THE CEOS DATABASE : Missions, Instruments and Measurements
Full Name Atmospheric Infra-red Sounder Status Operational
Instrument Agencies NASA Maturity
Instrument Type Atmospheric temperature and humidity sounders Geometry Cross-track scanning
Instrument Technology Medium-resolution IR spectrometer Sampling Sounding
Data Access Open Access Data Format HDF-EOS
Measurements and Applications High spectral resolution measurement of temperature and humidity profiles in the atmosphere. Long-wave Earth surface emissivity. Cloud diagnostics. Trace gas profiles. Surface temperatures.
Resolution Summary 1.1 degree (13 x 13 km at nadir)
Swath Summary +/-48.95 degrees
Accuracy Summary Humidity: 20%, Temperature: 1 K
Waveband Summary VIS - TIR: 0.4 - 1.7 µm, 3.4 - 15.4 µm, Has approximately 2382 bands from VIS to TIR
VIS (~0.40 µm - ~0.75 µm)
NIR (~0.75 µm - ~1.3 µm)
MWIR (~3.0 µm - ~6.0 µm)
TIR (~6.0 µm - ~15.0 µm)
Instrument Measurements
Atmospheric Humidity FieldsAtmospheric specific humidity (LT, HT, LS, HS&M, TC) 
Atmospheric Temperature FieldsAtmospheric temperature (LT, HT, LS, HS&M) 
Cloud type, amount and cloud top temperatureCloud cover 
Cloud top height 
Cloud top temperature 
Liquid water and precipitation ratePrecipitation index (daily cumulative) 
OzoneOzone profile 
Radiation budgetShort-wave cloud reflectance 
Downwelling (Incoming) long-wave radiation at the Earth surface 
Short-wave Earth surface bi-directional reflectance 
Upwelling (Outgoing) long-wave radiation at Earth surface 
Long-wave Earth surface emissivity 
Sea ice cover, edge and thicknessSea-ice cover 
Snow cover, edge and depthSnow cover 
Surface temperature (land)Land surface temperature 
Surface temperature (ocean)Sea surface temperature 
Trace gases (excluding ozone)Atmospheric Chemistry - CH4 (TC)1.2 [%]
Atmospheric Chemistry - CO2 (column/profile)1.5 [ppm]
Atmospheric Chemistry - CO (TC) 
Instrument Missions
Aqua - Aqua (formerly EOS PM-1) (2002 - 2020)
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