[gradsusr] GrADS help with NOMADS server

[Wesley Ebisuzaki - NOAA Federal]

Jeff,

I get the same error when trying

    sdfopen
https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z

from grads.  When I open

   https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z

from the browser,  I get

GrADS Data Server - info for /gfs_0p25/gfs20210603/gfs_0p25_00z : dds
<http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z.dds>
  das
<http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z.das>
------------------------------

*OPeNDAP/DODS Data URL:*
http://nomads.ncep.noaa.gov:80/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
*Description:*
GFS 0.25 deg starting from 00Z03jun2021, downloaded Jun 03 04:38 UTC
*Documentation:* (none provided)
*Longitude:*
0.00000000000°E to 359.75000000000°E
 (1440 points, avg. res. 0.25°)
*Latitude:*
-90.00000000000°N to 90.00000000000°N
 (721 points, avg. res. 0.25°)
*Altitude:*
1000.00000000000 to 0.01000000000
 (41 points, avg. res. 25.0)
*Time:*
00Z03JUN2021 to 00Z13JUN2021
 (81 points, avg. res. 0.125 days)
*Variables:*
*(total of 215)*
...

This shows that (1) the file is available, and (2) I am not being blocked
by the server.
The EMC person who would look at this problem has retired, so you should ask
the nomads help desk.

  https://nomads.ncep.noaa.gov/txt_descriptions/Help_Desk_doc.shtml

Wesley


On Thu, Jun 3, 2021 at 4:09 AM M.Mahakur <mmahakur at tropmet.res.in> wrote:

> Probably file(s) not available.
> Error.."nc_open failed to open file ...."!
>
> ------------------------------
> *From: *"Jeff Chabot" <jsc219 at gmail.com>
> *To: *"GrADS Users Forum" <gradsusr at gradsusr.org>
> *Sent: *Thursday, June 3, 2021 11:56:52 AM
> *Subject: *[gradsusr] GrADS help with NOMADS server
>
> I am running into two GrADS issues using sdfopen and NOMADS from NCEP.
>
> Issue 1:
>
> I am using GrADS to run some models for my website and just recently I
> have been running into this error:
>
> syntax error, unexpected WORD_STRING, expecting WORD_WORD
> context: Error { code = 0; message =
> "/gfs_0p25/gfs20210603/gfs_0p25_00z is not an available dataset"^;};
>
> I am using the following sdfopen command:
>
> sdfopen
> https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210603/gfs_0p25_00z
>
> I have been using that format for years, but just the past few days I
> have been receiving these errors.
>
> Issue 2:
>
> I believe that I am hitting the 120 connections limit despite adding
> code to adjust for this limit:
>
> I am now getting this error after defining one variable:
>
> define precip = apcpsfc/25.4
>
> gancgrid error: nc_get_vara_double failed; NetCDF: Malformed or
> inaccessible DAP DATADDS
> Data Request Error:  Error for variable 'apcpsfc'
>   Error ocurred at column 1
> DEFINE error:  Invalid expression.
> gancgrid error: nc_get_vara_double failed; NetCDF: Malformed or
> inaccessible DAP DATADDS
> Data Request Error:  Error for variable 'apcpsfc'
>   Error ocurred at column 1
> DEFINE error:  Invalid expression.
>
> I added a 60 second sleep command between variables to account for
> your April 20th changes and things worked for a while, and now the
> above error has returned.
>
> GrADS code added:
> say 'Sleep for 60 secs to Prevent Hitting 120 connection limit'
> '!sleep 60'
> say 'Continue Processing'
>
> Any ideas or suggestions on these issues?  I had things working after
> the April 20 NOMADS change, but since June, I have had these errors
> and my code has stopped working.
>
> P.S. Does anyone have sample code to check to see if sdfopen or define
> commands will work and if not tell GrADS to quit so it doesn't waste
> time creating blank maps?
>
> Thanks again,
>
>
> Jeff
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