Part 1—Download Software and Data
Step 1 – Download and Install ImageJ Software
ImageJ is in the public domain. It can be freely downloaded and installed on any computer including those at schools, homes, and businesses.- Go to the ImageJ Download page and open it in a new window.
- Click the link that appears directly below the name of your computer's operating system (e.g., Mac, Linux, Windows). This action will transfer a compressed file of the software to your computer. Your browser should automatically expand the file, creating an ImageJ folder on your computer's hard drive. For more detailed instructions from the ImageJ website, click Installation Instructions ( This site may be offline. ) , then select your operating system.
Note to Windows Users: It is recommended that you install ImageJ in the Documents directory, rather than in the Program Files directory. For security reasons, Windows 7 and Windows Vista do not allow programs to alter themselves by writing files to the Program Files directory. If ImageJ is installed in the Program Files directory, then the update function in Step 2 below will not work properly. In addition, if you are a Windows Vista user, be sure to choose the correct version of ImageJ (either 32-bit or 64-bit) for your computer.
Step 2 – Update or Downgrade ImageJ
ImageJ update dialog box. Double-click the ImageJ icon 
to launch the application and choose Help > Update > ImageJ.... A window will appear, telling you the version you are currently running and a list of upgrade versions. Choose the version you want to upgrade to (usually the most recent, or default version) and click OK. After the update downloads, you will need to re-launch ImageJ to run the new version.
ImageJ update dialog box showing upgrade and downgrade options. ImageJ is a professional research and analysis tool, and is under constant development. If the latest update of the application introduces new bugs or errors, or has an unfamiliar interface that does not match the written instructions, and screen shots provided, you can downgrade your copy of ImageJ to an older, more stable or familiar version. The version used in this chapter is 1.45.
Step 3 – Locate and Download Ozone Images
Go to the TOMS file transfer protocol site to locate and download the TOMS EarthProbe images for October 1st, 1996-2005.
- Click this link to go through the site's FTP (File Transfer Protocol) interface. This link takes you to three folders: global, npole, and spole. Choose "spole" for the Antarctic (South Pole) images.
×![[creative commons]](/images/creativecommons_16.png)
- Once in the "spole" folder, you will need to open the correct "Year" folder. In this case, the 1996 folder is shown.
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- Once in the "Year" folder, scroll down, and choose the date that interests you. October 1996 is shown as .../IM_ozspl_ept_19961001.tif
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- Once you have located the correct image, right-click (or ctrl-click on Macs) and choose File > Save Link As......
- Save the image in a new folder named "TOMS Images" on your desktop, or documents folder. Keep the default name for the image, or give it a name that includes the date it represents.
- After you've downloaded the first image, click your browser's back button. Select the next folder, 1997, scroll down and locate the next image, then save it to your folder of images.
- Repeat these steps until you've requested and saved TOMS images of October 1 for every year from 1996 through 2005. You will have 10 images.
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