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Instrument: AVHRR : Advanced Very High Resolution Radiometer
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Related Data Sets
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The AVHRR five channel scanning radiometer with 1.1-km
resolution is sensitive in the visible and near-infrared, and the
infrared 'window' regions. This instrument will be carried
through NOAA-J, NOAA-K, L and M and will have a similar
instrument with six channels and other improvements. AVHRR data
are tape-recorded onboard the spacecraft for readout at the
Fairbanks and Wallops Command Data Acquisition stations. These
data can be recorded in 1.1-km resolution (the basic resolution
of the AVHRR instrument) or at 4 km resolution; the swath width
is >2600 km. The stored high resolution (1.1-km) imagery is known
as Local Area Coverage (LAC). Owing to the large number of data
bits, only about 11+ minutes of LAC can be accommodated on a
single recorder. In contrast, 115 minutes of the lower
resolution (4-km) imagery, called Global Area Coverage (GAC), can
be stored on a recorder, enough to cover an entire 102 minute
orbit of data.

Channel Wavelength Primary Uses
------- ----------- -----------------------------
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

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