| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Atmosphere >
Atmospheric Winds >
Wind vector over land surface (horizontal)
  | Measurement Definition*: The wind vector represents the motion of the airmass over the ground. It is described by wind speed and the inverse of wind direction. Conventionally measured at 10 m height.Accuracy is the modulus of the vector difference between measured and true vectors. [Unit ofmeasurement - m/s] |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
AGRI
Advanced Geosynchronous Radiation Imager | Operational
| A multiple channel radiation imager, one of the primary instruments aboard FY-4. Technically featured by a precisely designed two-mirror structure, capable of accurate and flexible sensing in two dimensions, and minute-level fast sector scanning. Frequent Earth imaging over 14 bands with off-axis three reflections of the primary optic system. On-board black body available for IR calibrations at very short time intervals. | n/a | |
VIIRS
Visible/Infrared Imager Radiometer Suite | Operational
| Global observations of land, ocean, and atmosphere parameters: cloud/weather imagery, sea-surface temperature, ocean colour, land surface vegetation indices. | n/a | |
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* Description adapted from WMO.
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