Maharashtra State BoardSSC (English Medium) 9th Standard
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Answer in Brief. Explain the Use and Types of Distributional Maps. - Geography and Economics

Answer in Brief

Answer in brief.
Explain the use and types of distributional maps.

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Distribution maps are a form of thematic maps that are used to represent the distribution of particular geographic elements within a given region. It utilizes the statistical data of the chosen element to create a map which provides the user with a visual representation the particular variable’s distribution. A properly made distributional map makes it easy to visualize how a certain variable or element varies over a region. It can be used to represent qualitative data like vegetation or soil in a region or quantitative data like population density or average annual rainfall in a region. The following table gives a classification of the different distributional maps along with their advantages and disadvantages.

Type  Methodology and usage Advantages  Disadvantages
Dot Maps  Use dots to represent precalculated values of chosen variable. Easy to read maps. Improper methodology leads to human error in map Interpretation. 
  Dot used should b uniform in size corresponding to their index. Proper mathodology provides clear precie pattern for study.  Dense Dot distribution can lead to improper results 
  Dot Placement is dependent on presence of natural and man-made features like rivers roads etc. Multi colored dots on the same map allowqs proper study of related phenomena like rural population and agricultural production.  
  Mostly used for variables that are scattered throughout the chosen region of study.    
Choropleth Maps  The date for different geographical variables is represented by either shades of the same color or by different colors. Popular form of representation as it is easy to read and interpret. Cannot be used  for contnuous data as it is limited by administrative boundries. Thus variables like temperature and rainfalls cannot be represented by these maps.
  Every sub-administrative region has one assigned value.     
  Data is divided in calsses after ascertaining the highest nd lowest values, with each class getting a particular shade.     
  The shade becomes darker with increasing value of the given variables.    
Isopleth Maps  Isolines are line lines which join the places having the same date on a map like lines joining places having equal rainfall. These maps are ideal for showing the gradual change in variables over space and or time. For eg, temperature,rainfall, altitude are best represented by these maps.  Bot suitable for showing variables that are unevenly distributed in a given region like forest cover or agricultural land. 
  The ranges are between two isolines are often colored to represent the data diversity which creates the isopleth maps.     
Concept: Distributional Maps - Choropleth Method
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Balbharati Social Science Geography 9th Standard Maharashtra State Board
Chapter 1 Distributional Maps
Exercise | Q 2.1 | Page 7
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