| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Atmosphere >
Cloud particle properties and profile >
Cloud drop effective radius
  | Measurement Definition*: Size distribution of liquid water drops, assimilated to spheres of the same volume. Considered as both a 3D field throughout the troposphere and a 2D field at the top of the cloud surface - Measuring Units μm, Uncertainty Units μm
Thematic Links |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
ABI
Advanced Baseline Imager | Operational
| Detects clouds, cloud properties, water vapour, land and sea surface temperatures, dust, aerosols, volcanic ash, fires, total ozone, snow and ice cover, vegetation index. | n/a | |
AMI
Advanced Meteorological Imager | Operational
| Continuous monitoring capability for the near real-time generation of high-resolution meteorological products and long-term change analysis of land/sea surface temperature and cloud coverage. | n/a | |
MODIS
MODerate-Resolution Imaging Spectroradiometer | Operational
| Data on biological and physical processes on the surface of the Earth and in the lower atmosphere, and on global dynamics. Surface temperatures of land and ocean, chlorophyll fluorescence, land cover measurements, cloud cover (day and night). | n/a | |
FCI
Flexible Combined Imager | Being developed
| Measurements of cloud cover, cloud top height, precipitation, cloud motion, vegetation, radiation fluxes, convection, air mass analysis, cirrus cloud discrimination, tropopause monitoring, stability monitoring, total ozone and sea surface temperature. | n/a | |
GEOXO Imager
GEO Extended Operations Imager | Being developed
| Detects clouds, cloud properties, water vapour, land and sea surface temperatures, dust, aerosols, volcanic ash, fires, total ozone, snow and ice cover, vegetation index. | n/a | |
METimage
Multi Spectral Imager | Being developed
| Operational multi spectral imager for meteorological EPS-SG VIS/IR Imaging Mission (VII): imagery data for global and regional NWP, NWC, and climate monitoring with information on LST, SST, clouds coverage and micro-physics, land surfaces (vegetation, snow/ice, fire), aerosol and atmospheric motion vectors. Provides collocated cloud mask & characterisation as well as intra-pixel heterogeneity to other EPS-SG missions (with larger footprint). | n/a | |
Fourier Transform Spectrometer
Fourier Transform Spectrometer | Approved
| Measure across Earth’s entire far-infrared part of the electromagnetic spectrum | n/a | |
MSI (EarthCARE)
Multi-Spectral Imager (EarthCARE) | Approved
| Observation of cloud properties and aerosol (aerosols to be confirmed). | n/a | |
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* Description adapted from WMO.
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