CODEWITHSUNDEEP
rggplot2data-visualization
Harry McLellan
Harry McLellan

Reputation: 93

ggplot on ggmap with coloured point dependent on value

My data set denotes the location (lat, long) of bee hives and how many in that location are positive for a parasite.

plotting the locations on a map is fine but I would like to change the colours of the points that have a parasite presence e.g. heading 'Positive' > 0

I have tried the following code but I can't + to a map it tells me it can't add 0 to a plot

myMap + ggplot(honeybee, aes(x= Long, y= Lat)) + 
  geom_point(aes(colour = cut(Positive, c(-1, 0, 5))), size = 1) +
  scale_color_manual( values = c("red", "black"), 
                     name = "Parasite", labels = c("Absent", "Present"))

Essentially I want the above code fitted to a ggmap

Upvotes: 4

Views: 424

Answers (1)

dmi3kno
dmi3kno

Reputation: 3045

I am not sure where you get your map, since you did not include the data, but here's how you could do it with ggmap. There's no need to call ggplot again. Just include your honeybee datasource directly in the layer

library(ggmap)
m <- get_map("New York City", zoom=14,maptype="toner",source="stamen")
myMap <- ggmap(m)
honeybee <- data.frame(Lat=runif(20,min=40.69, max=40.73),
                       Long=runif(20, min=-74.03, max=-73.98),
                       Positive = rnorm(20)) 


myMap + 
  geom_point(data=honeybee, 
             mapping=aes(x= Long, y= Lat, colour = Positive>0), 
             size = 5) +
  scale_color_manual( values = c("red", "yellow"), 
                      name = "Parasite", 
                      labels = c("Absent", "Present"))

Which produces honeybee

Upvotes: 4

Related Questions