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Gallery: Distorted map (cartogram) + Choropleth map + Distorted map (cartogram)

4 unique examples
Showing visual types:Choropleth map Icon for removing this tag Icon for this tag's benefits and pitfalls Icon for how to create this kind of visualisationDistorted map (cartogram) Icon for removing this tag Icon for how to create this kind of visualisation

Benefits & pitfalls

Benefits & pitfalls: choropleth map

  • 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).

How to create your own

Create your own: choropleth map

  • Chloropleth maps can be created in a range of desktop GIS applications such as MapInfo and ArcGIS.

Create your own: distorted map (cartogram)

  • There are currently no commercial applications that create cartograms, although some routines are available on the web from Cartogram Central and World Mapper.

Cartogram (distorted map) showing recorded crime counts

Screenshot for 'Cartogram (distorted map) showing recorded crime counts'
The two maps both show levels of recorded crime across Leicestershire at Lower Super Output Area LSOA level (with darker red representing higher levels of crime). The map on the left shows the actual geography of the LSOA areas across the County. LSOA areas each contain roughly 1,500 residents - larger areas on this map therefore represent rural areas with lower-density population. The cartogram, or distorted, map on the right shows the same data at LSOA level, but represents each of the LSOAs as a fixed size hexagon. This avoids the problem of over-emphasising the more rural LSOAs, seen on the left. However, it becomes more difficult for users to understand which areas are which - so a numbered key is used to identify particular areas.
Average rating: 9.1 (7 votes)

Cartogram thematic map (where areas are sized according to their population)

Screenshot for 'Cartogram thematic map (where areas are sized according to their population)'
Proportion of people claiming benefits in English cities, 2003.
Average rating: 2 (1 votes)

Interactive cartogram

Screenshot for 'Interactive cartogram'
Local Council election results 1974 to 2008.
Average rating: 4.5 (2 votes)

Rectangular choropleth cartogram of people with HIV

Screenshot for 'Rectangular choropleth cartogram of people with HIV'
A world-view cartogram for World's Aids Day. The size of a region indicates the number of people infected with HIV - each square being 10,000 people infected. The colour of a region indicates the rate of infection, in relation to the global average.
Average rating: 10 (3 votes)