[gradsusr] CMIP5 and GrADS

[See Hai Ooi]

Dear Jennifer,
 
        If possible, can I have a whole suite of your stated scripts ?  I believe they can be of great help particularly to my analysis on remote-sensing data.
 
        Thank you and best regards.
 
Ooi
 


--- On Sat, 5/1/13, Jennifer Adams <jma at cola.iges.org> wrote:


From: Jennifer Adams <jma at cola.iges.org>
Subject: [gradsusr] CMIP5 and GrADS
To: "GrADS Users Forum" <gradsusr at gradsusr.org>
Date: Saturday, 5 January, 2013, 8:00 AM



Dear All, 
I will be giving a presentation at the AMS meeting next week on strategies I've used to download CMIP5 data. It's kind of a technical talk, maybe only of interest to a few members of this forum, but there is one slide that is relevant for GrADS (the text is below). I've done a bit of scripting to automatically generate descriptor files (for 'xdfopen' and 'open' when PDEF is necessary). The script parses the list of data files to determine the range of time steps for a particular variable and then generates the relevant CHSUB entries. It also does some other data-management checking to make sure the files cover a continuous, non-overlapping time span. Other functionality is listed below under the first bullet. I also have some code that will create PDEF files for non-rectilinear grids. ESMF's RegridWeightGen tool and a custom C program I wrote to translate the weights into a PDEF file make this a relatively easy job, allowing GrADS to handle a lot of
 data that were previously inaccessible. Although these scripts were all written for CMIP5 data, they can be adapted for other data sets. At some point, I'd like to bring some of this code under the hood of GrADS, but that is still a bit far off… In any case, please let me know if you are interested in any of my scripts -- it seems a shame to spend so much time developing code for only one person to use.
--Jennifer






•Create GrADS descriptor files
Aggregate files over time dimension
Make use of ensemble dimension when appropriate
Identify missing or overlapping time periods 
Assign non-standard dimensions 
   (e.g. basin averages or fixed fields)
Handle 365_day calendars
• Create PDEF files for non-rectilinear grids 
For ocean and sea ice realms
ESMF’s RegridWeightGen utility generates the
   interpolation weights
Vector fields must be rotated from grid-relative 
   to Earth-relative coordinates before interpolation





--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org




-----Inline Attachment Follows-----


_______________________________________________
gradsusr mailing list
gradsusr at gradsusr.org
http://gradsusr.org/mailman/listinfo/gradsusr
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20130104/d1c6361e/attachment-0003.html