In most cases, imagery obtained directly from vendors or government agencies must be preprocessed before use. These lessons describe some of the common preprocessing steps, including:

  • Radiometric correction: Changing pixel values to correct errors or enhance certain things in an image
  • Atmospheric correctiong: Reducing the effects of atmospheric scattering on emergy measured by sensors
  • Spatial enhancement: Using neighboring pixel values to emphasize or deemphasize spatial details
  • Geometric correction: Reducing the effects of plaform movement, terrain displacement, and systematic noise to improve the positional accuracy of images.

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