Create a link layer from a data.frame of links and an sf object.
mf_get_links(x, df, x_id, df_id)Arguments
- x
an sf object, a simple feature collection.
- df
a data.frame that contains identifiers of starting and ending points.
- x_id
name of the identifier variable in x, default to the first column (optional)
- df_id
names of the identifier variables in df, character vector of length 2, default to the two first columns. (optional)
Value
An sf object is returned, it is composed of df and the sfc (LINESTRING) of links.
Examples
mtq <- mf_get_mtq()
mob <- read.csv(system.file("csv/mob.csv", package = "mapsf"))
# Select links from Fort-de-France (97209))
mob_97209 <- mob[mob$i == 97209, ]
# Create a link layer
mob_links <- mf_get_links(x = mtq, df = mob_97209)
# Plot the links
mf_map(mtq)
mf_map(mob_links, col = "red4", lwd = 2, add = TRUE)
