Geological Survey (USGS) are either gray-scale, natural color, or color-infrared (CIR) images with 1-meter ground resolution. They cover an area measuring 3.75-minutes longitude by 3.75-minutes latitude or 7.5-minutes longitude by 7.
For example, the spectral signature of visible (to the human eye) light is typically recorded by black-and-white photographic film, while light in the near infrared and thermal infrared portions of the spectrum are recorded on color-infrared film ...
This camera can simultaneously collect panchromatic, color and color-infrared stereo imagery.
 See also: Cover, Feature, Information, Image, Coverage
  
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