[gradsusr] regrid data

[Robert Seigel]

Aha. I finally have it. regrid2 works perfectly now.

Thanks!
Rob

On 2/13/12 7:38 PM, Arlindo da Silva wrote:
> Sent from my iPhone
>
> On Feb 13, 2012, at 11:18 AM, Robert Seigel<rseigel at atmos.colostate.edu>  wrote:
>
>> Hi Liban, Sam, and Mike,
>>
>> Thank you for the responses.
>>
>> I am currently running opengrads 2.0.1 and still unable to access the regrid2 functions.
> I can help you with that but I'll need more information. For example,
> the output of
>
> ga->  q config
> ga->  q udxt
>
>    Arlindo
>
>
>> However, I have figured out a workaround using wgrib2. With wgrib2, I am successfully able to interpolate the NAM grid to the more coarse GFS grid for more objective comparisons.
>>
>> Thanks again,
>> Rob
>>
>> On Feb 12, 2012, at 4:12 PM, Michael Fiorino wrote:
>>
>>> Rob and Liban,
>>>
>>> the key point is that re2 and re are not grads scripts but grads
>>> external functions, i.e., they are external code accessed from within
>>> grads is if they were built into grads itself.  an example of an
>>> 'intrinsic' or built-in grads function is 'aave'.
>>>
>>> /*only opengrads2.0 supports external functions like my regrid2 (original
>>> user defined function for grads 1.X) that is now called 're2' in the
>>> opengrads2.0*/.
>>>
>>> let me know if you have problems Rob, but it should work if you use
>>> opengrads2.0.
>>>
>>> also, re2 (using re defaults) does 'appropriate' regriding.  the general
>>> practice is to use area-average regriding (perserves area averages, or
>>> what i call 'box averaging', the 'ba' option in re2/re) when regriding
>>> from fine to coarse grids (e.g., 0.5 deg ->  2.5 deg).  but for coarse ->
>>> fine Nth order interp is better (re2/re this is 3rd order bessel
>>> interpolation) re2/re selects the appropriate method that can be
>>> overridden as needed see:
>>>
>>> re:   http://opengrads.org/doc/udxt/re/
>>> re2:  http://ruc.noaa.gov/fiorino/grads/re2.txt
>>>
>>> ciao ciao 4 now, Mike
>>>
>>> On 2012-02-10 09:36, Yan Libin wrote:
>>>> Rob,
>>>>
>>>> You can download OpenGrADS from this link
>>>> http://sourceforge.net/projects/opengrads/files/grads2/2.0.1.oga.1/Linux/
>>>> I guess this bundle has regrid function (re2) after you install it.
>>>> It is not a script under windows platform, so maybe the same under linux platform.
>>>> After installation, you can do like this:
>>>>
>>>> define var1=re2(var,1,1)
>>>> d var1
>>>>
>>>> You can have a try.
>>>> Good luck.
>>>>
>>>> Libin
>>>> Yan Libin
>>>>
>>>> From: Robert Seigel
>>>> Date: 2012-02-11 00:28
>>>> To: zjuyanlibin; GrADS Users Forum
>>>> Subject: Re: [gradsusr] regrid data
>>>> I am using a Linux platform with grads-2.0.a9. Is there a linux script?
>>>>
>>>> Rob
>>>>
>>>> On Feb 10, 2012, at 9:26 AM, Yan Libin wrote:
>>>>
>>>>> If you are working on a windows platform, you can download OpenGrADS which has the regrid
>>> function already.
>>>>> Yan Libin
>>>>>
>>>>> From: Robert Seigel
>>>>> Date: 2012-02-11 00:22
>>>>> To: zjuyanlibin; GrADS Users Forum
>>>>> Subject: Re: [gradsusr] regrid data
>>>>> Thank you for the quick response, Yan.
>>>>>
>>>>> When I type that, I get the following response from grads:
>>>>>
>>>>> Syntax Error: Invalid Operand
>>>>> 're2' not a variable or function name
>>>>> Error ocurred at column 1
>>>>> DEFINE error: Invalid expression.
>>>>>
>>>>> Do you have a copy of the re2() script?
>>>>>
>>>>> Thanks,
>>>>> Rob
>>>>>
>>>>> On Feb 10, 2012, at 9:17 AM, Yan Libin wrote:
>>>>>
>>>>>> define varnew=re2(varold,1,1)
>>>>>>
>>>>>> Yan Libin
>>>>>>
>>>>>> From: Robert Seigel
>>>>>> Date: 2012-02-11 00:15
>>>>>> To: gradsusr
>>>>>> Subject: [gradsusr] regrid data
>>>>>> Hi,
>>>>>>
>>>>>> I am trying to regrid NAM data to match up with GFS resolution. I have seen numerous
>>> posts regarding regrid2() or re(), however I cannot seem to find any of these scripts. I
>>> have downloaded a bundle and found regrid2(), but could not get it to work. It gave me
>>> errors similar to previous posts ('regrid2' not a variable or function name). Does anyone
>>> have (or know where to find) a script that regrids data to a more coarse resolution?
>>>>>> Thanks,
>>>>>> Rob
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-- 
**********************************
Robert Seigel
Ph.D. Candidate
Department of Atmospheric Science
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