Checksum value and file size. Google should be your friend:
https://en.wikipedia.org/wiki/Cksum
I did have in the past issues with cnvgrib built on Centos 6 and recent
Fedora's. Before going into this, let's eliminate simple causes.
On Tue, Apr 19, 2016 at 10:53 PM, Michelle Serino <mmserino@xxxxxxxx> wrote:
> I get:
>
> 942363691 228074 ruc2anl_130_20090605_2200_000.grb.
>
>
> What do those numbers represent? I am not familiar with the cksum command.
>
> Michelle M. Serino
> M.S. Candidate
> Texas A&M University
> Atmospheric Sciences Dept.
> Eller O&M, Suite 1017
> College Station, TX 77843
> (484) 769-0949
>
> On Tue, Apr 19, 2016 at 6:49 PM, George Trojan - NOAA Federal <
> george.trojan@xxxxxxxx> wrote:
>
>> Either the input file is corrupted, or your version of cnvgrib is bad.
>> Try this to eliminate the first possibility:
>>
>> $ cksum ruc2anl_130_20090605_2200_000.grb2
>> 492053148 21637412 ruc2anl_130_20090605_2200_000.grb2
>>
>> The numbers 492053148 21637412 should be the same.
>>
>>
>> On Tue, Apr 19, 2016 at 10:42 PM, Michelle Serino <mmserino@xxxxxxxx>
>> wrote:
>>
>>> When I do 'wgrib ruc2anl_130_20090605_2200_000.grb,' I get,
>>> '1:0:d=09060522:HGT:kpds5=7:kpds6=100:kpds7=1000:TR=1:P1=0:P2=0:TimeU=1:1000
>>> mb:anl:NAve=0,' and that is the only output. I am not sure exactly how
>>> to read that output and if that indicates that there is only one field.
>>>
>>> I got the length of the .grb file as only 228074 bytes: -rwxr-xr-x 1
>>> mserino 30490 228074 Apr 7 17:39 ruc2anl_130_20090605_2200_000.grb
>>>
>>> Michelle M. Serino
>>> M.S. Candidate
>>> Texas A&M University
>>> Atmospheric Sciences Dept.
>>> Eller O&M, Suite 1017
>>> College Station, TX 77843
>>> (484) 769-0949
>>>
>>> On Tue, Apr 19, 2016 at 6:00 PM, George Trojan - NOAA Federal <
>>> george.trojan@xxxxxxxx> wrote:
>>>
>>>> Does wgrib list only one field? I just ran convert on the same file.
>>>> There should be 317 data fields. What is the length of .grb file? I got
>>>> 65403248 bytes.
>>>>
>>>> George
>>>>
>>>> On Tue, Apr 19, 2016 at 9:31 PM, Michelle Serino <mmserino@xxxxxxxx>
>>>> wrote:
>>>>
>>>>> Thank you everyone for getting back to me.
>>>>>
>>>>> My apologies for not including the location of my data. I downloaded
>>>>> it from http://nomads.ncdc.noaa.gov/data/rucanl/ for the appropriate
>>>>> date and time. Let me respond to everyone's suggestions.
>>>>>
>>>>> 1. When I run:
>>>>>
>>>>> od -c ruc2anl_130_20090605_2200_000.grb | less
>>>>>
>>>>> I get output:
>>>>>
>>>>> 0000000 051107 041111 075003 000752 000000 001034 064407 100202
>>>>>
>>>>> 0000020 062007 164003 003011 013005 000400 000000 000001 000000
>>>>>
>>>>> 0000040 000025 000400 000000 000052 001777 141401 050401 037400
>>>>>
>>>>> 0000060 100631 135354 100410 014163 032000 000351 164464 040000, etc.
>>>>>
>>>>>
>>>>> 2. When I run:
>>>>>
>>>>>
>>>>> wgrib ruc2anl_130_20090605_2200_000.grb
>>>>>
>>>>>
>>>>> I get output:
>>>>>
>>>>>
>>>>> 1:0:d=09060522:HGT:kpds5=7:kpds6=100:kpds7=1000:TR=1:P1=0:P2=0:TimeU=1:1000
>>>>> mb:anl:NAve=0
>>>>>
>>>>> 3. When I run:
>>>>>
>>>>> wgrib -v ruc2anl_130_20090605_2200_000.grb
>>>>>
>>>>>
>>>>> I get similar output:
>>>>>
>>>>>
>>>>> 1:0:D=2009060522:HGT:1000 mb:kpds=7,100,1000:anl:winds in grid
>>>>> direction:"Geopotential height [gpm]
>>>>>
>>>>> 4. George, you mentioned that "It is possible that the program does
>>>>> not know about GRIB2 fields, specific to the office that created the
>>>>> file."
>>>>> By program, are you referring to the program I am using to process these
>>>>> data? Or are you referring to another program? I am not able to test the
>>>>> wgrib2 command at the moment because I do not have the permissions to
>>>>> install it (my advisor will have to do that).
>>>>>
>>>>>
>>>>> It appears that wgrib at least recognizes the *.grb file. Are the
>>>>> lists of the grids as they should be? Perhaps something small is getting
>>>>> lost in the conversion process that my processing code (using Warning
>>>>> Decision Support System - Integrated Information algorithms) cannot
>>>>> reconcile?
>>>>>
>>>>>
>>>>> Thank you for the continued help!
>>>>>
>>>>> Michelle
>>>>>
>>>>> Michelle M. Serino
>>>>> M.S. Candidate
>>>>> Texas A&M University
>>>>> Atmospheric Sciences Dept.
>>>>> Eller O&M, Suite 1017
>>>>> College Station, TX 77843
>>>>> (484) 769-0949
>>>>>
>>>>> On Mon, Apr 18, 2016 at 1:52 AM, Michael Dross <
>>>>> mdross@xxxxxxxxxxxxxxxxxx> wrote:
>>>>>
>>>>>> If you have wgrib installed do a
>>>>>>
>>>>>> wgrib -v ruc2anl_130_20090605_2200_000.grb
>>>>>>
>>>>>>
>>>>>> If it converted it correctly you should get a listing of the grids.
>>>>>> If not, something is amiss with the cnvgrib you have.
>>>>>>
>>>>>> - Mike
>>>>>>
>>>>>>
>>>>>> Sent from my iPad
>>>>>>
>>>>>> On Apr 17, 2016, at 9:11 PM, Michelle Serino <mmserino@xxxxxxxx>
>>>>>> wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I am using NCAR's cnvgrib utility to convert grib2 RUC-Analysis data
>>>>>> to grib1. An example of one of these data files is below:
>>>>>>
>>>>>> ruc2anl_130_20090605_2200_000.grb2
>>>>>>
>>>>>> When I run the command,
>>>>>>
>>>>>> cnvgrib
>>>>>> -g21 ruc2anl_130_20090605_2200_000.grb2 ruc2anl_130_20090605_2200_000.grb
>>>>>>
>>>>>> the converting process seems to work. I get a file with an extension
>>>>>> of "grb." However, while the file type is listed as a data file, it
>>>>>> appears green, as an executable file. In addition, the code I am using
>>>>>> does not recognize the file as a grb1 file. (The code only recognizes
>>>>>> grb1
>>>>>> files.) The website to which I referred to use this utility (
>>>>>> http://blog.nssl.noaa.gov/wdssii/) did not list any additional
>>>>>> options to use besides the required '-g21.' Am I missing something?
>>>>>> This
>>>>>> is my first implementation of the cnvgrib utility, so I apologize if I
>>>>>> have
>>>>>> made a naive mistake. I appreciate any help.
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>> Michelle Serino
>>>>>>
>>>>>> Michelle M. Serino
>>>>>> M.S. Candidate
>>>>>> Texas A&M University
>>>>>> Atmospheric Sciences Dept.
>>>>>> Eller O&M, Suite 1017
>>>>>> College Station, TX 77843
>>>>>> (484) 769-0949
>>>>>>
>>>>>> _______________________________________________
>>>>>> ldm-users mailing list
>>>>>> ldm-users@xxxxxxxxxxxxxxxx
>>>>>> For list information or to unsubscribe, visit:
>>>>>> http://www.unidata.ucar.edu/mailing_lists/
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
