Example: arcgeocoder and static maps
Combine arcgeocoder with sf and terra
Source:vignettes/articles/ex_static.Rmd
ex_static.RmdExample 1: sf objects
The following example shows how it is possible to create a nice static map with data retrieved with arcgeocoder and converting it to an sf object:
library(arcgeocoder)
library(dplyr)
library(sf) # spatial objects
library(ggplot2)
library(mapSpain) # sf objects of Spain
# McDonalds in Barcelona, Spain
mc <- arc_geo_multi("McDonalds",
city = "Barcelona",
region = "Catalonia", countrycode = "ES",
category = "Food", limit = 50,
custom_query = list(outFields = c("LongLabel", "Type,StAdd"))
)
# To sf
mc_sf <- st_as_sf(mc,
coords = c("lon", "lat"),
# here we have the wkid
crs = mc$latestWkid[1]
)
bcn <- esp_get_munic(munic = "Barcelona") %>%
st_transform(mc$latestWkid[1])
ggplot(bcn) +
geom_sf() +
geom_sf(data = mc_sf, color = "red")
# We can restrict the results to the bbox of BCN in the query
bbox <- st_bbox(bcn) %>% paste0(collapse = ",")
bbox
#> [1] "2.05362,41.32175,2.22717,41.46744"
mc2_sf <- arc_geo_multi("McDonalds",
city = "Barcelona",
region = "Catalonia", countrycode = "ES",
category = "Food", limit = 50,
custom_query = list(
outFields = c("LongLabel", "Type", "StAdd"),
searchExtent = bbox
)
) %>%
st_as_sf(coords = c("lon", "lat"), crs = mc$latestWkid[1])
ggplot(bcn) +
geom_sf() +
geom_sf(data = mc2_sf, color = "red")
Example 2: terra objects
We can add static map tiles thanks to maptiles package and tidyterra for plotting. The tiles themselves are represented here as terra objects:
library(maptiles)
library(tidyterra)
# Usually use crs 3857 for getting tiles
bcn_3857 <- st_transform(bcn, 3857)
osm_tiles <- get_tiles(bcn_3857, provider = "CartoDB.Positron", crop = TRUE)
ggplot() +
geom_spatraster_rgb(data = osm_tiles, maxcell = Inf) +
geom_sf(data = bcn, fill = NA, color = "black", linewidth = 1) +
geom_sf(data = mc2_sf, color = "red") +
coord_sf(crs = 3857) +
labs(caption = "(c) OpenStreetMap contributors, (c) CARTO")
Session info
Details
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