What is the method to integrate ggplot2 with autoplot.OpenStreetMap?

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To integrate ggplot2 with autoplot.OpenStreetMap, follow these steps:

1. Install and load the necessary packages:

install.packages("ggplot2")
install.packages("openstreetmap")
library(ggplot2)
library(openstreetmap)

1. Obtain a bounding box for the area you want to map using the get_bbox() function from the openstreetmap package:

bbox <- get_bbox(c(lon_min, lat_min), c(lon_max, lat_max), format_out = "bbox")

Replace lon_min, lat_min, lon_max, and lat_max with the longitude and latitude coordinates for the bottom left and top right corners of your desired map area.

1. Use get_map() from the ggmap package to download a map image:

map <- get_map(bbox, source = "osm")

1. Use autoplot() from the ggplot2 package and geom_tile() to plot the map:

ggmap(map) + 
  geom_tile(data = mapdata,
            aes(x = lon, y = lat, fill = value), alpha = .8) + 
  scale_fill_gradient(low = "white", high = "blue") +
  theme(legend.position = "bottom", plot.title = element_text(hjust = 0.5)) +
  ggtitle("My OpenStreetMap plot")

Assuming you have created a mapdata dataframe with suitable values for lon, lat, and value, this code will plot an OpenStreetMap image of your desired area with tiles overlaid to represent your data. If mapdata has no spatial attributes spatial coordinates can be added using a projection like st_transform() from the sf package.