base_map: Base Map

In Chrisjb/basemapR: Base Maps For ggplot2

Base Map

Description

fetches a basemap for our map based on the map's bounding box. Includes themes available at: https://leaflet-extras.github.io/leaflet-providers/preview/

Usage

base_map(bbox, increase_zoom = 0, basemap = "dark", nolabels = F)

Arguments

bbox	bounding box for out map extents generated using st_bbox() and expanded as necessary using expand_bbox(). Bounding box should be in lat/lng (epsg: 4326).
increase_zoom	the zoom is automatically calculated for the map but we can increase or decrease the zoom by setting an integer value.
basemap	the style of basemap to use. Currently supports 'dark', 'hydda', 'positron', 'voyager', 'wikimedia', 'mapnik', google, google-nobg, google-hybrid, google-terrain, google-satellite, google-road
nolabels	if TRUE, removes labels from the basemap. This is only available for some styles.

Value

a set of tiles to be added to a ggplot object.

Examples

# get bounding box for our map
library(sf)
bbox <- st_bbox(localauth_data)

# add to ggplot
library(ggplot2)
ggplot() +
  base_map(bbox, increase_zoom = 2, basemap = "google-terrain") +
  geom_sf(data = localauth_data, fill = NA) +
  coord_sf(xlim = c(bbox$xmin, bbox$xmax), ylim = c(bbox$ymin, bbox$ymax), crs = 4326)


# add straight to ggplot

ggplot() +
  base_map(st_bbox(localauth_data), increase_zoom = 2) +
  geom_sf(data = localauth_data, fill = NA)

Chrisjb/basemapR documentation built on April 1, 2022, 6:21 p.m.