Nominal Area Choropleth Map

The above map is a nominal area choropleth map.  As mentioned before a choropleth map uses differences in shading, coloring, or the placing of symbols within predefined areas to indicate the average values of a property or quantity in those areas.  Nominal scale: The differences in data are only of qualitative nature, for example: differences in gender, language, land use or geology.  The above nominal area choropleth map shows access to safe drinking water. 

The map URL is: http://geoportal.icimod.org/TrainingandEducation/GISforBeginners/p1ch8/