OpenDAP GRIB Retrieval from Nomads

[Mike Bosilovich]

Hi Mark,

Your question reminded me of some new regridding functionality that
Arlindo told me about that I've been meaning to test drive. Looks like
you want grib files, but this can also do netcdf (and there maybe some
compressed netcdf too).

I run the following command line on my linux workstation with the
latest OpenGrads build installed

lats4d.sh -i http://nomad3.ncep.noaa.gov:9090/dods/reanalyses/reanalysis-2/6hr/flx/flx
-o testout2 -format grads_grib -time 00Z01OCT2009 00Z02OCT2009 -vars
cpratsfc pratesfc -merra0.5

This produces a grib file on my workstation for the convective and
total precip from R2  (I'll assume GFS's GDS will behave similarly).
for 5 6-hourly intervals for the time specified. the -merra0.5 flag
regrids the output to the MERRA reanalysis 1/2 degree native grid.
(this was just a test, I wouldn't regularly upscale coarser resolution
data that way)

This could be build into a csh script for looping. more variables can
be added, -lat and -lon can subset the domain, and -func could make
means or apply other grads functions. It slices, it dices.....

I hope this helps

Mike

On 11/11/09, Mark Hess <mhess at oceani.com> wrote:
> All,
>
> I tried to search the GRADSUSR archives for the answer to this question, but
> it gives me the error errno=146 "unable to initiate communication...".
> Perhaps you all can offer an answer.
>
> Does anyone have any sample strings for use with gradsdods to retreive a GFS
> grib file from the NWS NCEP MOMANDS OpenDAP server?
> (http://nomads.ncep.noaa.gov:9090/dods/gfs)
>
> I'm especially interested in how to extract data for a specified
> geographical region.
>
> If anyone can get me started with this, I should be able to take an example
> and work from there.
>
> Thank you.
>
> Mark
>