[gradsusr] Problem about sdfopen CFSv2 forecast opendap data

[Jennifer M Adams]

The metadata provided by the THREDDS server isn’t sufficiently GrADS-friendly for sdfopen to work, but using the output from ncdump, you can construct a descriptor file:

dset https://www.ncei.noaa.gov/thredds/dodsC/cfs_v2_for_ts/2014/201408/20140828/2014082806/z850.01.2014082806.daily.grb2
dtype netcdf
options yrev
undef -9.99e8 missing_value
xdef 360 linear 0 1
ydef 181 linear -90 1
zdef 1 levels 850
tdef 1227 linear 12z28aug2014 6hr
vars 1
Geopotential_height_isobaric=>z850  1  t,z,y,x  Geopotential Height at 850mb [gpm]
endvars

Note: the definition of the Z axis could also be ‘zdef linear 0 1’ — it’s up to you which is more convenient.
—Jennifer

> On Sep 7, 2017, at 1:45 AM, Yen-Heng Lin <yheng at pie.com.tw> wrote:
> 
> Dear all,
> 
> I used to sdfopen CFSv2 opendap data from  nomads.ncdc.noaa.gov data server
> 
> After NOAA change the server to https://www.ncei.noaa.gov server, I can't sdfopen the files anymore. The error message is:
> 
> --
> Scanning self-describing file:  https://www.ncei.noaa.gov/thredds/dodsC/cfs_v2_for_ts/2014/201408/20140828/2014082806/z850.01.2014082806.daily.grb2
> SDF file has no discernable time coordinate -- using default values.
> gadsdf: SDF file does not have any non-coordinate variables.
> --
> 
> Does anyone have a solution about using sdfopen to open CFSv2 opendap data? 
> 
> 
> Thank you in advance
> Best Regards,
> Henry Lin
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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University