我正在尝试使用 R 绘制我的坐标。我已经尝试遵循不同的帖子（R：在世界地图上绘制分组坐标 https://stackoverflow.com/questions/16234092/r-plot-grouped-coordinates-on-world-map ; 在R中的谷歌地图上绘制多个点的坐标 https://stackoverflow.com/questions/14095495/ploting-coordinates-of-multiple-points-at-google-map-in-r）但我的数据并没有取得太大成功。
我试图用我的 GPS 坐标作为彩色点来实现世界平面地图（每个区域都有特定的颜色）：
area lat long
Agullhas -38,31 40,96
Polar -57,59 76,51
Tasmanian -39,47 108,93
library(RgoogleMaps)
lat <- c(-38.31, -35.50) #define our map's ylim
lon <- c(40.96,37.50) #define our map's xlim
center = c(mean(lat), mean(lon)) #tell what point to center on
zoom <- 2 #zoom: 1 = furthest out (entire globe), larger numbers = closer in
terrmap <- GetMap(center=center, zoom=zoom, maptype= "satallite", destfile = "satallite.png")
问题是现在我不知道如何添加我的点，我会喜欢每个区域一种颜色。
有人可以帮助我继续下去吗？
我尝试过的另一个选择是：
library(maps)
library(mapdata)
library(maptools)
map(database= "world", ylim=c(-38.31, -35.5), xlim=c(40.96, 37.5), col="grey80", fill=TRUE, projection="gilbert", orientation= c(90,0,225))
lon <- c(-38.31, -35.5) #fake longitude vector
lat <- c(40.96, 37.5) #fake latitude vector
coord <- mapproject(lon, lat, proj="gilbert", orientation=c(90, 0, 225)) #convert points to projected lat/long
points(coord, pch=20, cex=1.2, col="red") #plot converted points
但坐标以错误的位置结束，我不知道为什么
希望有人可以帮忙
作为替代方案RgoogleMaps，您还可以使用组合ggplot2 with ggmap.
有了这个代码：
# loading the required packages
library(ggplot2)
library(ggmap)
# creating a sample data.frame with your lat/lon points
lon <- c(-38.31,-35.5)
lat <- c(40.96, 37.5)
df <- as.data.frame(cbind(lon,lat))
# getting the map
mapgilbert <- get_map(location = c(lon = mean(df$lon), lat = mean(df$lat)), zoom = 4,
maptype = "satellite", scale = 2)
# plotting the map with some points on it
ggmap(mapgilbert) +
geom_point(data = df, aes(x = lon, y = lat, fill = "red", alpha = 0.8), size = 5, shape = 21) +
guides(fill=FALSE, alpha=FALSE, size=FALSE)
you get this result:
