https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.8 2026-04-29T10:52:37.449Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/e64e83bd-02b3-4a47-830d-00e1aa4b04d3 AVHRR The AVHRR five channel scanning radiometer with 1.1-kmresolution is sensitive in the visible and near-infrared, and theinfrared 'window' regions. This instrument will be carriedthrough NOAA-J, NOAA-K, L and M and will have a similarinstrument with six channels and other improvements. AVHRR dataare tape-recorded onboard the spacecraft for readout at theFairbanks and Wallops Command Data Acquisition stations. Thesedata can be recorded in 1.1-km resolution (the basic resolutionof the AVHRR instrument) or at 4 km resolution; the swath widthis >2600 km. The stored high resolution (1.1-km) imagery is knownas Local Area Coverage (LAC). Owing to the large number of databits, only about 11+ minutes of LAC can be accommodated on asingle recorder. In contrast, 115 minutes of the lowerresolution (4-km) imagery, called Global Area Coverage (GAC), canbe stored on a recorder, enough to cover an entire 102 minuteorbit of data.Channel Wavelength Primary Uses (microns)------- ----------- ----------------------------- 1 0.58- 0.68 Daytime cloud/surface mapping 2 0.725- 1.10 Surface water delineation, ice and snow melt 3 3.55- 3.93 Sea surface temperature, nighttime cloud mapping 4 10.30-11.30 Sea surface temperature, day and night cloud mapping 5 11.50-12.50 Sea surface temperature, day and night cloud mapping------------------------------------------------------Additional information available at:http://noaasis.noaa.gov/NOAASIS/ml/avhrr.html