BAND INFORMATION CHARACTERISTICS
The tremendous amount of land cover mapping has been conducted over the last three decades using Landsat MSS, Landsat TM, and Landsat ETM+ imagery. Landsats 4 and 5 launched in 1982 and 1984 had Thematic Mapper sensors that recorded energy in six bands in the visible through mid-infrared at 30 X 30 m (Bands 1-5 and 7) and in a single 120 X 120 m thermal band (Band 6). The landsat 7, launched in 1999 carries an Enhanced Thematic Mapper Sensor (ETM+) which includes the 15-m panchromatic band intended for Landsat 6, and the additional improvement of 60-m spatial resolution (in band 6) for Earth temperature data. The higher spatial resolution enables more precise information on widespread land-use changes. The differences between TM and ETM+ is not in the spectral characteristics of individual bands, but in the improvement in the mode of acquiring TIR data in Band 6 and addition of a panchromatic band (Band 8), which has a spectral range of 0.52-0.90 Ám. The data in Band 6 is acquired with both a high- and low-gain. The visible, near-infrared, mid-infrared and thermal infrared Landsat Thematic Mapper Bands, separately and in different combinations, contain a lot of information and are particularly useful for many landcover mapping applications.
The spectral resolution of each of the 7 bands, plus the panchromatic band, are summarized in the following table, along with a description of the spatial resolution and the primary information that each of these bands can reveal:
Images below show the township of Aligarh and surrounding areas in different bands of the Enhanced Thematic Mapper.
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Department of Geology
Aligarh Muslim University, Aligarh - 202 002 (India)