Map with latitude and longitude for a variable

[Borbottio98]

Hi,
My dataset refers to accidents that there were in america in 2019.
I have a variable with 3 factors (Severity of accidents) and I want to show in a graph to show how the frequency of this variable change according to latitude and longitude, but i'm not able to do a map.
What can i do?

[lars]

Hi,

Can you provide a reprex to illustrate what you're trying to achieve?

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…

I suspect the following chapter is not what you're looking for, but maybe the R Graphics Cookbook can help you also further?

13.17 Creating a Map | R Graphics Cookbook, 2nd edition

[Borbottio98]

Hi,
Thank you for your answer, I solved some minutes ago with this code:

usa <- map_data("usa")
ggplot() + geom_polygon(data = usa, aes(x=long, y = lat, group = group),fill="NA",col="black")  +
  coord_fixed(1.3)+  geom_point(data=dati, aes(x=Start_Lng, y=Start_Lat,col=Severity))+
  labs(title = "Fig.6 Map of accidents in America",fill = "Severity") + theme(plot.title = element_text(hjust = 0.5))