Proportional Circle Diagram // PRACTICAL GEOGRAPHY CC2//GEOA
Definition:
Circles or wheel diagrams is a another type of 2-Dimensional diagram, where a series of circles proportional in size which represent to quantities. It is also called Proportional area chart.
Type:
Generally circle diagram are two types –
a. Simple Circle Diagrams: When each proportional circle represents a single value of only one component of data.
b. Compound Circle diagrams or Wheel diagrams or proportional pie diagrams or pie charts:When the more than one component data comprises within a circle and also it respectively divided into angular segments to show its componential parts.
Principle of the Circle diagram:
The area (A) of a circle for a accountable item (i) is directly proportionate to the quantity (Q) of the item to be represents. So, a circle of one unit area (A) represents a quantity (Q). Another word, item being proportionate in diameter in terms the amount of area or figure of item they represent, are often placed in thematic maps, more or less within the boundary of the respective administrative division.
Method:
The radius of such circles can be computed by considering the respective area as (Q) = 𝜋 𝑟 2 Or, 𝑟 2 = 𝑄 𝜋 Or, Radius of a circle (r) = 𝑄 𝜋 ………………………………(i) (Where, „r‟ is the radius of the circle, and „Q‟ usually represent the total quantity of the area)
Characteristics:
The circumference of all circles will be 360O, but the angular of the segment of the circle is
heterogeneous.
The homogeneous color or shade can be used inside each circle. But in the case of pie diagram,
different shades or shading are used for each segment.
Advantages
This diagram displays the relative proportions of multiple classes of data
The size of the circle is represented in proportion to the total quantity.
This diagram summarizes a large data set in visual form.
This diagram is visually simpler than other types of graphs.
This diagram allows a visual check of the rationality or accuracy of the calculation.
This diagram requires a minimum of additional explanations.
This diagram is easily understood due to its wide use in business and media.
Disadvantages
This diagram do not easily reveal exact values.
Many pie charts may be needed to show changes over time.
This diagram fails to reveal key assumptions, causes, effects, or patterns.
This image is to be easily manipulated to get yield a false impression.
Limitation:
Proportional circle or Pie diagram should be placed in such a way that they do not touch the respective administrative boundaries. However, in some cases, if the unit is longer than the size of an administrative area on the map, then any part of the diagram may exceed the administrative boundary, which is acceptable.
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