@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/600b228b-165c-4f80-96e2-7ee2d9989680>
  ns0:altLabel [ ] ;
  skos:definition """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.html


Group: 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: 2008-07-22
End_Group"""@en ;
  skos:prefLabel "AVHRR-2"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/944b7691-af37-4fb4-9393-c114e7997829> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/944b7691-af37-4fb4-9393-c114e7997829>
  skos:prefLabel "Imaging Spectrometers/Radiometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/600b228b-165c-4f80-96e2-7ee2d9989680> .