Display a fixed map on a plot. This function predates the geom_sf()
framework and does not work with sf geometry columns as input. However,
it can be used in conjunction with geom_sf() layers and/or
coord_sf() (see examples).
annotation_map(map, ...)Data frame representing a map. See geom_map() for
details.
Other arguments used to modify visual parameters, such as
colour or fill.
if (FALSE) {
if (requireNamespace("maps", quietly = TRUE)) {
# location of cities in North Carolina
df <- data.frame(
name = c("Charlotte", "Raleigh", "Greensboro"),
lat = c(35.227, 35.772, 36.073),
long = c(-80.843, -78.639, -79.792)
)
p <- ggplot(df, aes(x = long, y = lat)) +
annotation_map(
map_data("state"),
fill = "antiquewhite", colour = "darkgrey"
) +
geom_point(color = "blue") +
geom_text(
aes(label = name),
hjust = 1.105, vjust = 1.05, color = "blue"
)
# use without coord_sf() is possible but not recommended
p + xlim(-84, -76) + ylim(34, 37.2)
if (requireNamespace("sf", quietly = TRUE)) {
# use with coord_sf() for appropriate projection
p +
coord_sf(
crs = st_crs(3347),
default_crs = st_crs(4326), # data is provided as long-lat
xlim = c(-84, -76),
ylim = c(34, 37.2)
)
# you can mix annotation_map() and geom_sf()
nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
p +
geom_sf(
data = nc, inherit.aes = FALSE,
fill = NA, color = "black", size = 0.1
) +
coord_sf(crs = st_crs(3347), default_crs = st_crs(4326))
}}}