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usage of @LOC along y-direction



Hi Ferret users,

I would like to find the location of first isotherm, say 2C between the
equator and 80S. To demonstrate clearly, 

Assume that the contours look like this

-------------------------- 2C ---------------- 60S (this is the location
I want to get)
-------------------------- 3C ---------------- 65S
-------------------------- 4C ----------------- 70S 
-------------------------- 3C ----------------- 75S
-------------------------- 2C ----------------- 80S (not this)

let iso2 = sst[y=80S:60S@LOC:2.0],

iso2 would return the location of the 2C from south to north, that I get
80S. 
Is there anyway that I can locate the first 2C isotherm from north to
south instead of south to north?

Thanks for your help,

Prasad










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