[CF-metadata] Gaussian Lat/Lon grids

[John Caron]

Hi Karl:

Is there a standard way that the latitude bounds should be calculated that reflects the gaussian?

If I do include the weights, sounds like I should include a description of how they were calculated. I used "the roots of the ordinary Legendre polynomial of degree NLAT using Newton's iteration method". Does that seem sufficient and useful?

BTW, it appears you didnt send to list, so i forwarded.

Karl Taylor wrote:
> Dear John,
> 
> I think that CF doesn't bother identifying gaussian grids or weights as 
> such, but simply stores the latitude values and the latitude bounds. 
> This avoids the problem that there is no unique way of defining weights 
> for a given spherical harmonic truncation (although conventionally 
> nearly everyone does this in the same way).
> 
> I hope someone will correct me if I've said anything incorrect.
> 
> cheers,
> Karl
> 
> John Caron wrote:
>> I dont see a standard for encoding gaussian weights for a gaussian 
>> Latitude grid (eg GRIB GDS type 4 "Gaussian Lat/Lon"). Does this seem 
>> needed? If so, any suggestions?
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