根据值设置点的颜色

Question

我有一个如下所示的数据框：

x1= c("Station 1", "Station 2", "Station 3", "Station 4", "Station 5", "Station 6")
x2= c(58.73, 57.20, 41.90, 38.00, 47.10, 67.30)
x3= c(16.55, -2.10, 8.80, 23.70, 24.50, 14.40)
x4= c(342, 1900, 283, 832, 212, 1533)
x5= c("rual", "rual", "urban", "suburban", "rual", "urban")

testframe = data.frame(Station=x1, LAT=x2, LON=x3, ALT=x4, AREA=x5)

我想用 3 种不同的颜色显示点。绿色代表农村，黄色代表郊区，红色代表城市。

但到现在为止我只能用一种颜色显示它们。我这样做了：

library(ggmap)
library(ggplot2)

Europe = get_map(location = "Europe", zoom = 4)

p = ggmap(Europe)
p = p + geom_point(data=testframe, aes(x=testframe$LON, y=testframe$LAT), color = "red", size=1)
p

有人可以帮帮我吗？

Answer 1

您可以尝试以下方法：

p +
  geom_point(data = testframe, aes(LON, LAT, color = AREA), size = 10) +
  scale_color_manual(name = "AREA", values = cols)

或copy/paste这段代码：

library(ggmap)
library(ggplot2)

x1 <- c("Station 1", "Station 2", "Station 3", "Station 4", "Station 5", "Station 6")
x2 <- c(58.73, 57.20, 41.90, 38.00, 47.10, 67.30)
x3 <- c(16.55, -2.10, 8.80, 23.70, 24.50, 14.40)
x4 <- c(342, 1900, 283, 832, 212, 1533)
x5 <- c("rual", "rual", "urban", "suburban", "rual", "urban")

testframe <- data.frame(
  Station = x1,
  LAT = x2,
  LON = x3,
  ALT = x4,
  AREA = x5
)

Europe <- get_map(location = "Europe", zoom = 4)

cols <- c(
  "rual" = "darkgreen",
  "suburban" = "yellow",
  "urban" = "red"
)

p <- ggmap(Europe)

p +
  geom_point(data = testframe, aes(LON, LAT, color = AREA), size = 10) +
  scale_color_manual(name = "AREA", values = cols)

根据值设置点的颜色

Set color of point depending on a value

r

coordinates

ggplot2

conditional-statements

ggmap