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Re: Code to convert grib spherical harmonic coefficients to gridded lat/lon [message #56982]

Thu, 29 November 2007 14:41

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<30b87d0d-e14a-4c09-abca-31ed7971fa23@g30g2000hsb.googlegroups.com>,
Bill Gallery <wgallery@aer.com> wrote:

> I have some ECMWF grib files where the data is stored as spherical
> harmonics. Does anyone have idl code to convert the coefficients to
> gridded (lat/lon) data? Alternatively, do you have other programs to
> dump the data from the grib file, convert the spherical harmonics, and
> write it out? (I know there is a lot of stuff out there to handle
> grib files [ncl_convert2nc, wgrib, emos, PyNIO, ..] but I need someone
> with real experience to sort it out.

The do-it-yourself approach is to use SPHEREPACK from NCAR

http://www.cisl.ucar.edu/softlib/SPHERE.html

You will have to figure out how to read the GRIB files also.
The wgrib utility can be used to convert the GRIB files to
plain binary files. The wgrib pages have some good examples
of how to extract a particular field from a GRIB file.

Ken Bowman

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[Message index]

		Re: Code to convert grib spherical harmonic coefficients to gridded lat/lon By: Kenneth P. Bowman on Thu, 29 November 2007 14:41
		Re: Code to convert grib spherical harmonic coefficients to gridded lat/lon By: Jim Pendleton, ITT Vi on Fri, 30 November 2007 08:40
		Re: Code to convert grib spherical harmonic coefficients to gridded lat/lon By: wgallery on Fri, 30 November 2007 06:34

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