[gradsusr] extract data from a set of coordinates

[maria elena bravo gasca]

I need to extract data from a set of coordinates, for example:

lat       lon
30       -86
30.5    -86.5
31       -87
...         ...
n           n

only these coordinates of a set of global data

as I can do?

Help, I'm new!

Mary, from México

:)
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