[gradsusr] Spatial Correlation

[Suman Maity]

Dear Latif
You can think the work in the following way:
1) Try to fix out the longitude and latitude of the two boxes viz., Box 1
(lon=x1,lon=x2, lat=y1,lat=y2) and Box 2 (lon=x3,lon=x3, lat=y3,lat=y4).
2) Now use maskout function in grads to extract the variable from the two
boxes; var_box1 and var_box2 (say)
3) Now apply normal formula of correlation on var_box1 and var_box2.

for masking you need some mask parameter in your dataset. Otherwise you can
take help of cdo. As of my understanding it can easily be done with cdo.
Hope this will help you.

Regards
Suman


********************************************************Suman Maity*
Research Scholar
Center for Ocean, Rivers, Atmosphere and Land Sciences(CORAL)
Indian Institute Of Technology Kharagpur.
******************************************************* *

_______________________________________________________________________________________________________
On Sat, Dec 26, 2015 at 11:09 PM, Muhammad Latif <latif.met at gmail.com>
wrote:

> Yes Kishore, the spatial resolution is same for both the datasets. But
> the function (scorr) you have mentioned is valid only for one box (I have
> four lat. and four lon. values, which are required to draw two boxes).
> Please share, If you have any idea.
>
> Thanks
>
> Regards
>
> On Sat, Dec 26, 2015 at 10:15 PM, Kishore Ragi <kishoreragi at gmail.com>
> wrote:
>
>> you need to have same resolution for both the datasets so that you can
>> calculate the spatial correlation as below
>>
>> open two datasets as 1 and two and invoke the following command
>>
>> scorr(*var.1, var.2*, lon=x1, lon=x2, lat=y1, lat=y2)
>>
>> hope this helps!
>>
>> Regards,
>> Kishore
>>
>>
>> *PhD student in climate science,*
>>
>> *National Institute of Technology, Rourkela,*
>>
>> *India- 769008*
>>
>>
>>
>>
>>
>>
>> *Phone: +91-8908671881
>> <%2B91-8908671881>http://www.researchgate.net/profile/Kishore_Ragi
>> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
>> <https://in.linkedin.com/in/kishoreragi>http://kishoreragi.webnode.com/
>> <http://kishoreragi.webnode.com/>*
>>
>> On Sat, Dec 26, 2015 at 10:18 PM, Muhammad Latif <latif.met at gmail.com>
>> wrote:
>>
>>> Hi Jeff, Let's suppose, I have two boxes on map 1 (Model) and similar on
>>> map 2 (Observation) of rainfall climatologies. I want to compute spatial
>>> correlation (scorr) between two maps, considering only the data within the
>>> defined boxes.
>>>
>>> Thanks
>>>
>>> On Sat, Dec 26, 2015 at 9:40 PM, Muhammad Latif <latif.met at gmail.com>
>>> wrote:
>>>
>>>> Thanks Jeff Duda, Would you please elaborate a bit more?
>>>>
>>>> Regards
>>>>
>>>> On Sat, Dec 26, 2015 at 9:26 PM, Jeff Duda <jeffduda319 at gmail.com>
>>>> wrote:
>>>>
>>>>> Create your fields such that they have empty boxes within them. Use
>>>>> maskout.
>>>>>
>>>>> Jeff Duda
>>>>>
>>>>> On Sat, Dec 26, 2015 at 9:28 AM, Muhammad Latif <latif.met at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi all Grads users,
>>>>>>
>>>>>> As, "scorr" function calculates the spatial correlation between two
>>>>>> variables over an X-Y domain, i.e. scorr(*expr1, expr2*, lon=0,
>>>>>> lon=360, lat=-90, lat=90). Is there any way to use this scorr
>>>>>> function when the domains are more than one (let's say, I have two boxes on
>>>>>> a single map)?
>>>>>>
>>>>>> Thank you
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> Latif
>>>>>>
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Jeff Duda
>>>>> Graduate research assistant
>>>>> University of Oklahoma School of Meteorology
>>>>> Center for Analysis and Prediction of Storms
>>>>>
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>>>>>
>>>>
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