ggplot not plotting ggmap object

Question

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.

Amazonite

1st map: ggmap(mapgilbert) + ... 2nd map: ggmap(map2) – Sitology

What is mapgilbert? ggmap does not take a data argument – Madrigalist

@RichardTelford, mapgilbert is a plot of the Gilbert Islands area. I have added the full code block for completeness. I have also tried the same code from scratch on another machine, adding the errors around version incompatibility. I hope this provides more clarity. I wondered if some of the error is around API keys, but this seems not to impact on the simple plot(mapgilbert) call, so perhaps not. – Amazonite

The question regarding mapgilbert, had been answered here. That is, are you using the latest versions of ggplot2 and ggmap? The question regarding the Rotorua map, see my earlier comment. What do you get with ggmap (map2)? – Sitology

mapgilbert code works on my computer (R version 3.3.2). – Madrigalist

@SandyMuspratt, I followed the link you provided. I reinstalled all of the packages (ggplot2, ggforce, ggmap ggrepel) using devtools versions. Restarted R-Studio and re-ran the code. Thankyou for you comments on this -- I assume that the tips to reinstall and use devtools were the solution. If you want to post an answer I would be happy to accept it. Thanks again. – Amazonite

Good to hear that it worked. But I don't think you need to install the github versions. That advice was relevant back in Nov 2016. In Jan 2017, the CRAN versions should have been sufficient. – Sitology

@SandyMuspratt. On my other machine I reinstalled the four packages above, restarted R and same error. I then installed devtools of ggplot2 and ggmap, restarted and the code worked. For what it is worth in response to your comment. Thanks. – Amazonite

Answer 1

This is probably the version error because your code runs perfectly on my machine (R 3.3.2). devtools::install_github("dkahle/ggmap") devtools::install_github("hadley/ggplot2")

You can download packages "devtools" and install ggmap and ggplot2 from github again.

Emelia