[R] Plot a path

[Rui Barradas]

Hello,

The following uses ggplot2.

First, make up a dataset, since you have not posted one.



lat0 <- 38.736946
lon0 <- -9.142685
n <- 10

set.seed(1)
Date <- seq(Sys.Date() - n + 1, Sys.Date(), by = "days")
Lat <- lat0 + cumsum(c(0, runif(n - 1)))
Lon <- lon0 + cumsum(c(0, runif(n - 1)))
Placename <- rep(c("A", "B"), n/2)

path <- data.frame(Date, Placename, Lat, Lon)
path <- path[order(path$Date), ]


Now, two graphs, one with just one line of all the lon/lat and the other 
with a line for each Placename.

library(ggplot2)

ggplot(path, aes(x = Lon, y = Lat)) +
   geom_point() +
   geom_line()


ggplot(path, aes(x = Lon, y = Lat, colour = Placename)) +
   geom_point(aes(fill = Placename)) +
   geom_line()


Hope this helps,

Rui Barradas

Às 21:27 de 31/10/2018, Ferri Leberl escreveu:
> 
> Dear All,
> I have a dataframe with four cols: Date, Placename, geogr. latitude, geogr. longitude.
> How can I plot the path as a line, ordered by the date, with the longitude as the x-axis and the latitude as the y-axis?
> Thank you in advance!
> Yours, Ferri
> 
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