CODEWITHSUNDEEP
rggplot2gisspatialr-sf
AuthenticSporks
AuthenticSporks

Reputation: 73

Geom_points not being drawn on ggplot map

I'm trying to overlay several points on a map I've created from a shapefile (downloaded at this link). I'm using the sf package to draw my maps and am able to get get the following map.

first.map<-ggplot()+ 
  geom_sf(data = shp)+
  ggtitle("First Map")

enter image description here
As you can see, this works fine, but when I try to overlay my points, I get the following results.

second.map<-ggplot()+ 
  geom_sf(data = shp)+
  geom_point(data=locations, aes(long,lat),inherit.aes = F)+
  ggtitle("Second Map")

enter image description here
I think this has something to do with how sf is interpreting the coordinates for my points, but I can't figure out how to get my point coordinates into what R wants me to. Below are the coordinates that I'm trying to overlay. I'm not super experienced with working with this type of data so any help would be appreciated.

locations<-data.frame(id=c(1,2,3,4,5),
                      long=c(96.73872,96.69264,96.69264,96.69250,96.68029),
                      lat=c(43.52769,43.53598,43.53598,43.54669,43.53585))

Upvotes: 2

Views: 657

Answers (1)

Quixotic22
Quixotic22

Reputation: 2924

This isn't a strength of mine so was curious to play too.

I got it to work like this,

  • converting the locations to an sf object
  • transforming the shape to have the same crs
  • editing the location longitude by adding *-1 in the input data to swap from west to east

Keen to hear better practices from others but this should get you going.

shp <- st_read("Subdivisions/Subdivisions.shp")

locations<-data.frame(id=c(1,2,3,4,5),
        long=c(96.73872,96.69264,96.69264,96.69250,96.68029)*-1,
        lat=c(43.52769,43.53598,43.53598,43.54669,43.53585))


locations_g <- st_as_sf(locations, coords = c("long", "lat"), crs = 4326)
shp2 <- st_transform(shp, 4326)

ggplot()+ 
  geom_sf(data = shp2)+
  geom_sf(data=locations_g)+
  ggtitle("Second Map")

Upvotes: 3

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