GetPolygonBoundaries.RdGetPolygonBoundaries() returns the longitudinal and latitudinal points - coordinate pairs - that make up the boundary of the polygon.
GetPolygonBoundaries(my.polygon, labels)
| my.polygon | Either a SpatialPolygonsDataFrame data or a sf object. See |
|---|---|
| labels | A character vector of polygon boundary labels used to name each matrix |
my.polygon accepts a spatial object that contains a singular polygon (i.e. the boundary of the City of Chicago) or many polygons (i.e. a polygon for each the 77 Chicago community areas).
If my.polygon is of length 1, a matrix of coordinate pairs will be returned; otherwise, a list of labeled matrices, with each matrix representing the coordinate pairs that make the boundary of each particular polygon in my.polygon.
## SpatialPolygonsDataFrame, one polygon example ## ----- # load necessary data ---- data("city_boundary_spdf") # obtain boundaries for the City of Chicago ---- boundaries <- GetPolygonBoundaries(my.polygon = city_boundary_spdf) ## SpatialPolygonsDataFrame, multipolygon polygon example ## ----- # load necessary data ---- data("community_areas_spdf") # obtain boundaries for each of the 77 Chicago community areas ---- boundaries <- GetPolygonBoundaries(my.polygon = community_areas_spdf , labels = community_areas_spdf$community)#># load necessary data ---- data("city_boundary_sf") # obtain boundaries for the City of Chicago ---- boundaries <- GetPolygonBoundaries(my.polygon = city_boundary_sf)## sf, multipolygon example ## ----- # load necessary package ---- library(sf) # load necessary data ---- data("community_areas_sf") # obtain boundaries for each of the 77 Chicago community areas ---- boundaries <- GetPolygonBoundaries(my.polygon = community_areas_sf , labels = community_areas_sf$community)