YSEALI: Oceans Presentation

Analyze Image Composition

Create an Geo Animation

Step 1: Download the software and the images

  1. We will be using software called ImageJ.  It is available for all platforms.  Please download and install it.
    • If you would like to gather your own images, you can do so at the NASA Earth Observations site.
    • For these two images, I chose the Blue Marble: Next Generation images, but there are many others available (Sea Surface Temp, Chlorophyll Concentrations, Global Temperatures, etc.)
  2. If you could not get this to work, here are the two images:  Image 1 & Image 2

Step 2: Analyze snow density using ImageJ

  1. Open: Sample1.jpeg
  2. Analyze: Set Measurements:
    • Make sure Area & Limit to Threshold are selected. Press OK
  3. Analyze: Set Scale
    • Distance in Pixels: 720
    • Known Distance: 40075 (circumference of earth)
    • Unit of length:km
  4. Image: Type: 8-bit
  5. Image: Adjust: Threshold: Play with meters until only snow is selected. Press Apply
  6. Analyze: Measure
  7. Write down total area (this is the number of km2 that is snow)
  8. Do the exact same process for Sample 2.

Step 3: Compare snow area from Sample 1 & Sample 2

  1. Divide Threshold Area from Sample 1 by Threshold Area from Sample 2.  This is the percent difference in snow cover.

 

Step 1: Download the software and the images

  1. We will be using software called ImageJ.  It is available for all platforms.  Please download and install it.
    • If you would like to gather your own images, you can do so at the NASA Earth Observations site.
    • I chose the Sea Surface Temperatures images, but there are many others available (Sea Surface Temp, Chlorophyll Concentrations, Global Temperatures, etc.), and I saved 10 sequential images with the name sea
  2. If you could not get this to work, here is a folder.

Step 2: Import and create time model

  1. Open ImageJ
  2. File: Import: Image Sequence
  3. Number of Images 10
  4. Sort names numerically

Step 3: Watch and export

  1. File: Save As: .av

Explore more data and tools!

This is a great website that provides step-by-step instructions on how to do more analysis.