INTAHILS: An Interactive Analytical Hill Shading System Using Entropy as an Information Statistic,

Abstract

The interactive computer mapping system, INTAHILS, allows the user to generate analytical shaded relief maps. Selected algorithms have been chosen to utilize Digital Terrain Matrix data and display the shaded relief image in a virtual map or softcopy format. Various commands are used to interactively edit or change the image by altering the illumination source angles in selected local areas of the map image. Specific topographic features may then be enhanced, resulting in a more informative visual impression of the terrain. The information statistic is measured numerically by calculating the entropy of the map information presented. The process thus allows for a maximization of information presented, while minimizing the subjective bias of the cartographer. Good man-machine communication principles were utilized, resulting in a convenient and user-friendly system.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA122693

Entities

People

  • Harold Moellering
  • Royal Webster

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Algorithms
  • Cartography
  • Computers
  • Earth Sciences
  • Elevation
  • Geographic Information Systems
  • Geography
  • Information Systems
  • Information Theory
  • Light Sources
  • Maps
  • Standards
  • Terrain
  • Topographic Maps
  • Uncertainty
  • Universities
  • Visual Inspection

Readers

  • Computer Science.
  • Computer Vision.
  • Team-Based Human-Centered Cognitive Task Decision Making and Information Performance.