Accession Number:

ADA159917

Title:

Representation of Topography in Spectral Models,

Descriptive Note:

Corporate Author:

AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA

Personal Author(s):

Report Date:

1985-09-23

Pagination or Media Count:

8.0

Abstract:

Various ways of representing topography that is a part of a global spectral model have been examined using the notions of error-in-synthesis and error-in-reproduction in measuring accuracy and fidelity. The trapezoidal and Gauss-Legendre quadratures are employed in conjuction with different truncations in the numerical computation of the transformations. The results have led to the following conclusions 1 The model terrain is best defined by the set of spectral coefficients in a truncation range tahat is commensurate with the model resolution 2 The model terrain in the real domain should be defined on the Gaussian latitudes as the transform of the spectral coefficients using the Gauss-Legendre quadrature 3 Smoothing by aspectral truncation alone is not suffiecient to insure the accuracy either in synthesis or in reproduction. Originator-supplied keyword Global circulation model.

Subject Categories:

  • Cartography and Aerial Photography
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE