THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - ILAS -
Full Name Improved Limb Atmospheric Spectrometer 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 700 m
[Best Resolution: 700m]
Swath Summary 1400km
Accuracy Summary
Waveband Summary NIR (~0.75 µm - ~1.3 µm)
NIR (~0.75 µm - ~1.3 µm)
TIR (~6.0 µm - ~15.0 µm)
Instrument Measurements
CategoryParameterAccuracy
AerosolsAerosol Extinction / Backscatter (column/profile) 
Aerosol absorption optical depth (column/profile) 
OzoneOzone profile 
Trace gases (excluding ozone)Atmospheric Chemistry - CH4 (HS&M) 
Atmospheric Chemistry - CFC-11 (HS&M) 
Atmospheric Chemistry - N2O (HS&M) 
Atmospheric Chemistry - HNO3 (HS&M) 
Instrument Missions
ADEOS - Advanced Earth Observing Satellite (1996 - 1997)
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