Re: Reading GRIB ECMWF spherical harmonic data

From: David Ian Brown <dbrown_at_nyahnyahspammersnyahnyah>
Date: Wed, 19 Jul 2006 13:28:09 -0600

Hi Jim,
PyNIO does not modify the spherical harmonic data, change its type or
anything like that. We believe it unpacks
the data properly and separates the real and imaginary components into
individual slices that are presented
as another data dimension to the right of the grid dimensions.
If you think your data on the T511 grid is being unpacked improperly,
can you send us an example data file
for us to test?

Upload instructions:
Name: anonymous
Password: <your email address>
cd incoming
put <file>

Let us know when the file has been uploaded and its name.
We can get the file only if we know the name.


On Jul 17, 2006, at 5:03 PM, James Boyle wrote:

> I am having a bit of trouble in working with some data that is from
> the ECMWF.
> The data are in spherical harmonics ( T511), not ERA40.
> My question concerns PyNIO - I just want to make sure that Nio does
> not do anything to the data when reading it from the file.
> for example :Does the double precision data remain double ?
> My concern is that all the examples appear to be gridded data, and Nio
> might be 'helpful' in a bad sense for the spherical harmonic data.
> Thanks for any help.
> --Jim
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Received on Wed Jul 19 2006 - 13:28:09 MDT

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