[R-sig-Geo] read the .nc file and obtain the vector data of a region

[hnstedu]

Hi, dear friend,
I have download the surface PM2.5 data provided in  NetCDF [.nc] file (http://fizz.phys.dal.ca/~atmos/martin/?page_id=140). 
My goal is to obtain the PM2.5 data of various provinces in China using this nc file. I know wo can employ the "ncdf4" package
to load the nc file in R. However, I have no idea to obtain the corresponding data of one region (e.g. China Provinces).
Any idea?


Thanks very much !


Bests,
wanhaiyou
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