[Met_help] [rt.rap.ucar.edu #48774] History for Error using NetCDF files

[RAL HelpDesk {for Paul Oldenburg}]

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  Initial Request
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Hello MET-Help!

I am contacting you because I am having difficulties when I attempt to run
various met-tools with NetCDF format files (I am using WRF output). When
using grib files, I seem to be able to run MET (specifically point-stat)
perfectly fine, however, when I use NetCDF format, MET cannot seem to find
the specific attributes in the file.

Example: Point_Stat
when using grib I use the following line in my config file to assign
attributes:

fcst_field[] = [ "TMP/P850" ];
> obs_field[]  = [ ];
>

This runs properly.

However, when using NetCDF, I use this:

fcst_field[] = [ "T(0,5,*,*)" ];
> obs_field[]  = [ "TMP/P850" ];
>

...and I receive the following error in the unix window:

Reading records for T(0,5,*,*).
> NetCDF: Attribute not found
>

My NetCDF file most definately has the variable "T" that has the following
dimensions: (1,26,141,126) or(time,level,x,y).

is there something I should be doing in order to read NetCDF files properly?

Thank you very much for any help!
-- 
Gavin D. Chensue
University of Michigan - College of Engineering
Dept. of Atmospheric Oceanic and Space Sciences
(734) 546-0725


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  Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #48774] Error using NetCDF files
From: Paul Oldenburg
Time: Wed Aug 03 14:33:42 2011

Gavin,

MET is only able to read a certain format of NetCDF file, specifically
the format that is generated by the MET tools
pcp_combine, ascii2nc and pb2nc.  I suspect that the NetCDF file that
you are attempting to use is the direct output of
WRF?  If so, this format of NetCDF cannot be read by MET because it is
on a staggered grid and on eta levels.  We
recommend that you post-process WRF output NetCDF files using the WRF
Post-Processor (WPP) or Unified Post-Processor
(UPP) to generate GRIB files.  The UPP tools can be downloaded here:

http://www.dtcenter.org/wrf-nmm/users/overview/upp_overview.php

If you have any questions, please let us know.

Thanks,

Paul


On 08/03/2011 02:26 PM, RAL HelpDesk {for Gavin Chensue} wrote:
>
> Wed Aug 03 14:26:56 2011: Request 48774 was acted upon.
> Transaction: Ticket created by gchensue at umich.edu
>        Queue: met_help
>      Subject: Error using NetCDF files
>        Owner: Nobody
>   Requestors: gchensue at umich.edu
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=48774 >
>
>
> Hello MET-Help!
>
> I am contacting you because I am having difficulties when I attempt
to run
> various met-tools with NetCDF format files (I am using WRF output).
When
> using grib files, I seem to be able to run MET (specifically point-
stat)
> perfectly fine, however, when I use NetCDF format, MET cannot seem
to find
> the specific attributes in the file.
>
> Example: Point_Stat
> when using grib I use the following line in my config file to assign
> attributes:
>
> fcst_field[] = [ "TMP/P850" ];
>> obs_field[]  = [ ];
>>
>
> This runs properly.
>
> However, when using NetCDF, I use this:
>
> fcst_field[] = [ "T(0,5,*,*)" ];
>> obs_field[]  = [ "TMP/P850" ];
>>
>
> ...and I receive the following error in the unix window:
>
> Reading records for T(0,5,*,*).
>> NetCDF: Attribute not found
>>
>
> My NetCDF file most definately has the variable "T" that has the
following
> dimensions: (1,26,141,126) or(time,level,x,y).
>
> is there something I should be doing in order to read NetCDF files
properly?
>
> Thank you very much for any help!


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