Thematic Mapper (TM)
The Thematic Mapper (TM) was 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 was a whiskbroom instrument designed and built by SBRC (Santa Barbara Research Centre) of Hughes Aircraft Company in Goleta, USA.
The instrument was 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.
Through the Online Dissemination server, ESA offers registered users access to the following TM data collections:
- Landsat TM ESA archive: Landsat-5 Thematic Mapper high-quality ortho-rectified L1T dataset acquired by ESA stations.
- Landsat 5 TM European and Mediterranean Countries Cloud Free Collection
Further information is available on the Thematic Mapper products information page.
Landsat-5 data can be visualised through the HEDAVI (HEritage DAta Visualisation) service. HEDAVI allows you to discover a wealth of heritage data from ERS and Envisat missions, as well as from Landsat-5 and 7, two important heritage Third Party Missions, through ESA's Long Term Data Preservation programme.
Read more about the processor releases for TM.
Thematic Mapper Cal/Val
The goal of TM calibration and validation activities was to verify the accuracy and quality of data the instrument acquired.
Thematic Mapper Quality Control Reports
Quality Control is monitoring routinely the status of the spacecraft (payload and platform) and to check if the derived products meet the quality requirements along mission life-time.