About RGBs:

  • Generally made from three or more 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 to animate the products
  • Can be overlaid with quantitative information, such as model data or other observational data, enabling more sophisticated analysis and interpretation
  • Are increasingly available online and in near real-time
  • Future satellite imagers will have increasing numbers of spectral channels, allowing for more RGBs and new applications

Sources of RGBs:

The process of building RGBs:

  • Step 1: Determine the purpose of the product
  • Step 2: Based on experience and available 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; revise or tune as needed

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)

You have reached the end of the module. Please consider taking the quiz and filling out the survey.