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Exercise

Exploring Spatial Data

The data slot in shp holds a data frame like we are used to working with. However, since it is stored inside a SpatialPolygonsDataFrame, we access the data frame a little differently using the @ operator.

glimpse(shp@data) 

Observations: 808
Variables: 2
$ GEOID10 <fct> 27925, 28754, 28092...
$ ALAND10 <fct> 624688620, 223734670, 317180853 ...

Our data frame has 808 observations of two variables:

  1. GEOID10: the zip code of each polygon
  2. ALAND10: the area (square meters) of each polygon

Instructions 1/3

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  • 1

    Use the glimpse() function to look at the data slot of shp.

  • 2

    Print the class of the data slot of shp.

  • 3

    Print the GEOID10 variable.