Landsat 9’s Thermal Infrared Sensor 2 (TIRS-2) will measure land surface temperature in two thermal infrared bands using the same technology that was used for TIRS on Landsat 8, which uses principles of quantum physics to measure emissions of infrared energy. TIRS-2 will be an improved version of Landsat 8's TIRS, both with regards to instrument class and stray light reduction (see below). However, both the design and specs for TIRS-2 will remain closely aligned with that of TIRS. The TIRS-2 instrument will be a two-band thermal imaging sensor that will provide imagery consistent with Landsat 8 thermal spectral, spatial, radiometric and geometric qualities to enable consistent retrieval of surface temperature. TIRS-2 will provide two spectral bands with a maximum ground sampling distance, both in-track and cross track, of 100 m (328 ft) for both bands. TIRS-2 provides an internal blackbody calibration source as well as space view capabilities.