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अभ्यास

Subsetting based on data attributes

Subsetting based on data attributes is a combination of creating a logical from the columns of your data frame and subsetting the Spatial___DataFrame object. This is similar to how you subset an ordinary data frame.

Create a logical from a column, let's say countries in Asia:

in_asia <- countries_spdf$region == "Asia"
in_asia

Then, use the logical to select rows of the Spatial___DataFrame object:

countries_spdf[in_asia, ]

Can you subset out New Zealand and plot it?

निर्देश

100 XP
  • Create a logical vector called is_nz that tests if the name column is equal to "New Zealand".
  • Create a new spatial object called nz by using is_nz to subset countries_spdf.
  • Plot nz.