library(tidyverse)
library(sf)
#> Linking to GEOS 3.13.0, GDAL 3.10.1, PROJ 9.5.1; sf_use_s2() is TRUE
library(spData)
#> To access larger datasets in this package, install the spDataLarge
#> package with: `install.packages('spDataLarge',
#> repos='https://nowosad.github.io/drat/', type='source')`
# You need the development version of sfnetworks:
# remotes::install_github("luukvdmeer/sfnetworks")
library(sfnetworks) # Exports st_duplicated
polygon = st_geometry(us_states)
pts_matrix <- st_coordinates(polygon)
pts_sfc <- st_multipoint(pts_matrix[, c(1, 2)]) |>
st_sfc(crs = st_crs(polygon)) |>
st_cast("POINT")
pts_dup <- st_duplicated(pts_sfc)
pts_interior <- pts_sfc[pts_dup]
plot(polygon, reset = FALSE)
points(pts_interior, cex = 1, pch = 16, col = 2)
Created on 2025-08-06 with reprex v2.1.1.9000
Session info
sessioninfo::session_info()
#> Warning in system2("quarto", "-V", stdout = TRUE, env = paste0("TMPDIR=", :
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#> setting value
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#> tz Europe/Rome
#> date 2025-08-06
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