suppressPackageStartupMessages(library(sf))
if (require(maps, quietly = TRUE)) {
m = map(xlim = c(4,9), ylim = c(48,55), fill = TRUE, plot = FALSE)
st_as_sf(m)
m = map(xlim = c(4,9), ylim = c(48,55), plot = FALSE)
st_as_sf(m, fill = FALSE)
st_as_sf(map(), fill = FALSE)
st_as_sf(map(fill = TRUE))
st_as_sf(map(), fill = FALSE, group = FALSE)
st_as_sf(map(fill = TRUE), group = FALSE)
}
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