Gridded Environmental Data Compaction: An Investigation

Abstract

Both graphical examples and tabulated statistics clearly indicate that regional environmental gridded data may be compacted with either delta-type or double fast Fourier transforms, when the field data approximate values that are continuous in the first derivative. The smoother the original field values are, the more the data can be compacted. Results also show that fields derived from compacted fields can retain required accuracy. The Fourier transforms take twice as long as the delta schemes, but provide better results for light (2:1) compaction. The delta scheme is better than the Fourier transforms for heavy (7:1) compaction. The heavily compacted fields, however, may not be operationally useful. Keywords: Meteorological data, Oceanography, Data processing, Coastal regions.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1989
Accession Number
ADA210580

Entities

People

  • Harry D. Hamilton

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Classification
  • Coastal Regions
  • Coefficients
  • Errors
  • Fast Fourier Transforms
  • Grids
  • Information Science
  • Mainframe Computers
  • Ocean Basins
  • Precipitation
  • Regions
  • Sea Level
  • Security
  • Statistics
  • Thickness
  • Two Dimensional

Readers

  • Computational Modeling and Simulation
  • Geotechnical Engineering.
  • Neural Network Machine Learning.