Open map List

Simplify

In cartography, simplify is a generalization operator that reduces the complexity of geometric shapes while preserving their essential form. It is used to improve map readability and performance by removing unnecessary details from lines, boundaries, and polygons, especially at smaller scales.

Basic

Introduction

Key Characteristics of Simplification in Cartography:

  1. Reduces Detail While Retaining Shape – Maintains the general structure of features while eliminating minor variations.
  2. Scale-Dependent – More simplification is applied at small scales, where excessive detail would clutter the map.
  3. Improves Map Legibility – Helps users focus on major geographic patterns rather than excessive detail.
  4. Applied to Different Features:
    • Lines – Simplifying coastlines, rivers, and roads by reducing small bends and fluctuations.
    • Polygons – Generalizing borders, lakes, or land-use areas while maintaining recognizable shapes.

Explanation

Methods of Simplification:

  1. Douglas-Peucker Algorithm – Removes points along a line while keeping the overall shape.
  2. Visvalingam-Whyatt Algorithm – Prioritizes point removal based on visual significance.
  3. Topology-Preserving Simplification – Ensures connected features (e.g., road networks) remain intact.

Examples

Examples of Simplification in Cartography:

  • Coastlines & Rivers – Removing small inlets and meanders for smoother representation at small scales.
  • Political Boundaries – Reducing jagged edges while maintaining recognizable country or state shapes.
  • Road Networks – Eliminating minor curves and unnecessary intersections in transportation maps.
  • Contour Lines in Topographic Maps – Smoothing elevation contours to prevent clutter.

Outgoing relations