THE CEOS DATABASE : Missions, Instruments and Measurements
Full Name Advanced Topographic Laser Altimeter System Status Operational
Instrument Agencies NASA Maturity
Instrument Type Lidars Geometry Nadir-viewing
Instrument Technology Lidar altimeter Sampling Imaging
Data Access Open Access Data Format ASCII
Measurements and Applications Provide date on ice sheet height and sea ice thickness, land altitude, aerosol height distributions, cloud height and boundary layer height.
Resolution Summary 6 spots 15 m in diameter separated by 1.5 cm along track
[Best Resolution: 0.15m]
Swath Summary
Accuracy Summary Aerosol profile: 20%, Ice elevation: 20 cm, Cloud top height: 75 m, Land elevation: 20 cm, geoid: 5 m
Waveband Summary VIS: Laser emits at 532 nm
VIS (~0.40 µm - ~0.75 µm)
Instrument Measurements
AerosolsAerosol Extinction / Backscatter (column/profile) 
Cloud particle properties and profileCloud optical depth 
Cloud type, amount and cloud top temperatureCloud type 
Ice sheet topographyIce sheet topography 
Landscape topographyLand surface topography 
Sea ice cover, edge and thicknessSea-ice thickness 
VegetationAbove Ground Biomass (AGB) 
Instrument Missions
ICESat-2 - Ice, Cloud, and Land Elevation Satellite 2 (2018 - 2021)
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