[gradsusr] Spatial standard deviation

[David Nielsen]

​Hi everyone,

I have some scalar variables gridded data, such as SST, and I intend to
calculate its standard deviation in a certain area. ​

I have seen some reference to use formulas similar to this one:

define sdsst=sqrt(ave(pow(ave(sst,t=1,t=12)-sst,2),t=1,t=12))

However, the above formula calculates the temporal standard deviation of
SST, between t=1 and t=12. What I intend to do is, to a given area,
calculate its standard deviation for each value of t. In other words, I
want to know the amplitude of the variation of SST where 90% of the data is
found (one sigma), within a certain area, for each t.

Would anyone have any suggestions?

Thanks in advance!



-- 
David Marcolino Nielsen
Engenharia de Recursos Hídricos e do Meio Ambiente
Universidade Federal Fluminense
davidnielsen at id.uff.br
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