THE CEOS DATABASE : Missions, Instruments and Measurements
Full Name Cloud radar (ACE) Status Proposed
Instrument Agencies NASA Maturity Medium Heritage
Instrument Type Cloud profile and rain radars Geometry Nadir-viewing
Instrument Technology Cloud and precipitation radar Sampling Imaging
Data Access Open Access Data Format HDF
Measurements and Applications Radar measurement for cloud droplets and precipitation.
Resolution Summary Vertical: 250 m, Cross-track: 1.4 km, Along-track: 2.5 km
Swath Summary Instantaneous Footprint < 1 km
Accuracy Summary TBD
Waveband Summary Dual frequency: 35 and 94 GHz
MW (~1.0 cm - ~100 cm)
Instrument Measurements
Atmospheric Temperature FieldsCloud base height 
Atmospheric pressure (over sea surface) 
Cloud particle properties and profileCloud liquid water (column/profile) 
Precipitation Profile (liquid or solid) 
Cloud ice (column/profile) 
Cloud ice content (at cloud top) 
Cloud optical depth 
Cloud type, amount and cloud top temperatureCloud imagery 
Cloud type 
Cloud cover 
Liquid water and precipitation ratePrecipitation rate (liquid) at the surface 
Precipitation rate (solid) at the surface 
Radiation budgetDownwelling (Incoming) long-wave radiation at the Earth surface 
Instrument Missions
ACE - Aerosol Clouds and Ecosystem Mission (2022 - 2023)
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