4.5 SLIDE Vectors Spatial Joining

• Spatial joins are implemented with st_join()

  • default - left join - all from x - left, including rows that DO NOT match y

    • inner join - set left=FALSE

  • default join for st_join() is st_intersects()

    • can change - set the join argument

      • (see ?st_join for details)
• Example Fig 4.6 - points join with the polygons that there are within
  • Random points on World map - join the Country name (polygon attribute) that the point is within
• non overlapping join example
  •  use the binary predicate st_is_within_distance()