Gridded Environmental Data Compaction: An Investigation
Final rept. Nov 1988-Apr 1989
ST SYSTEMS CORP MONTEREY CA
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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.