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‡a(MiU)990161178860106381
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‡asdr-miu.990161178860106381
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‡aMAIN
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‡aD 301.45/39:683
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‡aADA 082386
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‡aAFGL TR 79-263
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1 |
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‡aShapiro, Ralph.
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‡aLinear filtering on the surface of a sphere /
‡cRalph Shapiro.
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‡aHanscom AFB, Massachusetts :
‡bAir Force Geophysics Laboratory, Air Force Systems Command, United States Air Force,
‡c1979.
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‡a32 pages :
‡billustrations ;
‡c28 cm.
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‡atext
‡btxt
‡2rdacontent
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‡aunmediated
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‡aAFGL-TR ;
‡v79-263
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‡aEnvironmental Research Papers ;
‡vNo. 683
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‡aResearch supported by the Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, Hanscom AFB, Massachusetts.
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‡aMeteorology Division Project 2310.
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‡aADA082386 (from http://www.dtic.mil).
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‡a"29 October 1979."
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‡aIncludes bibliographical references (page 32).
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‡aAlthough methods of filtering have been developed for representing on a planar surface the sub-grid scale process of diffusion in numerical modeling of the atmosphere, the proper form of filtering for a spherical domain remains to be selected. In this study, the characteristics of several different forms of a highly scale dependent low pass filter are examined and compared for the case where the filter is applied to a scalar field on the surface of a sphere. The phase and amplitude response functions of the various forms of the filter indicate that the simplest form, although it does not preserve area-weighted mean values, approaches most closely the criteria established for the ideal filter. This indication is verified by the test computations in which each form of the filter is applied up to 10,000 times to a noisy scalar field. (Author).
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‡aMode of access: Internet.
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‡aSphere.
‡2fast
‡0(OCoLC)fst01129664
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‡aNumerical weather forecasting.
‡2fast
‡0(OCoLC)fst01041307
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⊔ |
7 |
‡aFilters (Mathematics)
‡2fast
‡0(OCoLC)fst00924327
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‡aDigital filters (Mathematics)
‡2fast
‡0(OCoLC)fst00893686
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‡aDiffusion.
‡2fast
‡0(OCoLC)fst00893534
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7 |
‡aAtmospheric models.
‡2fast
‡0(OCoLC)fst00820440
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‡aDiffusion.
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‡aAtmospheric models.
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0 |
‡aSphere.
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0 |
‡aDigital filters (Mathematics)
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650 |
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0 |
‡aFilters (Mathematics)
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0 |
‡aNumerical weather forecasting.
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‡aU.S. Air Force Geophysics Laboratory.
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‡aTechnical Report Archive & Image Library (TRAIL)
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