In proportional circles, the size of each circle is proportional to the total value of the data it represents, e.g. the largest value is represented by the largest circle

• Proportional circles are suitable where it is necessary to compare absolute totals such as total crop production or export earnings in different periods.
• They give a good visual impression of totality. This makes the comparison of totals easy as the size of each circle corresponds to the total amount it represents.
• They can be combined with other methods on the same map to assist in data analysis especially when describing population distribution.

• This is a very tedious and rime-consuming method of representing data since the diameter and radii measurements have to be calculated.
• It is not possible to determine the actual total values for each period from the circles since the totals are represented by the sizes of the circles.
• Where the sets of data to be represented are many, the comparison of the circles becomes difficult.
• Where the differences between the values being represented are too big, it becomes difficult to represent the extreme values as it results in very big and very small circles.

• Where the differences in the values to be represented are very small, all the circles will be almost the same size, making comparison very difficult.

RELATED POSTS