Re: ECMWF ds117.1 data reading

Hi Tianle,

In short, yes and yes. When using any of the spherical harmonics
functions, latitudes must be in ascending order. You can easily reverse
the latitudes by using the "::-1" syntax:

airt = a->2T(:,::-1,:)
Adam

Tianle Yuan wrote:
> Hi, Folks
>
> I need to read and convert temperature and specific humidity from the
> ERA40 ds.117.1 data set. There was a nice message on how to convert the
> 117.0 data by Dennis Shea:
>
> http://www.ncl.ucar.edu/Support/talk_archives/2006/0690.html
>
> It used the function 'g2fsh_Wrap' which requeires that latitude is in
> ascending order while the data in ds117.1 is organized in descending
> latitude order. Does it really matter?
>
> if so does a simple reverse of the data solve the problem?
>
> Thanks.
>
> TL
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Adam Phillips			             asphilli_at_ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000	  http://www.cgd.ucar.edu/cas/asphilli
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