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The outer circle illustrates presidential periods, the governing party, and whether or not the President died in office. The first inner circle shows the "eras" in history that those time periods covered. The third inner circle shows key foreign conflicts and wars. The fourth inner circle (purple) shows key legislative acts (or series of bills) that were issued. Finally, the bubbles in the middle indicate the average national debt, as indicated every 8 years.
When using colours to portray data values or types, ensure that the colors used are accessible to all users. Online tools such as ColorBrewer (www.colorbrewer.org) can help identify issues with colours used.
Create your own
Bubble maps can be created in a range of desktop GIS applications such as MapInfo and ArcGIS.
Some combination charts, such as bar and line charts, can be created in standard applications such as Excel (using more than one axis). Others can be combined by saving visualisations as image files and combining in an image editor.
Time lines can be created in a range of standard data applications such as Excel More sophisticated visualisations can be created using commercial packages such as Tableau, or development languages such as Processing.
Examples presented on this site have been taken from published material available on the web. If you are the author of the example, and would like this removed from the site (or additional information provided), please contact us. Where shown, Ordnance Survey data is reproduced under Communities and Local Government Licence 100024857. Crown copyright material is reproduced with permission of the controller of HMSO.