The number of points will be double the number of lines with `line2points`

. A
closely related function, `line2pointsn`

returns all the points that were
line vertices. The points corresponding with a given line, `i`

, will be
`(2*i):((2*i)+1)`

. The last function, `line2vertices`

, returns all the points
that are vertices but not nodes. If the input `l`

object is composed by only
1 LINESTRING with 2 POINTS, then it returns an empty `sf`

object.

## Arguments

- l
An

`sf`

object or a`SpatialLinesDataFrame`

from the older`sp`

package- ids
Vector of ids (by default

`1:nrow(l)`

)

## See also

Other lines:
`angle_diff()`

,
`geo_toptail()`

,
`is_linepoint()`

,
`line2df()`

,
`line_bearing()`

,
`line_breakup()`

,
`line_midpoint()`

,
`line_segment()`

,
`line_segment1()`

,
`line_via()`

,
`mats2line()`

,
`n_segments()`

,
`n_vertices()`

,
`onewaygeo()`

,
`points2line()`

,
`toptail_buff()`

## Examples

```
l <- routes_fast_sf[2, ]
lpoints <- line2points(l)
plot(l$geometry)
plot(lpoints, add = TRUE)
# test all vertices:
plot(l$geometry)
lpoints2 <- line2pointsn(l)
plot(lpoints2$geometry, add = TRUE)
# extract only internal vertices
l_internal_vertices <- line2vertices(l)
plot(sf::st_geometry(l), reset = FALSE)
plot(l_internal_vertices, add = TRUE)
# The boundary points are missing
```