| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Ocean >
Ocean wave height and spectrum >
Wave directional energy frequency spectrum
  | Measurement Definition*: 2-D parameter colloquially referred to as “wave spectrum”. Describes the wave energy travelling in each direction and frequency band (e.g., 24 distinct azimuth sectors each 15° wide, and 25 frequency bands) - Physical unit: [ m2×Hz-1×rad-1 ] - Accuracy unit: [ m2×Hz-1×rad-1 ]. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
SWIM
Surface Waves Investigation and Monitoring | Operational
| Ku-band Real-aperture radar (RAR) system, multi-incindence beams(0-10°) and azimuth scanning. Measurement of 2D ocean waves spectrum | n/a |  |
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* Description adapted from WMO.
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