At scale 1:50000, a map distance of 2 cm represents how many kilometres?
Answer and explanation
1 km
2×50000 cm=100000 cm=1 km.
Subjects
Geospatial data
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Sample exercises
Can every planar world map preserve all distances, areas and angles everywhere?
- Yes, every map does
- Only if coloured
- Only if printed large
- No
Answer and explanation
No
Flattening a curved surface entails tradeoffs.
Which describes a large-scale map?
- A map without coordinates
- Always a larger continent shown
- No scale denominator
- More detail over a smaller area
Answer and explanation
More detail over a smaller area
A larger representative fraction generally means greater local detail.
Why should one avoid inferring individual behaviour from a regional average alone?
Answer and explanation
An aggregate can combine varied individuals and does not determine their separate characteristics. This is an ecological-inference risk.
Credit aggregation versus individual inference.
A region has 400 people over 20 km². Find mean population density.
Answer and explanation
20 people/km²
400/20=20.
Which metadata helps judge whether a map is current enough for a task?
- Only the font
- Only the number of colours
- The data date
- Only a decorative border
Answer and explanation
The data date
Changeable geographic data require temporal context.
Study notes
Map projections, scale and spatial evidence
Representing a curved surface on a plane introduces distortion. Different projections preserve different properties and suit different tasks.
Grades 9–12Map projections, scale and spatial evidence · revision notes
Representing a curved surface on a plane introduces distortion. Different projections preserve different properties and suit different tasks.
Grades 9–12