Getting a map with points, using ggmap and ggplot2

Question

I want a map with points (and other geom_* layers) on it. I get the map, but instead of the points all I get is a warning:

Message d'avis :
Removed 3 rows containing missing values (geom_point).

Here is a reproducible exemple:

library(ggmap)
library(ggplot2)

d <- data.frame(lat=c(50.659631, 50.607213, 50.608129),
                lon=c(3.09319, 3.011473, 3.031529))

Lille <- get_map("Lille,France", zoom=12)

p <- ggmap(Lille)
p <- p + geom_point(data=d, aes(lat, lon))
p

Looking in the output of

ggplot_build(p)

I see a layer with NAs for x and y, but I do not get why the data from d is not considered.

When using ggplot() instead of ggmap(), I do get the points. But I do need the map too :)

So, how can I get a map with points over it?

Thanks

juba · Accepted Answer · 2013-02-25 15:07:47Z

27

It seems you just inverted longitude and latitude :

p <- ggmap(Lille)
p + geom_point(data=d, aes(x=lon, y=lat), color="red", size=30, alpha=0.5)

enter image description here

answered Feb 25, 2013 at 15:07

juba

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3 Comments

Costin Over a year ago

Yeah, I was sure that there is a simple solution :)

juba Over a year ago

@Costin Please accept Didzis Elferts' answer instead of mine, I think he answered first.

Costin Over a year ago

OK, I see your message listed first, but if you say so I'll accept his answer. You must be in the same second, I guess :)

Didzis Elferts · Accepted Answer · 2013-02-25 15:24:24Z

24

Your longitude and latitude values in geom_point() are in wrong order. lon should be as x values and lat as y values.

 p + geom_point(data=d, aes(x=lon, y=lat),size=5)

edited Feb 25, 2013 at 15:24

answered Feb 25, 2013 at 15:07

Didzis Elferts

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