I've installed the latest version of ggmap from the github repository using the following code:
devtools::install_github("dkahle/ggmap", ref = "tidyup")
I've enable the "Geocoding API" option, enabled billing and provided my Google API key. I then tried to rerun a code using the trek
function and plot the path on my map with geom_path
. This code was working a few months ago (June 2018), but now I get the error:
Error in FUN(X[[i]], ...) : object 'lon' not found
I then tried to run the example in the trek vignette and got the same error message. So, using the example in the vignette:
from <- "houston, texas"
to <- "waco, texas"
trek_df <- trek(from, to, structure = "route")
qmap("college station, texas", zoom = 8) +
geom_path(
aes(x = lon, y = lat), colour = "blue",
size = 1.5, alpha = .5,
data = trek_df, lineend = "round"
)
Error in FUN(X[[i]], ...) : object 'lon' not found
It seems that the problem arises when the function trek
is called. It should give a data frame (output="simple"
) or all of the geocoded information (output="all"
), but there is an empty dataframe:
> trek_df
# A tibble: 0 x 0
Is there something more I have to do with Google to enable this function to work? Thanks for your help.
The most probable reason is that you have not enabled the Directions API in the Google Console.
trek()
is calling the Directions API as you can see here:
> trek_df <- trek(from, to, structure = "route")
Source : https://maps.googleapis.com/maps/api/directions/json?origin=houston%2C%20texas&destination=waco%2C%20texas&mode=driving&units=metric&alternatives=false&key=xxx
qmap()
is calling (in that case) the Static and Geocode APIs:
> qmap("college station, texas", zoom = 8) +
+ geom_path(
+ aes(x = lon, y = lat), colour = "blue",
+ size = 1.5, alpha = .5,
+ data = trek_df, lineend = "round"
+ )
Source : https://maps.googleapis.com/maps/api/staticmap?center=college%20station,%20texas&zoom=8&size=640x640&scale=2&maptype=terrain&language=en-EN&key=xxx
Source : https://maps.googleapis.com/maps/api/geocode/json?address=college%20station%2C%20texas&key=xxx