every scan line. The calibration coefficients for the visible channels are determined pre launch.AVHRR scans across track of the satellite path in continuous scan. There are 2048 Earth Views per scan over a swath of ± 1447 km. The squared instantaneous field of view has a size of 1.1 km at nadir.Information obtained from http://www.metoffice.gov.uk/research/interproj/nwpsaf/aapp/avhrr_2.html and http://eoweb.dlr.de:8080/short_guide/D-AVHRR.htmlGroup: Instrument_Details Entry_ID: AVHRR-2 Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: AVHRR-2 Long_Name: Advanced Very High Resolution Radiometer-2 End_Group Group: Associated_Platforms Short_Name: NOAA-14 Short_Name: NOAA-13 Short_Name: NOAA-11 End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Near Infrared Number_Channels: 5 Spectral_Frequency_Coverage_Range: 0.63 and 12.0 µm End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible Number_Channels: 5 Spectral_Frequency_Coverage_Range: 0.63 and 12.0 µm End_Group Online_Resource: http://eoweb.dlr.de:8080/short_guide/D-AVHRR.html Online_Resource: http://www.metoffice.gov.uk/research/interproj/nwpsaf/aapp/avhrr_2.html Creation_Date: 2008-07-22End_Group