Re: [ferret_users] Spatial Correlation;

[Karnan C <karnanc6@xxxxxxxxx>]

Thanks a lot,

I have combined all monthly data sets and made as time series.
But time details fall on M axis. Then I used "order=xyt", and now I
can generate spatial correlation.

Thank you.

2017-08-08 12:44 GMT+05:30, James Orr <James.Orr@xxxxxxxxxxxx>:
> Karnan,
>
> If yoru data is no a rectilinear grid, such as coads, use the 'regressxy' go
>
> script contributed by Andreas Schmittner:
>
> ! Use the LET command to define new variables
> ! Define the variable P as your independent (X) variable
> ! Define the variable Q as your   dependent (Y) variable
>
> go regressxy
>
> ! Results will be variables "SLOPE", "INTERCEP" and "RSQUARE"
>
> Jim
>
> On Tue, 8 Aug 2017, Manche Shivashankar wrote:
>
>> Dear Karnan,
>>
>> I have seen your .nc file, the data is two dimensional.
>> If you want to derive spatial correlation you need to have time series
>> data. Using the time series data the correlation
>> coefficients will be calculated.
>> With two dimensional data sets you can only derive the scatter plot at the
>> collocated points of the like wise parameters.
>>
>> Hope this will help you.
>>
>>
>> Regards
>> Shiva Shankar Manche
>> Scientists-SC
>> NRSC, Hyderabad.
>>
>>
>> On Mon, Aug 7, 2017 at 4:27 PM, Karnan C <karnanc6@xxxxxxxxx> wrote:
>>       Dear ferret users,
>>
>>       I tried to correlate chl data with sea surface height, for that I
>> set
>>       these two data sets in a common grid.
>>
>>       I followed the scripts mentioned in the page
>>
>> "http://ferret.pmel.noaa.gov/Ferret/faq/correlations-and-variances";.
>>       This method is working well for coads_climatology data.
>>
>>       use data coads_clim.nc
>>       let p=sst
>>       let q=airt
>>       go variance
>>       fill correl
>>
>>       But, not for my data. I can't understand the reason.
>>
>>
>>       use data relate.nc
>>       let p=ssh
>>       let q=chl
>>       go variance
>>       fill correl
>>
>>       (output shows 'no valid data')
>>       The sample data files attached here.
>>       Kindly help me.
>>       Thanks.
>>
>>
>>       --
>>       C. Karnan, CSIR - SRF
>>       Ph. D Research Scholar
>>       National Institute of Oceanography (CSIR)
>>       Regional Centre, Dr Salim Ali Road
>>       Kochi - 682 018.
>>       India.
>>       Mobile No. +91 9633032345; +91 9941811608
>>
>>
>>
>>
>
> --
> LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement
> CEA-CNRS-UVSQ
>
> LSCE/IPSL, CEA Saclay           http://www.ipsl.jussieu.fr/~jomce
> Bat. 712 - Orme                 mailto:  James.Orr@xxxxxxxxxxxx
> Point courrier 132
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>


-- 
C. Karnan, CSIR - SRF
Ph. D Research Scholar
National Institute of Oceanography (CSIR)
Regional Centre, Dr Salim Ali Road
Kochi - 682 018.
India.
Mobile No. +91 9633032345; +91 9941811608