From: Malte Stuecker <malte.stuecker_at_nyahnyahspammersnyahnyah>

Date: Mon Mar 14 2011 - 12:17:20 MDT

Date: Mon Mar 14 2011 - 12:17:20 MDT

Hi everyone,

I have done EOF analysis for scalar fields (e.g. SST) with the NCL EOF

functions, however I am struggling with the concept of how to do an

EOF analysis of vector data (e.g. analyzing the u- and v- component of

ocean current data at the same time). I understand that it is possible

to represent both quantities as a complex number, however I am not

sure about the practical (=programming) approach. Most literature that

I found seems to cover only the theory, but there are not many 'HOW TO

DO' sources out there.

My idea was to just combine the u and v fields in one matrix along one

of the spatial axis (e.g. combining a u (20E-40E,20S-20N) and v field

(20E-40E,20S-20N) to a (20E-40E,40S-40N) field), calculate the EOF and

afterwards split the eigenvector matrix into the u- and v- component

and plot the resulting vectors. In this case, is it possible to

interpret the eigenvalues + eigenvectors in the same way as you would

doing an EOF analysis on a scalar field? It would be great if anyone

could point me to some step-by-step introduction to this type of

problem or knows maybe some software packages other than NCL that

could deal with this type of analysis comfortably.

Thank you very much in advance!

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Received on Mon Mar 14 12:17:30 2011

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