Which map type would you use to emphasize a single thematic variable across an area, such as population density?

• A. Site
• B. Reference Map
• C. Global Positioning System
• D. Thematic Map

Answer: (D)

A thematic map is designed to highlight a single variable across space, making patterns of that variable easy to see over an area. For example, population density can be shown with shading or varying dot sizes so you can quickly spot where densities are high or low and how they differ across regions. This focus on spatial distribution of one attribute is what sets it apart from other map types. A site map centers on features of a single location, not a broader variable across many places. A reference map provides general geographic information like borders and roads, not the distribution of a particular theme. A GPS is a navigation system, not a map type. So for emphasizing one thematic variable across an area, the thematic map is the best choice.