Why is data classification used in map design?

• A. Remove data to simplify.
• B. Group data into categories to improve readability and interpretation.
• C. Classification increases accuracy.
• D. Classification is only used for decorations.

Answer: (B)

Grouping data into categories is used in map design to make information easier to read and interpret. When values are placed into a few meaningful classes (like low, medium, high), readers can quickly spot where patterns or thresholds occur across the landscape. This approach reduces visual clutter and allows a clear, consistent legend, so people can compare areas at a glance and understand spatial relationships without getting lost in exact numbers. It also helps emphasize important distinctions, such as where a variable crosses a policy-relevant threshold. Keep in mind that classification changes how data is displayed rather than how accurate the data is; it’s about communicating information effectively, not improving measurement precision or adding decoration.