Sensors and Their SpecificationsThematic Mapper (TM)       A Thematic Mapper (TM) is one of the Earth observing sensors in...
Sensors and Their SpecificationsEnhanced Thematic Mapper (ETM+)       ETM+ is similar to TM, but has a higher spatial reso...
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Thematic mapper

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Thematic mapper

  1. 1. Sensors and Their SpecificationsThematic Mapper (TM) A Thematic Mapper (TM) is one of the Earth observing sensors introduced in the Landsat program. The first was placed aboard Landsat 4 (decommissioned in 2001), and another was operational aboard Landsat 5 up to 2012. TM sensors feature seven bands of image data (three in visible wavelengths, four in infrared) most of which have 30 meter spatial resolution. TM is a whisk broom scanner which takes multi-spectral images across its ground track. It does not directly produce a thematic map. The Thematic Mapper has become a useful tool in the study of albedo and its relationship to global warming and climate change.Band Specification Band Wavelength Resolution Swath Revisit time (µm) (m) Width (days) (km) Band 1 (Blue) 0.45 to 0.52 30 185 16 Band 2 (Gr) 0.52 to 0.6 30 185 16 Band 3 (Red) 0.63 to 0.69 30 185 16 Band 4 (NIR) 0.76 to 0.9 30 185 16 Band 5 (SWIR) 1.55 to 1.75 30 185 16 Band 6 (TIR) 10.4 to 12.5 120 185 16 Band 7 2.08 to 2.35 30 185 16 (SWIR)S K Diwakar
  2. 2. Sensors and Their SpecificationsEnhanced Thematic Mapper (ETM+) ETM+ is similar to TM, but has a higher spatial resolution thermal channel and includes a new panchromatic channel. These satellites have a polar, circular, sun-synchronous 705-km orbit with a 16-day repeat cycle. The TM swath width is 185 km.Band Specification Band Wavelength Region (µm) Resolution (m) 1 0.450-0.515 (blue) 30 2 0.525-0.605 (green) 30 3 0.630-0.690 (red) 30 4 0.750-0.900 (near-IR) 30 5 1.55-1.75 (mid-IR) 30 6 10.4-12.5 (thermal-IR) 60 7 2.08-2.35 (mid-IR) 30 PAN 0.52-0.90 15S K Diwakar

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