R将颜色标度与ggmap中的GPS时间戳相关联

时间:2015-05-18 15:57:02

标签: r gps ggmap

我在R中使用ggmap将gps坐标绘制到地图上。目前这些点都是相同的颜色 - 红色。是否可以将颜色与时间戳相关联 - 即创建一个梯度来显示旅行方向?

我目前使用的代码是:

    install.packages("ggplot2")
    install.packages("ggmap")
    install.packages("RgoogleMaps")
    # ggplot2 and ggmap packages installed
    setwd("C:/Users/afpe6c/Dropbox/EPSRC PostDoc/GPS Tracker/GPS & accelerometer testing/15-5-15/")
    # this sets the working directory in which the csv file is located
    gps = read.csv("15-5-15 1030-1040 gps range test lat long.csv", header = TRUE)
    library(ggmap)
    # set map base and center on median lon and lat
    mapImageData <- get_googlemap(center = c(lon = median(gps$lon), lat =        median(gps$lat)),zoom = 17,size = c(500, 500),maptype = c("satellite"))                              
    ggmap(mapImageData,extent = "device") + geom_point(aes(x = lon,y = lat),data = gps,colour = "red",size = 1,pch = 20)

以下是我正在使用的csv文件中的一行数据: “_id”,LON,时间戳,LAT 5555c11465bc7d11180bc36c,-4.018596666666666,2015-05-15T09:49:08.328Z,53.2394

有什么想法吗?

由于

0 个答案:

没有答案