Map (multi layer): Ageing population
- 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).
- Using area or volume to represent data can distort data values, and exaggerate differences between values. For example, if the radius of the circle is used to represent data values, the area of the circle will quadruple if the data values double. There is also an issue of 'perceptual scaling' - the tendency of people to underestimate areas.
- Bubble charts can be created in a range of standard data applications such as Excel.
- Bubble maps can be created in a range of desktop GIS applications such as MapInfo and ArcGIS.
- Chloropleth 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.