choropleth method

CHOROPLETH METHOD

The very word choropleth has been derived from the two greek words namely “choros” meaning “place and “plethron” meaning “measure”. Thus  the literal meaning of choropleth is quality in area . This method is primarily used to show the distribution of commodities per unit area, average measure or percentage etc.

Example density of population, male-female(sex)ratio ,percentage of agricultural land to the total land or percentage of hindi speaking population to the total population  etc.

     METHODS OF CONSTRUCTION

•      Obtain an outline map of the concern area along with the administrative boundaries.
•       Arrange the data in ascending or descending order.
•       Divide the given data in proper class intervals and name them A,B,C,D,E etc .and using a pencil write  A,B,C,D,E on the map according to data of the concerned  administrative unit
•  Fix suitable shades for these class intervals and place them in their respective administrative units.
•   Care should be taken while selecting the shades that the intensity of shades increases with        increase in value shown.
• Make the index and show all the shades corrrectly along with their class intervals in proper sequential order
•        Write the heading appropriate to the size and data given on the map