我刚开始学习R语言,尝试创建一个显示康涅狄格州每个镇学生人数的地图。我有一个包含地点和招生信息的.csv文件,格式如下:
name lon lat resStudent
1 ANDOVER -72.37472 41.73278 657
2 ANSONIA -73.07900 41.34621 2999
3 ASHFORD -72.12162 41.87307 736
4 AVON -72.83052 41.80962 3563
5 BARKHAMSTED -72.97222 41.92917 680
6 BEACON FALLS -73.06176 41.44265 1039
7 BERLIN -72.78064 41.61460 3165
8 BETHANY -72.99250 41.42556 1028
9 BETHEL -73.41396 41.37123 3034
10 BETHLEHEM -73.20861 41.63917 490
11 BLOOMFIELD -72.73336 41.83945 2484
我已经能够使用以下代码生成我想要将此信息叠加到上面的地图:
tempMap <- get_openstreetmap(bbox = c(left = -73.8, bottom = 40.9, right = -71.7, top = 42.1), scale = 829486, color = "bw")
ggmap(tempMap)
我在将两者结合时遇到了问题。以下是我使用的代码:
enrollData<-read.csv("enrollData.csv")
enrollMap <- tempMap + geom_point(data = enrollData,aes(x = lon, y = lat, size = resStudent)
运行后,我收到一个错误消息,内容如下:
Error in Ops.raster(tempMap, geom_point(data = enrollData, aes(x = lon, :
Operator not meaningful for raster objects
有没有解决这个问题的想法?
ggmap(tempMap) + geom_point(data = enrollData,aes(x = lon, y = lat, size = resStudent)
? - johannes