The Enhanced Thematic Mapper is found on the Landsat 7 satellite. It is a type of remote sensing that falls under the category of multispectral imagery. The Enhanced Thematic Mapper records seven bands that are divided by wavelength. The images taken are useful when comparing before and after images. The area of the real world image can be determined by counting the number of pixels. The example Enhanced Thematic Mapper illustration shown above, exhibits the before and after photographs of Japan after an earthquake and tsunami on March 11, 2011.
http://www.earthzine.org/2011/03/23/earth-observation-resources-on-the-tsunami/
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