Creates a Linestring from point, multipoint, or line geometries.

Lines can be created from point aggregates (using summarise) or from -- to to create a 2-vertex line.

st_makeline(.geom, .to, ...)

Arguments

.geom	A geometry or a set of geometries of class sfc to be converted to line. The geometries are often aggregated using a dplyr::group_by() followed by adplyr::summarise().
.to	A point geometry to create pairwise lines.
...	Unused.

Value

A line (LINESTRING) of class sfc.

See also

Other make: st_makepoint, st_multi, st_numpoints

Examples

library(dplyr)
#> 
#> Attaching package: ‘dplyr’
#> The following objects are masked from ‘package:stats’:
#> 
#>     filter, lag
#> The following objects are masked from ‘package:base’:
#> 
#>     intersect, setdiff, setequal, union
library(tibble)

x <- tibble(g = c("a", "a"), point = c(st_point(12, 21), st_point(21, 12)))
x %>%
 summarise(line = st_makeline(point))
#> # A tibble: 1 x 1
#>             line
#>     <LINESTRING>
#> 1 (12 21, 21 12)