Measurements > Land >
Inland Waters >
Surface Water Extent
  | Measurement Definition*: The spatial extent of water on the surface of the Earth such as in a river, lake, ponds, wetland, or the ocean, as well as inundation due to flooding. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
ETM+
Enhanced Thematic Mapper Plus | Operational
| Measures surface radiance and emittance, land cover state, and change (e.g., vegetation type). Used as multi-purpose imagery for land applications. | n/a |  |
OLI
Operational Land Imager | Operational
| Measures surface radiance, land cover state, and change (e.g., vegetation type). Used as multi-purpose imagery for land applications. | n/a | |
OLI-2
Operational Land Imager 2 | Operational
| Measures surface radiance, land cover state, and change (e.g., vegetation type). Used as multi-purpose imagery for land applications. | n/a | |
TIRS
Thermal Infrared Sensor | Operational
| Measures longwave thermal infrared surface emittance, land cover state, and change. Used as multipurpose imagery for land applications. | n/a | |
TIRS-2
Thermal Infrared Sensor 2 | Operational
| Measures longwave thermal infrared surface emittance, land cover state, and change. Used as multipurpose imagery for land applications. TIRS-2 will adhere to the Landsat 8 TIRS instrument performance specifications but will be built to NASA Class-B instrument standards (including a 5-year design life). | n/a | |
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* Description adapted from WMO.
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