proportionate circles

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root Sq.Rt *0.16 Measurement

(mm/cm)

Heathrow   68,652   262.015   42   42mm/4.2cm  

Gatwick   32,890   181.35   29   29mm/2.9cm  

Stansted   18,439   135.7   22   22mm/2.2cm  

Luton   9,268   96.27   15   15mm/1.5cm  

London  City   2,883   53.69   9   9mm  /0.9cm  

Southampton   1,739   41.7   7   7mm  /0.7cm  

[Source:  CAA,  2011]  

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root

Heathrow   68,652   262.015  

Gatwick   32,890   181.35  

Stansted   18,439   135.7  

Luton   9,268   96.27  

London  City   2,883   53.69  

Southampton   1,739   41.7  

[Source:  CAA,  2011]  

Step 1: Work out the square root of terminal passengers

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root Sq.Rt *0.16 Measurement

(mm/cm)

Heathrow   68,652   262.015   42   42mm/4.2cm  

Gatwick   32,890   181.35   29   29mm/2.9cm  

Stansted   18,439   135.7   22   22mm/2.2cm  

Luton   9,268   96.27   15   15mm/1.5cm  

London  City   2,883   53.69   9   9mm  /0.9cm  

Southampton   1,739   41.7   7   7mm  /0.7cm  

[Source:  CAA,  2011]  

Step 2: Reduce the square root figure to create a series of symbols that will fit on the map

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root Sq.Rt *0.16 Measurement

(mm/cm)

Heathrow   68,652   262.015   42   42mm/4.2cm  

Gatwick   32,890   181.35   29   29mm/2.9cm  

Stansted   18,439   135.7   22   22mm/2.2cm  

Luton   9,268   96.27   15   15mm/1.5cm  

London  City   2,883   53.69   9   9mm  /0.9cm  

Southampton   1,739   41.7   7   7mm  /0.7cm  

[Source:  CAA,  2011]  

Step 2: After some experimentation with different sizes a reduction of 84% (*0.16) was calculated

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root Sq.Rt *0.16 Measurement

(mm/cm)

Heathrow   68,652   262.015   42   42mm/4.2cm  

Gatwick   32,890   181.35   29   29mm/2.9cm  

Stansted   18,439   135.7   22   22mm/2.2cm  

Luton   9,268   96.27   15   15mm/1.5cm  

London  City   2,883   53.69   9   9mm  /0.9cm  

Southampton   1,739   41.7   7   7mm  /0.7cm  

[Source:  CAA,  2011]  

Step 3: PowerPoint measures in cm so adjust your figures accordingly

Terminal Passengers at South East Airports 2011

Airport Terminal

Passengers (000s)

Square Root Sq.Rt *0.16 Measurement

(mm/cm)

Heathrow   68,652   262.015   42   42mm/4.2cm  

Gatwick   32,890   181.35   29   29mm/2.9cm  

Stansted   18,439   135.7   22   22mm/2.2cm  

Luton   9,268   96.27   15   15mm/1.5cm  

London  City   2,883   53.69   9   9mm  /0.9cm  

Southampton   1,739   41.7   7   7mm  /0.7cm  

[Source:  CAA,  2011]  

Step 4: Plot your values on your map and label accurately (see next slide)

Terminal Passengers at South East Airports 2011 Legend Terminal Passengers (000s)

70,000

50,000

10,000

1

2

3

4

5

6

1 - Heathrow Airport 2 - Gatwick Airport 3 - Stansted Airport 4 - City of London Airport 5 - Luton Airport 6 - Southampton Airport [Source: CAA, 2011]