Question

我正在阅读csv文件，我想使用文件中提到的经度和纬度来绘制地点。这些地方的温度也在csv中提到，我想用该温度值绘制热图。我已经在变量st中读取了csv文件，并创建了一个提取纬度，经度和温度的数据帧。我正在绘制地图并创建热图。我已将温度作为stat_density2d中的数据传递。我得到错误＆＃34; ggplot2不知道如何处理类整数的数据＆＃34; 以下是代码：

library(ggmap)
st <- read.csv("C:/Python27/csv/daily.csv")
longitude <- st$longitude
latitude <- st$latitude
temperature <- st$temperature

df <- data.frame(longitude,latitude,temperature)
houston <- get_map(location = c(lon = st$longitude[1], lat = st$latitude[1]), zoom = 6)

ggmap(houston)


 ggmap(houston) + 
  # make the heatmap
      stat_density2d(aes(x = longitude, 
                 y = latitude, 
                 fill = ..level.., # value corresponding to discretized density estimates 
                 alpha = ..level..),
             bins = 2,  # number of bands
             data <- df[,3] ,
             geom = "polygon") + coord_fixed(xlim = c(-119,-121),ylim = c(35,37),ratio=1/1)+
  scale_fill_gradient(low = "yellow", high = "red") +
  scale_alpha(range = c(.25, .55)) + 
  theme(legend.position="none")

示例csv文件如下所示：

Name,latitude,longitude,temperature,
Five Points,36.34,-120.11,
Shafter/USDA,35.53,-119.28,
Firebaugh/Telles,36.85,-120.59,
Stratford,36.16,-119.85,67,
Kettleman,35.87,-119.89,50,
Parlier,36.60,-119.50,73,
Blackwells Corner,35.65,-119.96,70,
Los Banos,37.01,-120.76,75,
Fresno State,36.82,-119.74,0,
Westlands,36.63,-120.38,69,

在尝试使用ggplot绘制地图时，显示的错误是ggplot不知道如何处理类整数的数据

0 个答案: