THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - HIRS/4 -
Full Name High Resolution Infra-red Sounder/4 Status Operational
Instrument Agencies EUMETSAT, NOAA Maturity High Heritage - Operational
Instrument Type Atmospheric temperature and humidity sounders Geometry Cross-track scanning
Instrument Technology Narrow-band channel IR radiometer Sampling Imaging
Data Access Data Format
Measurements and Applications Atmospheric temperature profiles and data on cloud parameters, humidity soundings, water vapour, total ozone content, and surface temperatures. Same as HIRS/3, with 10 km IFOV.
Resolution Summary 20.3 km
Swath Summary 2240 km
Accuracy Summary
Waveband Summary VIS - TIR: 0.69 - 14.95 µm (20 channels)
VIS (~0.40 µm - ~0.75 µm)
NIR (~0.75 µm - ~1.3 µm)
SWIR (~1.3 µm - ~3.0 µm)
MWIR (~3.0 µm - ~6.0 µm)
TIR (~6.0 µm - ~15.0 µm)
Instrument Measurements
CategoryParameterAccuracy
Atmospheric Humidity FieldsAtmospheric specific humidity (LT, HT, TC) 
Atmospheric Temperature FieldsAtmospheric temperature (LT, HT, LS, TC) 
Cloud type, amount and cloud top temperatureCloud top height 
Cloud top temperature 
OzoneOzone profile 
Radiation budgetUpwelling (Outgoing) long-wave radiation at TOA 
Surface temperature (land)Land surface temperature 
Surface temperature (ocean)Sea surface temperature 
Trace gases (excluding ozone)Atmospheric Chemistry - CO2 (TC)4 [ppm]
Instrument Missions
NOAA-18 - National Oceanic and Atmospheric Administration - 18 (2005 - 2016)
Metop-A - Meteorological Operational Polar Satellite - A (2006 - 2019)
NOAA-19 - National Oceanic and Atmospheric Administration - 19 (2009 - 2016)
Metop-B - Meteorological Operational Polar Satellite - B (2012 - 2024)
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