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Geography · Grade 11

Infrastructure, Accessibility and Networks

Roads, railways, pipes and power lines are networks, and network geography decides who can reach jobs, schools and clinics. Learners model infrastructure as graphs and measure connectivity, find least-time routes on a weighted network, measure accessibility with travel times, isochrones and service areas, and evaluate infrastructure options for equity and resilience.

  • 4 lessons
  • About 120 minutes
  • Networks and accessibility check: 10 questions
  • Ways to answer: choose an answer, highlight a text, pin a map, pick map regions, match pairs and type a number
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What learners will discover

  • Represent infrastructure as a graph of nodes and edges and calculate connectivity measures (beta and gamma indices).
  • Find least-cost routes on a weighted network and explain why the shortest route is not always the fastest.
  • Measure accessibility using travel time, isochrones, service areas and population coverage.
  • Evaluate infrastructure options for equity and resilience, including redundancy and single points of failure.

Lessons

  1. Networks as graphs 6 steps4 practiceabout 30 min
  2. Least-time routes 6 steps4 practiceabout 30 min
  3. Measuring accessibility 6 steps4 practiceabout 30 min
  4. Equity and resilience 6 steps3 practiceabout 30 min
  5. Networks and accessibility check 10 questions at the end

Keep exploring

More 11th grade geography

Guide for grown-ups