[Met_help] If I want to use precip files....?

[John Halley Gotway]

Erik,

Good luck with your upcoming defense.

Generally speaking, the Grid-Stat and MODE tools in MET may be used to compare any two gridded fields that are in GRIB format or the NetCDF format MET expects.  So from a technical standpoint, you 
could certainly compare your model output to reanalysis data - which I believe is available GRIB format.

 From a scientific standpoint, as to whether or not that's a worthwhile thing to do, I can't provide much advice.  In MET we're trying to provide a set of verification tools that's as flexible as 
possible.  Exactly how you use them though is up to you.

John

Erik Noble wrote:
> This will be of great help.......Thank you!
> 
> John, I have not been able to fully do the tutorial because I have to defend
> my thesis proposal in 12 days. My time with it has been sporadic.
> 
> Does one need precip files in order to verify other variables in the WRF
> model like wind or temps? Can a user use reanalaysis with MET to verify a
> model?
> -Erik 
> 
> 
> On 7/14/08 3:08 PM, "John Halley Gotway" <johnhg at rap.ucar.edu> wrote:
> 
>> Erik,
>>
>> I apologize for the delay in getting back to you.  Last week and this week
>> have been very busy getting the next release of MET ready and getting ready
>> for the WRF-Tutorial.
>>
>> Regarding precip data outside the US, I searched through the previous MET Help
>> emails, and did find someone with a problem very similar to yours.  He was
>> trying to use CMORPH precip satellite data
>> with MET.  I've emailed him to find out if he'd be willing to provide you with
>> some basic instructions on how he went about doing it.  Perhaps one of you
>> could provide me with some information I could
>> post to the MET website describing how to use CMORPH data.
>>
>> I'll let you know when I hear back from him.
>>
>> John
>>
>> Erik Noble wrote:
>>> Dear John, has anyone else used Met with precip data to verify models
>>> simulations outside of the united states?
>>>
>>> i am still getting stuck on finding precipitation data in Grib format
>>> and the conversion to Netcdf.
>>> -Erik
>>>
>>> On Tue, Jul 8, 2008 at 4:02 PM, John Halley Gotway <johnhg at rap.ucar.edu>
>>> wrote:
>>>> Erik,
>>>>
>>>> If you have the precip in NetCDF, we'd need to do a few things:
>>>> (1) Make sure that the precip fields are named APCP to match the GRIB code
>>>> abbreviation for accumulated precip.  And ensure that the units are in "mm"
>>>> which is the prescribed unit for APCP.
>>>> (2) Add variable attributes to the APCP variable to match the attributes
>>>> that are included for the variables created by the PCP-Combine tool.
>>>> (3) Add global attributes defining the grid on which the data resides.
>>>>
>>>> In future releases of MET we hope to more generally support the NetCDF CF
>>>> convention.  Then we could at least remove the variable name requirement.
>>>>  But as MET currently stands (for version 1.1), you'd need to set it up as
>>>> listed above.
>>>>
>>>> John
>>>>
>>>> Erik Noble wrote:
>>>>> Dear John,
>>>>> I have asked for this data in GRIB but no response.
>>>>>
>>>>> "I could help you set up the format for the NetCDF files so that MET
>>>>> would be able to read it."
>>>>> What do I need to do once i provide you an netcdf file?
>>>>> -Erik
>>>>>
>>>>> On Thu, Jul 3, 2008 at 1:52 AM, John Halley Gotway <johnhg at rap.ucar.edu>
>>>>> wrote:
>>>>>> Erik,
>>>>>>
>>>>>> I'm sorry, I'm not familiar with global precip analyses in GRIB.  I know
>>>>>> that StageII and StageIV precip analyses are available in GRIB format.
>>>>>>  I'd
>>>>>> refer you to Lacey Holland on this but she recently left NCAR for a new
>>>>>> job.
>>>>>>
>>>>>> I would guess that there would be HDF -> NetCDF converters out there.
>>>>>>
>>>>>> If you do find a good source for this data in GRIB, let me know and I can
>>>>>> add a link to it on the MET website.
>>>>>>
>>>>>> John
>>>>>>
>>>>>> Erik Noble wrote:
>>>>>>> Maybe you know more about this than me......
>>>>>>> What global precipitation data  is available in GRIB already? All the
>>>>>>> ones I encounter are ither binary or HDF format.
>>>>>>> -Erik
>>>>>>>
>>>>>>> On Wed, Jul 2, 2008 at 11:51 AM, John Halley Gotway
>>>>>>> <johnhg at rap.ucar.edu>
>>>>>>> wrote:
>>>>>>>> Erik,
>>>>>>>>
>>>>>>>> For use with MET, the easiest thing would be to get the data into GRIB1
>>>>>>>> format.  Then you'd be able to use it directly in MET.
>>>>>>>>
>>>>>>>> If that's too difficult, you could get it into NetCDF format, and I
>>>>>>>> could
>>>>>>>> help you set up the format for the NetCDF files so that MET would be
>>>>>>>> able
>>>>>>>> to
>>>>>>>> read it.  In future releases of MET, we hope to more fully support the
>>>>>>>> NetCDF CF conventions.  For the current release though, we'd just need
>>>>>>>> to
>>>>>>>> make your NetCDF file look like the output of the PCP-Combine tool (in
>>>>>>>> MET).
>>>>>>>>  Then the stats tools would be able to read the NetCDF file.
>>>>>>>>
>>>>>>>> John
>>>>>>>>
>>>>>>>> Erik Noble wrote:
>>>>>>>>> Dear MET help,
>>>>>>>>> If I have access to precipitation observation data that is only
>>>>>>>>> available in binary, can I still use it with MET.
>>>>>>>>> This site says that it has a fortran code that I can use to "read" the
>>>>>>>>> data, but I ahve to figure out what format I want the output in.
>>>>>>>>>
>>>>>>>>> What do I need to do in oder to use it with MET?
>>>>>>>>> -Erik
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ---------- Forwarded message ----------
>>>>>>>>> From: Gareth Berry <gareth at atmos.albany.edu>
>>>>>>>>> Date: Mon, Jun 30, 2008 at 4:39 PM
>>>>>>>>> Subject: Re: WAF submission
>>>>>>>>> To: enoble at giss.nasa.gov
>>>>>>>>> Cc: chris at atmos.albany.edu
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Hi Erik,
>>>>>>>>>
>>>>>>>>> Chris asked me to reply to you about the cmorph data.
>>>>>>>>>
>>>>>>>>> The data is in a binary format, there is fortran code in the readme
>>>>>>>>> file that you can use to read it
>>>>>>>>> and export to your favourite data format (netcdf etc).
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ftp://ftp.cpc.ncep.noaa.gov/precip/global_CMORPH/3-hourly_025deg/README
>>>>>>>>> .cmorph.025deg_3-hourly
>>>>>>>>>
>>>>>>>>> Cheers,
>>>>>>>>>
>>>>>>>>> Gareth.
>>>>>>>>> _______________________________________________
>>>>>>>>> Met_help mailing list
>>>>>>>>> Met_help at mailman.ucar.edu
>>>>>>>>> http://mailman.ucar.edu/mailman/listinfo/met_help
>