[gradsusr] Cannot Contour Grid - all undefined values error

Tue Jun 6 15:47:04 EDT 2017

Bill,

After I downloaded the files:

bash-4.1$ ls p*grib2
pctile.2017060600.000_to_024hrs.grib2
pctile.2017060600.060_to_084hrs.grib2  pctile.2017060600.120_to_144hrs.grib2
pctile.2017060600.012_to_036hrs.grib2
pctile.2017060600.072_to_096hrs.grib2  pctile.2017060600.132_to_156hrs.grib2
pctile.2017060600.024_to_048hrs.grib2
pctile.2017060600.084_to_108hrs.grib2  pctile.2017060600.144_to_168hrs.grib2
pctile.2017060600.036_to_060hrs.grib2
pctile.2017060600.096_to_120hrs.grib2  pctile.2017060600.156_to_180hrs.grib2
pctile.2017060600.048_to_072hrs.grib2  pctile.2017060600.108_to_132hrs.grib2

cat p*grib2 >efi.grb2
g2ctl -b efi.grb2 >efi.ctl
gribmap -b -i efi.ctl
grads     it worked

Versions of the software   g2ctl 0.1.2  wgrib2 v0.2.0.6beta4
gribmap v2.0.1 grads v2.0.1  running under Redhat linux

Wesley

On Tue, Jun 6, 2017 at 3:15 PM, William Rasch - NOAA Federal <
william.rasch at noaa.gov> wrote:

> Jennifer and Wesley,
>
> Can't thank you guys enough for your help.  This is really great!!  But,
> I'm still having issues, however, I am very excited the Wesley was able to
> get
> something working so I have gone from thinking I'll never get this done to
> some hope now!!
>
> Wesley,  I'm really sorry, but I need even more specifics of how you did
> it.  Here is what I tried, please tell me where I have gone wrong...
>
> 1.)  I download ALL the pctile file from a certain date, in this case,
> ftp://ftp.cdc.noaa.gov/Public/gbates/reforecast2/efi_
> grib2/pctile.2017060600.000_to_024hrs.grib2
> all the way through the 156_180hrs files, so a total of 14 files (so not
> the efi* files, only the .pctile files).
>
> 2.)  I then cat all of these into a "master" file (this technique works
> for everything else I have done in the past).
> cat * > efi.master
>
> 3.)  Run g2ctl on that master file, but I used the -b command this time?
> Did I misunderstand that?
> g2ctl -b efi.master > efi.master.ctl
>
> 4.)  Then run gribmap with the -b command?
> g2ctl -b efi.master.ctl  (I have used -i in the past).
>
> 5.)  When I do the fifth step, I can a command line entry request of:
>  Enter Name of Data Descriptor file:   What do I enter there?  For this
> time I entered efi.master.ctl.
>
> With those steps I still get the undefined error.
>
> Can't thank you guys enough, really hope we can figure this out!!!!
>
> Bill
>
>
> On Tue, Jun 6, 2017 at 10:16 AM, Wesley Ebisuzaki - NOAA Federal <
> wesley.ebisuzaki at noaa.gov> wrote:
>
>> Bill,
>>
>> I had no problems plotting the efi* and pctile* files.  This is not to
>> brag
>> to to say that with a little more understanding, you can start making
>> plots!
>>
>> g2ctl is a simple program.  When you make a ctl file from a single grib
>> file,
>> it looks for the records with the earliest, second earliest and last time
>> stamp.  For example,
>>
>> earliest time stamp:   00Z jan 1 2017
>> next time stamp:        06Z jan 1 2017
>> last time stamp:         18Z jan 2 2017
>>
>> From these three time stamps, g2ctl knows
>>
>>    1) data starts at 00Z jan 1 2017
>>    2) dt=6 hours
>>    3) number of time steps = 8
>>        -> grads ctl file:  tdef 8 linear 00Z01jan2017 6hr
>>
>> If you have data at 07Z jan 1, 2017, gribmap will ignore it because it is
>> expecting data
>> every 6 hours.
>>
>> g2ctl needs to make a list of variables for the control file.  To save
>> time, g2ctl
>> makes the variable list from the first and second time steps.  If the 3rd
>> time step
>> and a new variable, g2ctl will not find it.  Since you are  combining
>> efi* and pctile*
>> files, this may have happened.
>>
>> The GrADS data model only has one time dimension.  For example,
>>
>>    default mode:    analysis at 00Z Jan 3 2017  has the same time as
>>                              24 hour forecast from 00Z Jan 2, 2017.
>>
>> To get around this problem, you have to be careful that g2ctl and gribmap
>> using the same time mode.  For your files,
>>
>> default:  (no option) use verification time (end of time average)
>> -0:          use start of forecast (initial time)
>> -b:          use start of time average
>>
>> For my test, I used the -b mode.
>>
>> When you make your files, you should either make
>>
>>     cat pctile.2017060200 <(201)%20706-0200>.* >pctile.2017060200
>> <(201)%20706-0200>.grib2
>> or
>>     cat pctile.*.000_to_024hrs.grib2 >pctile.000_to_024hrs.grib2
>>
>> Combining pctile and efi files is asking for trouble.
>>
>> Wesley Ebisuzaki
>>
>>
>> On Tue, Jun 6, 2017 at 11:50 AM, Jennifer M Adams <jadams21 at gmu.edu>
>> wrote:
>>
>>> There is no need to apologize for being a novice. You may find this doc
>>> page on how GrADS deals with GRIB data useful:
>>> http://cola.gmu.edu/grads/gadoc/grib.html
>>> Please see more comments inline.
>>>
>>>
>>> > On Jun 6, 2017, at 11:34 AM, William Rasch - NOAA Federal <
>>> william.rasch at noaa.gov> wrote:
>>> > I grabbed one of the files, only one, then cat'ed that to the
>>> efi.master
>>>
>>> I would haved run g2ctl on just the one file, before cat’ing it to
>>> efi.master.
>>>
>>> >
>>> > Ran:  g2ctl  efi.master.ctl
>>> >
>>> > Then, did a gribmap -v efi.master.ctl
>>> >
>>> > It then prompted me the "descriptor file", and I entered:
>>> efi.master.ctl
>>> >
>>> > The feedback from that was this:
>>>
>>> In general, it would be better to send the actual text instead of an
>>> image of it.
>>>
>>> >
>>> > <image.png>
>>> It doesn’t look you got a MATCH for any of the records in your file.
>>> What is in your descriptor file?
>>>
>>> —Jennifer
>>>
>>> >
>>> > I then tried to display tmp2m and got the same error.
>>> >
>>> > Thanks for any additional help and again, sorry for my incompetence
>>> with this.
>>> >
>>> > Bill
>>> >
>>> > On Mon, Jun 5, 2017 at 6:20 PM, Jennifer M Adams <jadams21 at gmu.edu>
>>> wrote:
>>> > Hi, Bill -
>>> > I find that the g2ctl output often needs a few tweaks to get
>>> evertyhing right and some variables need a fourth grib code in the units
>>> field in order to match properly. You also appear to be concatenating files
>>> with different time stamps and this may be confusing the issue. Try setting
>>> up your descriptor with only one file, and run gribmap in verbose mode
>>> (with the -v) and look at what is matching/not matching. If records don’t
>>> match what’s in your descriptor, gribmap will show you what the entry
>>> should contain. Once you are matching all the records in one file, then add
>>> the templating for multiple time steps. If it’s still not working please
>>> send your descriptor and the gribmap verbose output.
>>> > —Jennifer
>>> >
>>> >
>>> >
>>> > On Jun 5, 2017, at 11:33 AM, William Rasch - NOAA Federal <
>>> william.rasch at noaa.gov> wrote:
>>> >
>>> > > Hi,
>>> > >
>>> > > I have what would seem to be a very simple data-set and "variable"
>>> I'm trying to plot wiht GrADS.
>>> > >
>>> > > The grib files are located here...
>>> > >
>>> > > ftp://ftp.cdc.noaa.gov/Public/gbates/reforecast2/efi_grib2/p
>>> ctile.2017060500.000_to_024hrs.grib2
>>> > >
>>> > > I am simply downloading several of these files, then do this:
>>> > >
>>> > > cat * > efi.master
>>> > > g2ctl efi.master > efi.master.ctl
>>> > > gribmap -i efi.master.ctl
>>> > >
>>> > > I'm simply trying to plot either:
>>> > >
>>> > > temp2m
>>> > > wind10m
>>> > > apcpsfc
>>> > >
>>> > > When I try to display the data, I get the error:
>>> > >
>>> > > Cannot Contour Grid - all undefined values
>>> > >
>>> > > Thanks for any help....
>>> > >
>>> > > Bill
>>> > > _______________________________________________
>>> > > 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
>>> >
>>> >
>>> >
>>> > --
>>> >
>>> > William Rasch
>>> > Science and Operations Officer
>>> > Weather Forecast Office
>>> > Sacramento, CA
>>> > _______________________________________________
>>> > 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
>>>
>>
>>
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>
>
> --
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> William Rasch
> Science and Operations Officer
> Weather Forecast Office
> Sacramento, CA
>
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