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Timeseries map
Votes by state for all US presidential elections.
Visual types
Level of expertise
Source:
Guardian Interactive (News)
http://www.guardian.co.uk/world/interactive/2009/jan/14/uselections2008-obama-white-house
Interactive features
User can choose year to view
Benefits & pitfalls to avoid
  • Shaded maps can emphasise large areas much more than small ones - for example highlighting rural areas over urban, if fixed population areas such as Super Output Areas are shown. Consider providing an alternate mode in which values are represented by circles, or values are scaled by the area size (ie showing density).
  • 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
  • Chloropleth maps can be created in a range of desktop GIS applications such as MapInfo and ArcGIS.
  • Tables can be created in a range of standard data applications such as Excel.