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Gauss2lats

23 Oct 2002 (Updated 23 Oct 2003)

No BSD License

Estimates the latitudes of a Gaussian grid.

File Information

Description

Spectral atmospheric models provide data on a Gaussian grid that has regular longitude spacing but irregular latitude spacing. Gauss2lats provides the latitudes for such data. This information is needed, for example, when making a contour map.

The function determines the Gaussian latitudes by finding the roots of the ordinary Legendre polynomial of degree NLAT using Newton's iteration method. The only input required is the number of latitude lines in the Gaussian grid. The outputs are Gaussian latitudes, latitude spacing, and cosine of latitude.

MATLAB release

MATLAB 6.1 (R12.1)

Other requirements

The code has been tested and runs satisfactorily on an IBM PC and G4 Mac. Compares to within 13 decimal places of results from a Cray J90.

Tags for This File
Everyone's Tags	gaussian grid, gaussian latitude, gcm, spectral model
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Updates
24 Oct 2002	Correction to typing error in the comments section of the .m file. Plus correction to error in description
23 Oct 2003	Comments in code and limitations changed following improved estimate of accuracy by Lee Panetta (21.10.2003).

Tag Activity for this File
Tag	Applied By	Date/Time
gaussian grid	Tom Holt	22 Oct 2008 06:53:06
gaussian latitude	Tom Holt	22 Oct 2008 06:53:06
gcm	Tom Holt	22 Oct 2008 06:53:06
spectral model	Tom Holt	22 Oct 2008 06:53:06

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