A nominal area choropleth map is used to dispaly nominal data, and nominal data is typically categorical data where the order of the categories is arbitrary. This is one such map of the entire continent of Africa, portions of southern Europe, and Western Asia. This would be important for African political figures to see their surrounding nations and the distance they are from them. Although Spain is technically in Europe, it is much closer to Morocco than Morocco is to Somalia or Kenya or most other countries in it's own continent, Africa.
URL:http://dianesmapcatalog.blogspot.com/2008/08/nominal-choropleth-map.html
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