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1. Go to the Start menu
2. Click My Computer
3. Double click on the O: Drive
4. Folders are listed alphabetically by department.  Double click on the envstudies folder.
   autoplay dialog box O drive folders
   
5. Double click on the GIS Tutorial folder.  Inside you will see the Cartograms folder.
6. Right click on the CartogramsTutorial folder, and choose the Copy option.
7. Close the GIS Tutorial window.
8. 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.

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Open the USPop2007 Map Project 

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1. Open ArcMap.
2. Click the An existing map; button.
3. In the Browse area, highlight Browse for maps…
4. Click OK.  The Open dialog box should appear.
5. In the Look In: pull down menu, choose Desktop. 
6. Highlight the CartogramsTutorial folder.  Click OK.
7. Highlight the USPop2007.mxd map project.  Click OK.

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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 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.
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Repair Data Source

1. Right click on the 2007 Population by County map layer.  In the pop-up menu, choose Data → Repair Data Source.  The Data Source dialog box will appear.
2. In the Look In: menu of the Data Source dialog box, navigate to the CartogramsTutorial folder on the Desktop.   If you do not see a path to the Desktop, you can find it in I:\YourUserName\Desktop. 
3. Double click on the CartogramsTutData.mdb personal geodatabase.
4. Highlight the Counties file and click Add.  The Counties file was renamed to 2007 Population by County in the ArcMap Table of Contents for the Map Project, but retains its original name in the Personal Geodatabase.

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Add the Cartograms Tool to ArcToolbox

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1. Open ArcToolbox by clicking on the ArcToolbox button.
2. Right click on the white space inside the ArcToolbox menu.  Choose New Toolbox.  A new, unnamed toolbox will appear in the Toolbox menu.  Name it Cartograms.
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   ArcToolbox Cartograms Menu
3. Right click on the title of the new Cartogram toolbox.  Choose Add → Tool.
4. Check the box next to the Cartograms option.  Click OK.

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Your dialog box should look like this:
autoplay dialog box Create Cartogram Dialog Box

3. Click OK.

A Cartogram will be created in the new layer. Cartograms distort map shapes to emphasize specified values from underlying map data. In this case, shape of the U.S. map will be distorted to reflect the population density of each area, since you chose to use the POP07_SQMI value from the attributes of the 2007 Population by Counties Map Layer as your Value Field for analysis. Areas with greater population densities will be larger than those with smaller population densities. This new layer will not be Symbolized – meaning that the color scheme indicating population density has not been transferred from the 2007 Population by County Map Layer.

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1. Right click on the Counties_Cartogram Map Layer.  Choose Properties.  The Layer Properties dialog box will appear. 
2. Click the General Tab.  In the Layer name field, type 2007 Population Density Cartogram.  This will rename the Counties_Cartogram Map Layer.  Click Apply.
3. Click the Symbology tab.  In the Show: menu, choose Quantities → Graduated colors.  Use the default color ramp.
4. In the Fields area under Value:, choose POP07_SQMI.
5. Under Classification, click on the Classify button.  The Classification dialog box will appear. 
6. At the top, left hand side of the Classification dialog box, under Classification, change the number of Classes from 5 to 4.  Click OK.
7. Back in the Layer Properties →Symbology area, under Color Ramp, click on the Label title and choose Format Labels.
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   Symbolize Quantities Value Pulldown Menu and Color Ramp
8. In the Number Format dialog box under Rounding, change the Number of decimal places to 0.  Click Apply.
9. Click on the Labels tab.
10. Check the box next to Label features in this layer. 
11. Under Text String in the Label Field, choose the value STATE_NAME from the pull down men.
12. Click OK.
13. Turn off the 2007 Population by County layer by un-checking the box next to its title in the Table of Contents.
    The graphic clearly emphasizes the areas of greatest population density in the continental U.S., with the Mid-Atlantic region being the most densely populated.
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    Cartogram Output Map