Open map List

Selection

In cartography, selection is a generalization operator that involves choosing specific geographic features to be included or omitted from a map based on scale, purpose, and relevance. It helps simplify the map while retaining essential information.

Basic

Introduction

Key Characteristics of Selection in Cartography:

  1. Determines Feature Importance – Only the most relevant features are retained at a given map scale.
  2. Scale-Dependent – The amount of detail shown depends on the map scale (e.g., a small-scale map may show only major cities, while a large-scale map includes all roads and landmarks).
  3. Improves Map Readability – Reduces clutter by eliminating unnecessary details.
  4. Can Be Thematic or Spatial – Features can be selected based on attribute data (e.g., population size) or spatial criteria (e.g., features within a boundary).

Explanation

Examples of Selection in Cartography:

  • City Maps – Only major roads and landmarks are shown, while minor streets are omitted.
  • Topographic Maps – Some smaller rivers or elevation points may be left out at smaller scales.
  • Thematic Maps – In an economic map, only cities above a certain population threshold might be displayed.
  • Political Maps – Small towns and villages might be removed to focus on major cities.

Outgoing relations