The Table below shows the volume of air passenger traffic between Lagos and four other cities in Nigeria in 1985. Study the table and use the data in it to ...
Question 1 Report
The Table below shows the volume of air passenger traffic between Lagos and four other cities in Nigeria in 1985. Study the table and use the data in it to answer the questions that follow:
| S/N | Route | No. of passengers |
| 1 | Lagos - Abuja | 500,000 |
| 2 | Lagos - Enugu | 200,000 |
| 3 | Lagos - Port Harcourt | 400,000 |
| 4 | Lagos - sokoto | 300,000 |
(a) Using the attached map of Nigeria - Map B, construct a flow map/chart to represent the data in Table 1.
(b) State two advantages cf representing data with flow maps.
Answer Details
| S/N | Route | No. of passengers |
|---|---|---|
| 1 | Lagos - Abuja | 500,000 |
| 2 | Lagos - Enugu | 200,000 |
| 3 | Lagos - Port Harcourt | 400,000 |
| 4 | Lagos - Sokoto | 300,000 |
(a) Constructing the flow map / flow chart
A flow map shows movement between places by drawing a band (arrow) along each route whose width is drawn in proportion to the quantity of traffic along that route.
Step 1: Choose a width scale. Let 1 mm of band width = 50,000 passengers. Then divide each value by 50,000 to get the band width:
| Route | Passengers | Working | Band width |
|---|---|---|---|
| Lagos - Abuja | 500,000 | 500,000/50,000 | 10 mm |
| Lagos - Port Harcourt | 400,000 | 400,000/50,000 | 8 mm |
| Lagos - Sokoto | 300,000 | 300,000/50,000 | 6 mm |
| Lagos - Enugu | 200,000 | 200,000/50,000 | 4 mm |
Step 2: Draw the bands. On the map of Nigeria (Map B) draw a proportional-width band from Lagos to each city, each band ruled to the width above and following the direction of the route. Shade the bands, add arrowheads to show direction of movement, and provide a title and a key showing the width scale (e.g. a 1 mm band = 50,000 passengers).
(b) Two advantages of representing data with flow maps
- They show clearly the direction and route of movement between places, so the reader sees where the traffic goes as well as how much there is.
- The proportional band widths give an instant visual comparison of the volume of traffic along the different routes on the actual geographical map.
Download The App On Google Playstore
Everything you need to excel in your exams
