Dear all,
I have a dataframe with around 90k observations over an area including a
continent (a raster object), and a variable of interest whose values I want to
visualize on a map. I have used levelplot function from lattice package to
visualize the data, and added a map of the continent to the plot as a layer
(using a shapefile). So far, so good.
My area of interest is the continent itself, but my data covers a larger area
(including the oceans around the continent). I would like to keep the whole map
but mask the ocean around the continent (with a buffer of 100km) and keep the
values only for the continent.
I would appreciate it if someone could help me achieve this.
Thank you in advance,
Sohrab
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