I am confused on how to generate spatial grid data frames with attribute
data and I've come across many different methods. I am ultimately trying
to extract temperature data from the CRU 3.1 data set for cropped areas
globally. I have both the CRU data and the cropped area dataset (Monfreda)
in NetCDF. I have the lon/lat vectors as well as a matrix of 1 timestep of
the temperature data, and the same for the cropped area. The main issue is
that these two sets are of different resolution. The crop data are 5
minute, the temp is 1 degree. My thought was to either extract the
temperature values at each cell in the crop data set with a value > 0, then
extract this to the country level using the appropriate shapefile. Any
guidance on where to start would be much appreciated.
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Jordan R Winkler
Teaching Fellow / PhD Candidate
Dept. of Geography and Environment
Boston University
675 Commonwealth Avenue, STO 338
Boston, MA 02215
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