The Thematic Mapper (TM) is a multispectral scanning radiometer operating in the visible and Infra-Red regions of the Electromagnetic Spectrum that was carried on board the Landsat 4 and 5 satellites.
TM is a whiskbroom instrument designed and built by SBRC (Santa Barbara Research Centre) of Hughes Aircraft Company in Goleta, CA. TM is regarded as a second generation imager for monitoring Earth's resources with considerably improved spectral and spatial resolutions over those of the Multi Spectral Scanner which was used aboard the Landsat 1 to 5 satellites. The TM sensors provided nearly continuous coverage from July 1982 to June 2013.
|Swath Width||185 km|
|Resolution||30 m for VIS, NIR, SWIR
120 m for TIR, no onboard recording
|Band No.||Bandwidth (µm)||Detectors|
|1||0.45-0.52 (VIS, blue)||Coastal water mapping, soil/vegetation differentiation, deciduous/coniferous differentiation, chlorophyll absorption|
|2||0.52-0.60 (VIS, green)||Green reflectance, peak of healthy vegetation, plant vigor|
|3||0.63-0.69 (VIS, red)||Chlorophyll absorption, plant type discrimination|
|4||0.76-0.90 (NIR)||Biomass surveys, water body delineation|
|5||1.55-1.75 (SWIR)||Vegetation moisture measurement, snow/cloud differentiation|
|7||2.08-2.35 (SWIR)||Hydrothermal mapping, geology|
|6||10.4-12.5 (TIR)||Plant heat stress, thermal mapping, soil mapping|
Landsat operated in the SAM (Scan Angle Monitor) Mode for nominal routine operations. On 1 March 2002, Landsat 5 TM was switched to the 'backup' BUMPER mode to help correct issues associated with the end of an instruments lifetime. More information on this mode-switch is available in the Monthly update from April 2002.