Open map List

Nominal Map

A nominal map is a type of thematic map that represents categorical (qualitative) data using different symbols, colors, or patterns to distinguish between features. It does not show numerical values or rankings but instead differentiates types, names, or classifications of spatial features.

Basic

Introduction

Key Characteristics of a Nominal Map:

  1. Represents Categorical Data – Uses names or labels rather than numerical values.
  2. No Ranking or Ordering – The categories are distinct but have no inherent order.
  3. Uses Colors, Symbols, or Patterns – Differentiates between features using qualitative symbology.
  4. Maintains Spatial Relationships – Shows locations and boundaries without implying magnitude or hierarchy.

Explanation

Importance of Nominal Maps in Cartography:

  • Helps in Classification & Identification – Used for organizing spatial features into meaningful groups.
  • Enhances Visual Interpretation – Easily distinguishes between different types of geographic features.
  • Supports Decision-Making – Useful in urban planning, environmental management, and resource allocation.

Comparison with Other Thematic Maps:

Map Type Data Type Example
Nominal Map Categorical (Qualitative) Land use, political boundaries
Ordinal Map Ordered Categories Soil erosion severity (low, medium, high)
Interval Map Continuous Data (No True Zero) Temperature (°C, °F)
Ratio Map Continuous Data (With True Zero) Population density, elevation

Examples

Examples of Nominal Maps:

  • Land Use Maps – Differentiate between residential, commercial, agricultural, and industrial zones.
  • Political Maps – Show country, state, or province boundaries.
  • Vegetation Maps – Categorize forest types (e.g., deciduous, evergreen, tropical).
  • Soil Type Maps – Display different soil classifications (e.g., clay, sand, loam).
  • Geological Maps – Indicate rock types (e.g., sedimentary, igneous, metamorphic).

Outgoing relations