The Landsat Thermal Infra-Red Scanner (TIRS) provides two more narrow spectral bands in the Thermal (originally covered by a single band in the previous TM and ETM+ sensors) and is a QWIP (Quantum Well Infra-Red Photodetector) based instrument intended to supplement the observations of the OLI instrument.
The Thermal Infra-Red Scanner (TIRS) instrument on board Landsat 8 is a thermal imager operating in pushbroom mode with two Infra-Red channels: 10.8 µm and 12 µm. The two spectral bands are achieved through interference filters that cover the FPA (Focal Plane Assembly). The pushbroom implementation increases the system sensitivity by allowing longer integration times than whiskbroom sensors. The two channels allow the use of the "split-window" technique to aid in distinguishing between the temperature of the Earth's surface and that of the atmosphere.
|Swath Width||185 km|
|Spatial Resolution (GSD)||100 m|
|Scene Size||185x180 km|
|Bandwidths||10.3-11.3 µm (10.8 band centre) and 11.5-12.5 µm (12.0 band centre)|
Find out more about TIRS on the NASA website