Summary

About RGBs:

  • Generally made from three individual or differenced spectral channels; each is assigned to a primary color (red, green, or blue); the final product highlights atmospheric and surface features that are hard to distinguish with single channel images alone
  • Provide intuitive, realistic-looking products that can reduce ambiguities and simplify interpretation
  • In some situations, different features can have the same color or the same feature can appear in different colors. One way to handle this is loop the products
  • Can be overlaid with quantitative information, such as model data, enabling sophisticated analysis and interpretation
  • Are available online in near-real-time
  • Future satellite imagers will have far more channels than current satellites, leading to more RGBs and applications

Sources of RGBs:

The process of creating RGBs:

  • Step 1: Determine the purpose of the product
  • Step 2: Based on experience and/or scientific information, select three appropriate channels or channel derivatives that provide useful information
  • Step 3: Pre-process the images as needed to ensure that they provide or emphasize the most useful information
  • Step 4: Assign the three spectral channels or channel derivatives to the three RGB color components
  • Step 5: Review the product for appearance and effectiveness

Colors in the RGB color model:

  • Primary colors: Red, green, and blue
  • Secondary colors: Yellow (red + green), cyan (green + blue, and magenta (red + blue)
  • Gray: Equal amounts of any three colors
  • White: The primary colors in equal intensities
  • Black: The absence of the primary colors

Uses of RGB products:

List of applications for which RGB products can be used with the corresponding products

Commonly used RGB products:

Table of RGB applications and products, each with a description, satellite(s) involved, and use (day/night/both)

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