proportionate circles
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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]