adding ggplot to ggmap

Question

I have the following graph:

dat<-data.frame(name=c("a","b","c"), x=1:3, y=1:3)
ggplot(dat, aes(x=x, y=y))+
geom_point(aes(shape=paste(1:3,": point",name)))+
geom_text(aes(x=x,y=y+0.07), label=1:3)+
scale_shape_manual(values=rep(1,3))+
labs(shape="locations")

I need to add the points to ggmap, however when i get rid of ggplot and start with : geom_point(dat, aes(x=x, y=y,shape=paste(1:3,": point",name)))+

I get an error"Error: Discrete value supplied to continuous scale"

ggplot(dat, ...) defines dat as the default dataset, referenced in all the following geom_* calls. If you move that to geom_point(data=dat,...), then geom_text(...) does not know what to use for data. Can you provide a more complete question which shows the use of ggmap(....) — jlhoward
geom_point(dat, aes(x=x, y=y,shape=paste(1:3,": point",name)))+ geom_text(dat, ,aes(x=x,y=y+0.07), label=1:3)+ scale_shape_manual(values=rep(1,3))+ labs(shape="locations") I get an error that "Discrete value supplied to continuous scale" — yuliaUU

Paulo E. Cardoso Paulo E. Cardoso · Accepted Answer · 2014-06-06T20:06:31

library(ggmap)
library(ggplot2)


lis <- get_map("Lisbon,Portugal", zoom=12)

p <- ggmap(lis)

d <- data.frame(lon=c(-9.20, -9.20, -9.12),
                lat=c(38.65, 38.80, 38.75),
                loc = c('p1', 'p2', 'p3'))

p + geom_point(data=d, aes(x=lon, y=lat),
               colour = 'red', size = 8, alpha = .6) +
  geom_text(aes(label=loc), data=d, hjust=-1,
            fontface = 'bold')

enter image description here

Not sure if this is close to your needs. You should provide further details on how your data relates to ggmap (providing coordinates maybe?)

adding ggplot to ggmap

1 Answers