Re: Special needs when reading netCDF4 files in NCL?

Bill,

NCL suppose to be able to handle multiple NetCDF4 files.
Could you please provide us two files so we can do a test?
I tried addfiles with two 64-bits offset files, and did not see
any problem.

Thanks,

Wei

-------
You can ftp larger datasets and files to:

ftp ftp.cgd.ucar.edu
anonymous
<use your email address for the password>
cd incoming
put ...
put ...
.
.
.
quit
Note that for security reasons, you cannot list the contents of this directory, and neither can we. We need to know the exact names of the files in order to retrieve them.

huangwei@ucar.edu
VETS/CISL
National Center for Atmospheric Research
P.O. Box 3000 (1850 Table Mesa Dr.)
Boulder, CO 80307-3000 USA
(303) 497-8924

On Mar 6, 2014, at 7:02 PM, "Capehart, William J" <William.Capehart@sdsmt.edu> wrote:

> Hi Wei
>
> Dennis send me something offline (recommending ) but I’m sending what I sent back to him w.r.t the troubleshooting to you…
>
> Email text is here:
>
> I spent this AM fighting with the code and was able to get a little
> traction but am still running into trouble.
>
>
> One thing I AM seeing is that when I include reading a variable and
> crunching on it (e.g., to do trivial unit conversions, we get
>
> For example:
> rainc = f->RAINC(0,:,:) / 25.4 ; (Time,
> south_north, west_east)
>
>
> Will earn a Segmentation Fault, but when we break it down into separate
> stepsŠ
>
> rainc = f->RAINC(0,:,:)
> rainc = rainc / 25.4
>
> ŠIt passes.
>
> We fixed that in our affected scripts and those patches are providing good
> results.
>
> But when we use addfiles(), the ‘plural' of addfile() we get a new
> segmentation fault that we cannot decode as soon as we input the data
> through:
>
> FOO = f[:]->BAR
>
> Or
>
> uvmetwrf3d = Wrf_user_getvar(f,”uvmet",-1)
>
> Any ideas here? Are multiple file reads not supported for HDF (netCDF4)
> files?
>
> Cheers and Thanks
> ================================================================
> Bill Capehart <William.Capehart@sdsmt.edu> Associate Professor
> Department of Atmospheric & Envir. Sciences AES PhD Coordinator
> 213 Mineral Industries Building Skype/EVO: wcapehart
> South Dakota School of Mines and Technology Ph: +1-605-394-1994
> 501 East Saint Joseph Street Fax: +1-605-394-6061
> Rapid City, SD 57701-3995 Mobile: +1-605-484-5692
> =================== http://capehart.sdsmt.edu ==================
>
>
>
>
> From: Wei Huang <huangwei@ucar.edu>
> Date: Thursday, March 6, 2014 at 09:14 MST
> To: William Capehart <William.Capehart@sdsmt.edu>
> Cc: Tabish Ansari <tabishumaransari@gmail.com>, "ncl-talk@ucar.edu" <ncl-talk@ucar.edu>
> Subject: Re: Special needs when reading netCDF4 files in NCL?
>
> Bill,
>
> For just reading, you do not need to use the setfileoption procedure,
> as NCL can detect and automatically read NetCDF3 or NetCDF4.
> But, for writing, that option will enforce NCL to write NetCDF4 file.
>
> Could you please provide us more details of the error message,
> or a sample file?
>
> Thanks,
>
> Wei
>
> huangwei@ucar.edu
> VETS/CISL
> National Center for Atmospheric Research
> P.O. Box 3000 (1850 Table Mesa Dr.)
> Boulder, CO 80307-3000 USA
> (303) 497-8924
>
>
>
>
>
>
> On Mar 6, 2014, at 9:05 AM, "Capehart, William J" <William.Capehart@sdsmt.edu> wrote:
>
>> I am indeed using 6.1.2.
>>
>> Bill
>>
>> From: Tabish Ansari <tabishumaransari@gmail.com>
>> Date: Thursday, March 6, 2014 at 06:37 MST
>> To: William Capehart <William.Capehart@sdsmt.edu>
>> Cc: "ncl-talk@ucar.edu" <ncl-talk@ucar.edu>
>> Subject: Re: Special needs when reading netCDF4 files in NCL?
>>
>> Start using NCL version 6.1.2
>>
>>
>> On 6 March 2014 11:36, Capehart, William J <William.Capehart@sdsmt.edu> wrote:
>>> I am having difficulty in applying the same NCL scripts I normally use for wrf output with netCDF3-type netcdf files and those with the netCDF4 option enabled.
>>>
>>> This comes through when doing seemingly simple operations using the addfile and addfiles (for multiple files). Segmentation faults begin to appear on reading netcdf4 variables. Are there any special considerations other than including the line…
>>>
>>> setfileoption("nc", "Format", "NetCDF4”).
>>> Thanks Much,
>>> ================================================================
>>> Bill Capehart <William.Capehart@sdsmt.edu> Associate Professor
>>> Department of Atmospheric & Envir. Sciences AES PhD Coordinator
>>> 213 Mineral Industries Building Skype/EVO: wcapehart
>>> South Dakota School of Mines and Technology Ph: +1-605-394-1994
>>> 501 East Saint Joseph Street Fax: +1-605-394-6061
>>> Rapid City, SD 57701-3995 Mobile: +1-605-484-5692
>>> =================== http://capehart.sdsmt.edu ==================
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>
>>
>> --
>> Thanks & Regards
>> Tabish Umar Ansari
>> MS Research Scholar
>> Environmental & Water Resources Engineering Division
>> Department of Civil Engineering
>> IIT Madras
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>

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Received on Thu Mar 6 21:52:23 2014