When I run the code from the accepted answer (Plot coordinates on map), I get the following error message on the first run after installing ggmap:
# loading the required packages
library(ggplot2)
library(ggmap)
# creating a sample data.frame with your lat/lon points
lon <- c(-38.31,-35.5)
lat <- c(40.96, 37.5)
df <- as.data.frame(cbind(lon,lat))
# getting the map
mapgilbert <- get_map(location = c(lon = mean(df$lon), lat = mean(df$lat)), zoom = 4,
maptype = "satellite", scale = 2)
# plotting the map with some points on it
ggmap(mapgilbert) +
geom_point(data = df, aes(x = lon, y = lat, fill = "red", alpha = 0.8), size = 5, shape = 21) +
guides(fill=FALSE, alpha=FALSE, size=FALSE)
which gives the error:
Error: GeomRasterAnn was built with an incompatible version of ggproto. Please reinstall the package that provides this extension.
I tried installing ggproto, but the error is:
> Warning in install.packages :
package ‘ggproto’ is not available (for R version 3.3.2)
On subsequent attempts the error is:
Error: ggplot2 doesn't know how to deal with data of class ggmap/raster
I can plot the image using:
plot(mapgilbert)
I tried:
map2 <- get_map("Rotorua", zoom = 16)
ggmap(data = map2)
which returned the follow error message:
Error: ggplot2 doesn't know how to deal with data of class ggmap/raster
I just don't know R well enough to know where to look next for a solution -- have ensured all packages updated.
