Accession Number:

ADA210580

Title:

Gridded Environmental Data Compaction: An Investigation

Descriptive Note:

Final rept. Nov 1988-Apr 1989

Corporate Author:

ST SYSTEMS CORP MONTEREY CA

Personal Author(s):

• Hamilton, Harry D.

Report Date:

1989-05-01

Pagination or Media Count:

150.0

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 21 compaction. The delta scheme is better than the Fourier transforms for heavy 71 compaction. The heavily compacted fields, however, may not be operationally useful. Keywords Meteorological data, Oceanography, Data processing, Coastal regions.

Descriptors:

• *METEOROLOGICAL DATA
• *DATA COMPRESSION
• ENVIRONMENTS
• GRIDS
• STATISTICS
• ACCURACY
• TABULATION PROCESSES
• FOURIER TRANSFORMATION
• COMPACTING
• VALUE
• OCEANOGRAPHY
• DATA PROCESSING
• FAST FOURIER TRANSFORMS

Subject Categories:

• Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE