| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Snow and Ice >
Snow cover, edge and depth >
Snow Grain Size
  | Measurement Definition*: Grain size of snow ice particle - Physical unit: [ mm] - Accuracy unit: [ % ]. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
SGLI
Second-generation Global Imager | Operational
+/-50 % | Medium resolution multi-spectral imaging of land, ocean and atmosphere. SGLI-VNR is an optical sensor capable of multi-channel nadir observation at wavelengths from near-UV to NIR and forward or backward polarization observation at red and near infrared wavelengths (Push-broom scanning). SGLI-IRS is an optical sensor capable of multi-channel nadir observation at wavelengths from SWIR to TIR wavelengths (Cross-track scanning). | n/a |  |
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* Description adapted from WMO.
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