NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Sampling theory for asynoptic satellite observations. I Space-time spectra, resolution, and aliasing. II - Fast Fourier synoptic mappingAn evaluation of the information content of asynoptic data taken in the form of nadir sonde and limb scan observations is presented, and a one-to-one correspondence is established between the alias-free data and twice-daily synoptic maps. Attention is given to space and time limitations of sampling and the orbital geometry is discussed. The sampling pattern is demonstrated to determine unique space-time spectra at all wavenumbers and frequencies. Spectral resolution and aliasing are explored, while restrictions on sampling and information content are defined. It is noted that irregular sampling at high latitudes produces spurious contamination effects. An Asynoptic Sampling Theorem is thereby formulated, as is a Synoptic Retrieval Theorem, in the second part of the article. In the latter, a procedure is developed for retrieving the unique correspondence between the asymptotic data and the synoptic maps. Applications examples are provided using data from the Nimbus-6 satellite.
Document ID
19830034722
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Salby, M. L.
(National Center for Atmospheric Research Boulder, CO, United States)
Date Acquired
August 11, 2013
Publication Date
November 1, 1982
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 39
Subject Category
Meteorology And Climatology
Accession Number
83A15940
Funding Number(s)
CONTRACT_GRANT: NASA ORDER L-9469-B
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available