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Cartograms are a method of displaying geospatial data as totals, wherein data are displayed with both color and area as a function of their values. Cartograms are analogous to pie charts in which the slices of the pie are geographic regions rather than wedges. The Cartograms tool is a script created for ArcGIS that provides a set of spatial analysis tools not included in the standard ArcGIS software. You can create maps that will provoke reactions and dialog by displaying data as Cartograms. This tutorial will allow users to make Cartograms using their own data.
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CartogramsTutoral Personal Geodatabase.mdb
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Cartograms ArcMap Tutorial File.mxd
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Copy Data Files to Your Computer
To complete this tutorial, you will need to copy the Cartograms folder from the O:\envstudies\GIS Tutorials folder to the desktop of your computer. If you have done this already, skip to the next section, Start a New Map Document.
Download Cartograms Tutorial Files
Download the zipped tutorial files at: CartogramsTutorial.zip Be aware that the zipped package is approximately 5MB, so please allow sufficient time and memory space on your computer for download.
- A dialog box will appear titled, "Opening CartogramsTutorial.zip." Save the file to your computer's Desktop.
- Navigate to the desktop of your computer and unzip the file. To do this, right click on the CartogramsTutorial.zip folder. (click image to enlarge)
- Choose Extract All. The Windows Extraction Wizard will appear.
- Click Next. Make sure that the field under "Files will be extracted to this directory" points to your computer's desktop. (click image to enlarge)
- If it does not point to your computer's Desktop, click the Browse button. The select a destination dialog box will appear.
- Choose the Desktop option that appears at the very top of the window in the dialog box. You may need to use the scroll bar on the right hand side of the window to see the Desktop Option. (click image to enlarge)
- Click OK.
- Once this field points to your computer's Desktop, click Next. Windows will unzip the file and tell you that the extraction is complete.
- Click the Finish button
- Click on the CartogramsTutorial Personal Geodatabase.mdb link above. A dialog box will appear asking you if you want to save the file.
- Click Save File. This will save the file to the default location set in your web browser. When you download the file, a It may be the Downloads folder in your computer or some other location. Make sure that you know where the files are
- Double click on the O: Drive
- Folders are listed alphabetically by department. Double click on the envstudies folder.
O drive folders - Double click on the GIS Tutorial folder. Inside you will see the Cartograms folder.
- Right click on the CartogramsTutorial folder, and choose the Copy option.
- Close the GIS Tutorial window.
- Right click anywhere in the blank, blue space on the Desktop of your computer. Choose the Paste option. You should now see the CartogramsTutorial folder on your Desktop.
Install the Cartograms Tool
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ArcMap sets file paths to find the data for each of your map layers. Because you moved the data files from the O:\envstudies drive this site to your Desktop, the file paths that ArcMap stored are no longer accurate. You can easily repair the file paths. This is something you will need to do each time you want to use a Map Project you’ve copied or moved from one location to another.
Repair Data Source
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