[gradsusr] use GRACE satallite data in GrADS

[Bimal Gyawali]

Hi Jennifer,
Thank you very much for your information and advice. I will try those which
you have suggested. But I am new to writing codes and I only know grads. So
it will take time to work with this data. I wish if I can get codes from
anybody who has used this data and has codes.
Thank you.

*Bimal Gyawali*





* Graduate Research Assistant Department of Physical and Environment
Science Natural Resources Center Texas A&M University-Corpus Christi Corpus
Christi, TX 78412 Tel: 435-881-3603*

On Fri, Jul 8, 2016 at 9:05 AM, Jennifer M Adams <jadams21 at gmu.edu> wrote:

> Hi, Bimal —
> Well, I guess is it considerate of the GRACE data providers to tell you
> which months are missing, but it makes their data file unusable by GrADS in
> its current form. GrADS requires a linear time axis — the increment between
> each time step must be the same — and it looks like this file does not
> conform to that standard. It would have been better if they had simply
> padded their file with missing data for those months, but file size
> constraints can sometimes trump usability requirements.
>
> Your options are to use another tool that explicitly reads the time
> metadata for each time step and doesn’t care if the increments are
> different, or to break up your file into pieces (say one file per month)
> that can be aggregated together in a virtual way using templating (
> http://cola.gmu.edu/grads/gadoc/templates.html). GrADS will handle the
> missing months if you do it this way (one file per month, and some files
> missing), but it may be a bit of a chore to slice up your original file.
> The NetCDF operators (http://nco.sourceforge.net/) are pretty good at
> that job.
> —Jennifer
>
>
> On Jul 8, 2016, at 9:37 AM, Bimal Gyawali <bml.gya at gmail.com> wrote:
>
> Hi All,
> I would like analyze GRACE netcdf data using GrADS. when I do ncdump I
> found the following information. I am new to grads and I dont know how to
> handle with those kind of datasets. when I plotted time series the plot is
> only up to 2012. I dont know how to convert the time and skip those missing
> months.  Please can anyone help me with how to work with this data?
>  time:units = "days since 2002-01-01 00:00:00"
>   time_epoch = "2002-01-01 00:00:00" ;
>   time_start = " 107.5 days since epoch or 2002-04-18" ;
>   time_end = "5104.5 days since epoch or 2015-12-23" ;
>   months_missing =
> "2002-06;2002-07;2003-06;2011-01;2011-06;2012-05;2012-10;2013-03;2013-08;2013-09;2014-02;2014-12,2015-06"
> ;
> Thank you.
>
> *Bimal Gyawali*
>
>
>
>
>
> * Graduate Research Assistant Department of Physical and Environment
> Science Natural Resources Center Texas A&M University-Corpus Christi Corpus
> Christi, TX 78412 Tel: 435-881-3603 <435-881-3603>*
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
>
> _______________________________________________
> 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/20160708/300df4c0/attachment.html