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PlayOwl

Geography · Grade 11

Raster and Vector Models

Every GIS stores the world in one of two ways: as vector features (points, lines and polygons with attributes) or as raster grids of cells. Learners choose a data model for a phenomenon and scale, reason about raster resolution and mixed pixels, calculate slope and reclassify a digital elevation model, and chain vector operations such as buffer and overlay into a site-suitability workflow.

  • 4 lessons
  • About 120 minutes
  • Raster and vector check: 11 questions
  • Ways to answer: choose an answer, estimate, highlight a text, pin a map, match pairs and type a number
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What learners will discover

  • Distinguish vector and raster data models and choose a suitable representation for a phenomenon at a given scale.
  • Explain raster resolution, calculate cell counts and storage effects, and recognise mixed pixels.
  • Analyse a digital elevation model by calculating slope, reclassifying cells and interpreting flow.
  • Apply buffer, overlay and spatial query operations to answer a site-suitability question.

Lessons

  1. Two ways to store the world 6 steps4 practiceabout 30 min
  2. Resolution and mixed pixels 6 steps4 practiceabout 25 min
  3. Working with elevation grids 7 steps5 practiceabout 35 min
  4. Buffer, overlay and site suitability 7 steps4 practiceabout 30 min
  5. Raster and vector check 11 questions at the end

Keep exploring

More 11th grade geography

Guide for grown-ups