THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - ILAS-II -
Full Name Improved Limb Atmospheric Spectrometer-II Status No longer operational
Instrument Agencies MOE (Japan), JAXA Maturity
Instrument Type Atmospheric chemistry Geometry Occultation
Instrument Technology Limb-scanning IR spectrometer Sampling Sounding
Data Access Data Format
Measurements and Applications Measures minor trace gas species at high latitudes, in the altitude range 10 - 60 km (O3, CH4, NO2, N2O, H2O, CFC11, HNO3, CIONO2, N2O5, aerosols, temparature, pressure).
Resolution Summary Vertical: 1 km Temparature, aerosols, pressure: 2 km (horiz), CIONO2: 21.7 km (horiz), Others: 13 km (horiz)
Swath Summary
Accuracy Summary Temperature: 0.2 K, Pressure: 1%, Aerosol: 2%, Ozone: 3 - 5%, Other trace gases: 2 - 25%
Waveband Summary VIS: 0.753 - 0.784 µm, MWIR - TIR: 3.0 - 5.7 µm, 6.21 - 11.76 µm, 12.78 - 12.85 µm
NIR (~0.75 µm - ~1.3 µm)
MWIR (~3.0 µm - ~6.0 µm)
TIR (~6.0 µm - ~15.0 µm)
Instrument Measurements
CategoryParameterAccuracy
AerosolsAerosol Extinction / Backscatter (column/profile) 
Aerosol absorption optical depth (column/profile) 
Atmospheric Humidity FieldsAtmospheric specific humidity (HT, LS, HS&M) 
Atmospheric Temperature FieldsAtmospheric temperature (HT, LS, HS&M) 
OzoneOzone profile 
Trace gases (excluding ozone)Atmospheric Chemistry - CH4 (HT, LS, HS&M) 
Atmospheric Chemistry - CFC-11 (HT, LS, HS&M) 
Atmospheric Chemistry - CFC-12 (HT, LS, HS&M) 
Atmospheric Chemistry - NO2 (HT, LS, HS&M) 
Atmospheric Chemistry - N2O (HT, LS, HS&M) 
Atmospheric Chemistry - HNO3 (HT, LS, HS&M) 
Atmospheric Chemistry - ClONO2 (HT, LS, HS&M) 
Instrument Missions
ADEOS-II - Advanced Earth Observing Satellite - II (2002 - 2003)
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