| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Ocean >
Ocean wave height and spectrum >
Dominant wave period
  | Measurement Definition*: One feature of the ocean wave spectrum. It is the period of the most energetic wave in the spectrum - Physical unit: [ s ] - Accuracy unit: [ s ]. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
C-Band SAR
C-Band Synthetic Aperture Radar | Operational
| Marine core services, land monitoring and emergency services. Monitoring sea ice zones and arctic environment. Surveillance of marine environment, monitoring land surface motion risks, mapping of land surfaces (forest, water and soil, agriculture), mapping in support of humanitarian aid in crisis situations. | Imaging radar (SAR) |  |
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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