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  3. Visualizing Geospatial Data in R

Exercise

Further down the rabbit hole

In the last exercise, the SpatialPolygonsDataFrame had a list of Polygons in its polygons slot, and each of those Polygons objects also had a Polygons slot. So, many polygons…but you aren't at the bottom of the hierarchy yet!

Let's take another look at the 169th element in the Polygons slot of countries_spdf. Run this code from the previous exercise:

one <- countries_spdf@polygons[[169]]
str(one, max.level = 2)

The Polygons slot has a list inside with 10 elements. What are these objects? Let's keep digging….

Instructions

100 XP
  • Call str() with max.level = 2 on the Polygons slot of one.
  • Call str() with max.level = 2 on the 6th element of the Polygons slot of one. Do you see something that looks like it might be spatial data?
  • Call plot() on the coords slot of the 6th element of the Polygons slot of one. Do you recognise what data this object contains?