I want to add a background map (stored as a ggplot
object) to another ggplot map because some states have NA
's that I removed, so they are left out of the map. I used patchwork
to try to combine, but it only puts them side by side. I want the back_map
to go "under" p
.
library(ggplot2)
library(tidyverse)
library(mapdata)
library(patchwork)
library(dplyr)
MainStates <- map_data("state")
State_Name <- c("alabama","arkansas","arizona","california","colorado")
Sales <- c(100,200,250,275,310)
df2 <- data.frame(State_Name,Sales)
MergedStates <- inner_join(MainStates, df2, by = c("region" = "State_Name"))
back_map <- ggplot() geom_polygon(data=MainStates, aes(x=long, y=lat, group=group),
color="black", fill="white")
p <- ggplot() geom_polygon(data = MergedStates,
aes(x=long, y=lat, group=group),
fill = ifelse(MergedStates$Sales <=
mean(MergedStates$Sales),"red","green"), size = 0.2)
back_map
p
CodePudding user response:
Don't need to make a separate back_map
object. Background map goes first in the code like such:
p <- ggplot() geom_polygon(data = MainStates, aes(x=long, y=lat,
group=group),
color = "black", fill = "white")
geom_polygon(data = MergedStates,
aes(x=long, y=lat, group=group),
fill = ifelse(MergedStates$sngIYA <=
mean(MergedStates$sngIYA),"red","green"),
color = "black", size = 0.2)