Thermal, longwave infrared (LWIR) spectral imagery can be used to fullest advantage only when the effects of the atmosphere have been removed and the data are output in units of emissivity or reflectance of materials in the scene. SSI’s FLAASH®-IR software performs accurate atmospheric correction and temperature-emissivity separation of material properties in the LWIR hyperspectral imagery (HSI) of the ground or outdoor objects.