Chloropleth map

• Choropleth maps use a system of colour and shades to illustrate the density change from area to area.
• Choropleth map shades change according to a pre-arranged key.
• Choropleth maps are useful when showing standardised data such as rates, densities, or percentages.
• Choropleth maps are visually effective as you can see a large amount of information and general patterns.
• the map shows X so it can be used to compare countries/areas
• Chloropleth maps have levels of shading/colour that are visually effective at showing different values.
• A completed choropleth map hides any variation within each area and seems to assume the whole are has the same value
• It can sometimes be difficult to distinguish between the shading used on the map.
• The boundaries of the countries also give artificial divisions between the colours, where as the change would be more gradual
• On choropleth maps the values in each area are averages and don't consider other factors such as relief, climate or economic activity.
• Choropleth maps are suitable for showing total values - use a proportional symbol map