| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Land >
Multi-purpose imagery (land) >
Surface Coherent Change Detection
  | Measurement Definition*: Techniques that exploit the changes between two or several radar images of the same scene, in conditions where there is measurable coherence between at least a fraction of a pair of images, to detect subtle differences in the surface condition that can be related to sub-wavelength motions, surface properties changes or sub-pixel disturbances. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
SAR (RADARSAT-2)
Synthetic Aperture Radar (SAR) C band | Operational
| All-weather images of ocean, ice and land surfaces. Used for monitoring of coastal zones, polar ice, sea ice, sea state, geological features, vegetation and land surface processes. | n/a |  |
SAR (RCM)
Synthetic Aperture Radar (SAR) C band | Operational
| All-weather, C-band data to support ecosystem monitoring, maritime surveillance and disaster management. | n/a | |
SAR-L
L-Band Synthetic Aperture Radar | Operational
| Land, ocean, emergencies, soil moisture, interferometry, others. | n/a | |
L-band SAR (NISAR)
L-band Synthetic Aperture Radar (SAR) (NISAR) | Approved
| 3-year mission to study solid earth deformation (earthquakes, volcanoes, landslides), changes in ice (glaciers, sea ice) and changes in vegetation biomass | n/a | |
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* Description adapted from WMO.
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