User's Guide: Interactive Graphics Computer Program for Contouring Randomly Spaced Data

Abstract

This report documents a computer program for contouring a set of nongridded (X, Y, Z) data points on a storage tube graphics terminal such as the Tektronix 4014 in the time-sharing environment. The program performs the contouring as follows: a. Determines the polygon (using the data points as vertices) which surrounds the data and forms the convex hull; b. Constructs a triangular mesh, using the data points as nodes, that falls inside the convex hull; c. Contours inside each triangle using one of three methods: (1) linear interpolation, (2) spline under tension, and (3) bivariant polynomial. This report also compares the results of this contouring program with an earlier version which uses a rectangular mesh concept. Some sample problems are also given.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1983
Accession Number
ADA135861

Entities

People

  • F. T. Tracy

Tags

DTIC Thesaurus Topics

  • Automatic
  • Classification
  • Computer Graphics
  • Computer Programs
  • Computer-Aided Design
  • Computers
  • Data Processing
  • Data Sets
  • Engineering
  • Engineers
  • Graphics
  • Interactive Graphics
  • Interpolation
  • Materials
  • Polynomials
  • Terminals
  • Waterways

Fields of Study

  • Computer science

Readers

  • Approximation Theory.
  • Graph Algorithms and Convex Optimization.
  • Instructional Design and Training Evaluation.

Technology Areas

  • Space