Re: data format quesiton

From: Saji N. Hameed <saji_at_nyahnyahspammersnyahnyah>
Date: Thu, 12 Jan 2006 15:38:25 -1000 (HST)


Since I am also a GraDs-turned-NCL user, this issue is of much interest to
me. Recently for some analysis I had to convert a lot of data (that was
designed for use in GrADs) to netcdf format, I did some playing around
using GrADs itself, shell script and NCL. My approach may not directly
solve your problem, but I hope it is of some use.

Specifically using a Grads script I read the data and output information
necessary to create NetCDF data. NCL could then read this ascii 'info'
file and parse it to create the necessary metadata for use in NCL.

* WARNING * The following method is very specific and may not suit you.

I am attaching three scripts for your reference -

         o - A Grads script that may output necessary info to
                     create MetaData. Since I also had to byteswap my
                     data, the script also writes out the original data.
                     You may not need this.

                      Example usage: grads -cl 'run varxyz'
                                 assumes you have a file named "varxyz".ctl
                                 and the variable inside is called "varxyz"
                                 "varxyz" can be any string, for example

                         Sample Output: - Information needed to
                                                     create Metadata
                                          sst.bin - byteswapped data

         o bin2nc.ncl - this is a very specific script, so it may not
                         suit you. But it may give you some idea of how
                         to use the information inside say to
                         create Metadata for the variable sst. The script
                         creates time information assuming the resolution
                         is daily (this may need to be modified).

         o - a shell script to automate the usage of bin2nc.ncl.
                         May be helpful if you have many files to convert
                         to netcdf.

           For example to convert data specified by sst.ctl into netcdf,
one can give the following series of comments.

                 1. grads -bcl 'run sst'
                 2. bin2nc:sst

Hope it helps.


Saji N. Hameed
Assistant Researcher
International Pacific Research Center, Tel: +1808 9569534
2525 Correa Road, Honolulu, HI 96822 Fax: +1808 9569425

On Thu, 12 Jan 2006, Kate Young wrote:

> Can you please tell me if NCL supports either Vis5d or GrADS formats?
> _______________________________________________
> ncl-talk mailing list

ncl-talk mailing list

Received on Thu Jan 12 2006 - 18:38:25 MST

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