Mini Lesson

Creating Images from Numbers

Mini Lesson

Materials:

  • Colored pencils or crayons: White, Orange, Red, Yellow, Green, Blue, Black
  • Handouts

Procedure:

  1. Use the color table provided or complete the table to create your own color 'pallet'.
  2. If you create your own, select each color to represent numbers in the ranges with no color identified
  3. Use the 100-cell grid provided to color the cells on your grid with the colors in your table.
  4. Explain: The you image created is called a false-color image because the image is made from colors assigned to numbers and not a photograph.
  5. Teacher Note: Explain to students that the numbers are data that could come from many different sources. The concept of creating an image from data is the same regardless of where the data come from. The questions are designed to help students understand that the image represents information about the data.

Color TableColors for each number range

Number Key

 

The image you created is called a false-color image because the image is made from colors assigned to numbers and not a photograph.

Answer the questions.

  1. Answer the following questions if the numbers are wind speed in km per hour.
    • What color is the fastest? Slowest? 
    • Where is the wind between 21-25 km per hour? 
  2. Answer the following questions if the numbers are elevation in meters above sea level.
    • What color is the lowest? Highest? 
    • Where is the elevation between 31 and 35 meters above sea level? 
  1. Do you notice any pattern in the image? 
  2. How does the size of the grids in the grid paper affect the image that is created?  
  3. Which do you think would be more realistic, larger grid sizes or smaller?  Why?

Sources:

  1. Space Math - https://spacemath.gsfc.nasa.gov/
  2. Landsat Math - https://landsat.gsfc.nasa.gov/landsat-math-2/

Scientific data are often represented by assigning ranges of numbers to specific colors. The colors are then used to make false color images which allow us to see patterns more easily. Students will make a false-color image using a set of numbers.