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/87c44e15-54c8-407d-a881-8035a2d5512b AVHRR-3 Date=2019-02-22 User Id=mmorahan Entity=Resource Operation=UPDATE Field=type System Note=update Resource Old Value=IMAGE New Value=image Date=2019-02-22 User Id=mmorahan Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 6120cea0-c943-4c7c-bddd-8d8648d58022 relationship type: null relationship value: null generated by: null Date=2020-05-14 User Id=mmorahan Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 6a426480-c58f-4b6b-8e35-0975b7f6edb5 relationship type: null relationship value: null generated by: null Date=2020-05-14 User Id=mmorahan Entity=WeightedRelation Operation=DELETE System Note=delete WeightedRelation Old Value=id: null related concept uuid: 6a426480-c58f-4b6b-8e35-0975b7f6edb5 relationship type: null relationship value: null generated by: null [ Text Source, ESA Meteorological Missions Homepage, http://www.esa.int/esaLP/SEM9VEG23IE_LPmetop_0.html ]The Advanced Very High Resolution Radiometer (AVHRR/3) is one of the complement of American instruments provided by the National Oceanic and Atmospheric Administration (NOAA) to fly on MetOp-A, B and C.The AVHRR/3 scans the Earth surface in six spectral bands in the range of 0.58 - 12.5 microns. It provides day and night imaging of land, water and clouds, measures sea surface temperature, ice, snow and vegetation cover.The AVHRR/3 is a six-channel imaging radiometer that detects energy in the visible and infrared (IR) portions of the electromagnetic spectrum. The instrument measures reflected solar (visible and near-IR) energy and radiated thermal energy from land, sea, clouds, and the intervening atmosphere. The instrument has an instantaneous field-of-view (IFOV) of 1.3 milliradians providing a nominal spatial resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating elliptical scan mirror provides the cross-track scan, scanning the Earth from ± 55.4° from nadir. The mirror scans at six revolutions per second to provide continuous coverage.The instrument provides spectral and gain improvements to the solar visible channels that provide low light energy detection. Channel 3A, at 1.6 microns, provides snow, ice, and cloud discrimination. Channel 3A will be time-shared with the 3.7-micron channel, designated 3B, to provide five channels of continuous data. An external sun shield and an internal baffle have been added to reduce sunlight impingement into the instrument’s optical cavity and detectors. Group: Instrument_Details Entry_ID: AVHRR-3 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-3 Long_Name: Advanced Very High Resolution Radiometer-3 End_Group Group: Associated_Platforms Short_Name: METOP Short_Name: METOP-A Short_Name: METOP-B Short_Name: NOAA-19 Short_Name: NOAA-18 Short_Name: NOAA-17 Short_Name: NOAA-16 Short_Name: NOAA-15 End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Near Infrared Number_Channels: 3 Spectral_Frequency_Coverage_Range: 0.58 μm - 1.64 μm Spectral_Frequency_Resolution: 1.09 km End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Infrared > Thermal Number_Channels: 3 Spectral_Frequency_Coverage_Range: 3.55 μm - 12.5 μm Spectral_Frequency_Resolution: 1.09 km End_Group Online_Resource: http://www2.ncdc.noaa.gov/docs/klm/html/c3/sec3-1.htm Online_Resource: http://www.esa.int/esaLP/SEM9VEG23IE_LPmetop_0.html Online_Resource: http://www.eumetsat.int/Home/Main/Satellites/Metop/Instruments/SP_2010053153142514 Online_Resource: http://database.eohandbook.com/database/instrumentsummary.aspx?instrumentID=403 Sample_Image: http://goespoes.gsfc.nasa.gov/poes/instruments/images/enlarged_avhhr.jpg Creation_Date: 2008-07-22 Group: Instrument_Logistics Instrument_Owner: USA/NOAA Instrument_Owner: USA/NASA End_GroupEnd_Group 2020-05-14 04:56:54.0