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Geography · 02 / 06

Read a map: legend, scale and choices

Middle school · Worked example and 4 exercises with solutions, at your pace.

UnderstandSee an exampleGuided exercise3 progressive challenges

The principle, simply

Maps select information about space. Read title, legend, date, source, unit, orientation and scale. Colours may denote categories or ordered values; the legend defines meaning. Class boundaries and projections affect perception. Missing symbols do not necessarily prove absence.

THE PICTURE TO REMEMBERRead a map: legend, scale and choices
  1. 01Map question
  2. 02Legend and unit
  3. 03Scale and date
  4. 04Bounded interpretation

WORKED EXAMPLE

From principle to reasoning

Classes 0–10, 10–50 and above 50 do not reveal exact values. A dark small area on a density map may not have the largest total population.

Solve a problem in this subject

  1. Choose scale

    Locate the area and compare local, national and global scales; meanings can change with scale.

  2. Read representations

    Check title, legend, unit, date, source and class boundaries. Density and population-count maps answer different questions.

  3. Identify actors and flows

    Connect places, movements, decisions and inequalities with located examples and interpreted data.

  4. Build a synthesis

    Organise a legend by ideas, then select area, line and point symbols. A sketch explains spatial organisation.

YOUR TURN

01 · Try before checking

Can inhabitants/km² directly give total population?

One hint

Another quantity is needed.

Reveal and understand the solution

Area is needed: population = average density × area. Colour alone cannot give the total.

Compare method, conditions and answer; identify the exact part to revisit.

IMPROVE THROUGH PRACTICE

Three additional challenges with solutions

Start with the first challenge. Write your method before opening a hint; use the solution to find the first step that needs work.

Reflect after practising
02 · Recognise and understandLink to this exercise

Two points are 3 cm apart on a 1:50,000 map. Find real distance in km.

A hint to get started

Keep matching units before conversion.

Step-by-step solution
  1. 3 × 50,000 = 150,000 cm.
  2. This is 1,500 m.
  3. Straight-line distance is 1.5 km.

Which step did you miss? Retry without help, then explain why the method works.

03 · Apply the methodLink to this exercise

Does a map coloured by total population directly show density?

A hint to get started

Density relates population to area.

Step-by-step solution
  1. A total is not people per km².
  2. Population must be divided by the relevant area.
  3. Read title, units and legend before interpreting colours.

Which step did you miss? Retry without help, then explain why the method works.

04 · Go furtherLink to this exercise

Two maps of one indicator look very different. What should be checked?

A hint to get started

Representation can change without a data change.

Step-by-step solution
  1. Compare dates, boundaries and sources.
  2. Check class thresholds and colour scales.
  3. A visual difference may reflect design choices rather than actual change.

Which step did you miss? Retry without help, then explain why the method works.

The trap to avoid

Compare dates, units, legends and classes before comparing maps.

Without notes, can you…

  • Explain the principle in your own words?
  • Rebuild the diagram and its connections?
  • Solve the exercise and justify the method?

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