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Geography · Grade 8

Geospatial Tools and Projection Critique

How does a phone know where it is? How can satellites spot a forest being cleared? Learners investigate the three great geospatial tools — satellite positioning (GNSS), remote sensing and GIS layers — and then turn a critical eye on the maps those tools produce: the Mercator–Peters debate, the Web Mercator maps on our screens, and how centring and orientation shape the way we see the world.

  • 4 lessons
  • About 105 minutes
  • Geospatial tools and critique check: 10 questions
  • Ways to answer: choose an answer, pin a map, pick map regions, match pairs, type a number and put in order
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What learners will discover

  • Explain how satellite positioning (GNSS such as GPS) finds a location by trilateration, and describe its accuracy limits.
  • Explain how remote sensing works, including spatial resolution and false-colour images, and what it can and cannot reveal.
  • Explain how GIS layers, buffers and overlays answer spatial questions such as where to locate a service.
  • Critique projection and design choices — including the Mercator–Peters debate, Web Mercator, centring and orientation — and the messages they send.

Lessons

  1. How satellite positioning works 7 steps4 practiceabout 26 min
  2. Remote sensing: seeing from above 6 steps4 practiceabout 26 min
  3. GIS: layers that answer questions 6 steps4 practiceabout 26 min
  4. Critiquing the maps we see 6 steps3 practiceabout 27 min
  5. Geospatial tools and critique check 10 questions at the end

Keep exploring

Games to practice with

  • Globe ExplorerSpin a real 3D globe, flip to the flat map, and find continents, oceans and countries.
  • Pin the PlanetDrag the pin onto wonders, cities and exact latitude and longitude points.
  • Route PlannerFind the shortest way around town, dodge closed roads, and measure trips with a scale bar.

More 8th grade geography

Guide for grown-ups