Re: obj_anal_ic

it seems this "obj_anal_ic" in v5.2 cannot recognize missing values.
the missing values in my station data is -999.9. after the calculation, some points have value like -997.
i change missing value to 1e+20, then the result is 9.99533e+19.


2010-11-17



flyyks



发件人： Dennis Shea
发送时间： 2010-07-06 19:10:02
收件人： "羘gel_G._Mu駉z"
抄送： ncl-talk
主题： Re: [ncl-talk] obj_anal_ic
 
OK ... I see the issue.
The v5.1.0 contributed.ncl had
http://www.ncl.ucar.edu/Document/Functions/Contributed/obj_anal_ic.shtml
This *NCL language* function was *slow* when a large number of values
were input. Hence, I replaced it with a fortran version.
The fortran had several additional features including the ability
to 'blend' different iterations. Likely, that is where the differences
occurred.
===
You can still use the original function by using the undocumented
function in contributed.ncl called
     function obj_anal_deprecated (....)
This is te original v5.1.0 version .... just a different name.
===
Also, you may wish to look at the Application URL "Random data to grid"
http://www.ncl.ucar.edu/Applications/rdm2grid.shtml
It shows several different interpolations.
===
Good luck
D
On 07/06/2010 11:33 AM, Mary Haley wrote:
> Hi,
>
> The obj_anal_ic routine wasn't available until version 5.2.0, so I'm
> not sure what you mean by using it in version 5.1.0.
>
> When you type "ncl -V" with the ncl that appears to be working, does
> it actually say "5.1.0"?
>
> --Mary
>
> On Jul 6, 2010, at 10:58 AM, Ángel G. Muñoz wrote:
>
>> Hi there
>>
>> Can anyone explain me what is the new algorithm for the
>> obj_anal_ic(_Wrap) function in version 5.2. I have been using the
>> one in 5.1.0 (which corresponds to a Cressman analysis) and there
>> are differences in the final output. I want to understand the new
>> methodology.
>>
>> Thanks
>>
>>
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--
======================================================
Dennis J. Shea tel: 303-497-1361 |
P.O. Box 3000 fax: 303-497-1333 |
Climate Analysis Section |
Climate & Global Dynamics Div. |
National Center for Atmospheric Research |
Boulder, CO 80307 |
USA email: shea 'at' ucar.edu |
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Received on Wed Nov 17 05:18:47 2010