| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Land >
Surface temperature (land) >
Evapotranspiration
  | Measurement Definition*: The vaporisation of water through direct evaporation from wet surfaces plus the release of water vapour by plants through leaf pores. In remote sensing, evapotranspiration can be estimated using land surface temperature measurements. |
| 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 |  |
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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