Question

Key concepts to review: scale (local → global), map projections and distortion, map types (choropleth, dot, proportional symbol, cartogram, isoline), GPS vs GIS, reference vs thematic maps, scale of analysis, enumeration units (state, county, zip), map limitations and bias.
Short Answer Review
1. Define scale of analysis and give one example of how conclusions change between neighborhood and national scales.


2. What is GIS and how is it different from a single map?


3. Why does every flat map distort the globe? Name one area (shape/area/distance/direction) commonly distorted by the Mercator projection.


4. Explain the difference between a reference map and a thematic map.


5. What is cartographic generalization, and why do mapmakers use it?


Answer each question in a short answer

Answer 1

1. Scale of analysis: the geographic extent and resolution at which data are examined (e.g., block, neighborhood, city, state, nation). Example: at the neighborhood scale a map might show a localized crime hotspot that requires targeted policing, while at the national scale that hotspot is invisible and would not affect national crime-policy conclusions.

2. GIS (Geographic Information System) is a computer-based system for capturing, storing, managing, analyzing and visualizing spatial data in layered, queryable form. Unlike a single static map, a GIS contains multiple data layers, a database and tools for spatial analysis and dynamic map creation.

3. Every flat map distorts the globe because you cannot project a curved surface onto a plane without changing some properties (shape, area, distance or direction). The Mercator projection commonly distorts area—making high-latitude regions (Greenland, Antarctica) appear much larger than they actually are.

4. Reference map: shows the locations and relationships of physical or political features for navigation and orientation (e.g., road map, political map). Thematic map: emphasizes the spatial distribution of a particular variable or theme (e.g., choropleth of income, dot map of population).

5. Cartographic generalization: simplifying, aggregating or omitting geographic detail when making a map at a smaller scale. Mapmakers use it to reduce clutter, preserve legibility, and highlight important patterns that would be lost if every detail were shown.