Notes
Maps
- Reference maps show locations (political, physical, road maps). Thematic maps show data: choropleth (shaded areas by rate), dot density, graduated symbol, isoline (lines of equal value, like elevation), and cartograms (sizes changed to show data).
- Every flat map has distortion of shape, area, distance or direction. The Mercator projection keeps direction for navigation but greatly enlarges land near the poles; equal-area projections (like Gall-Peters) keep size but distort shape.
Geographic data and tools
- GIS (Geographic Information Systems) layers data on maps. GPS finds exact locations. Remote sensing collects data from satellites and aircraft.
- Data come from field observation, surveys, censuses and satellite images.
Key concepts
- Absolute location (latitude and longitude) vs relative location (in relation to other places). Site is a place's physical features; situation is its connections to other places.
- Place is the unique character of a location; space is the area between places. Distance decay: interaction decreases with distance. Time-space compression: technology makes places feel closer.
- Scale: local, regional, national, global. Patterns can look different at different scales.
- Regions: formal (shared trait, like a language region), functional (organized around a central node, like a newspaper's delivery area), and perceptual/vernacular (based on people's feelings, like "the South").
Human-environment interaction
- Environmental determinism: the environment controls human behavior (now rejected).
- Possibilism: the environment sets limits, but people choose how to adapt.
- Sustainability and land use are central themes.
Practice
Darker shading usually means a higher value.
Greenland looks as large as Africa but is far smaller.
Site refers to physical characteristics of the place itself.
It's organized around a central point.
Farther places have fewer connections.
It replaced environmental determinism.
It combines many data layers on maps.
Perceptual regions are based on beliefs and feelings.
Free response
Write your answer first, then open the scoring guide.
Free-response question
A city planner uses a map showing the percentage of households without a car in each neighborhood.
(a) Identify the type of thematic map most likely used.
Show the answer and scoring guide
A choropleth map, which shades each neighborhood based on its percentage.
Check off the points you earned:
(b) Explain ONE limitation of this type of map.
Show the answer and scoring guide
It shows the same shade across a whole neighborhood, hiding differences within it, and large areas can look more important than small, dense ones.
Check off the points you earned:
(c) Explain how the planner could use GIS to decide where to add bus routes.
Show the answer and scoring guide
Layer the car-ownership map with population density and existing transit lines to find dense areas with few cars and no nearby bus service.
Check off the points you earned: