Get a link layer from a data.frame of links

Create a link layer from a data.frame of links and an sf object.

Usage

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)