st_line_project_point {sf}

Project point on linestring, interpolate along a linestring

Description

Project point on linestring, interpolate along a linestring

Usage

st_line_project(line, point, normalized = FALSE)

st_line_interpolate(line, dist, normalized = FALSE)

Arguments

line

object of class sfc with LINESTRING geometry

point

object of class sfc with POINT geometry

normalized

logical; if TRUE, use or return distance normalised to 0-1

dist

numeric, vector with distance value(s)

Details

arguments line, point and dist are recycled to common length when needed

Value

st_line_project returns the distance(s) of point(s) along line(s), when projected on the line(s)

st_line_interpolate returns the point(s) at dist(s), when measured along (interpolated on) the line(s)

Examples

st_line_project(st_as_sfc("LINESTRING (0 0, 10 10)"), st_as_sfc(c("POINT (0 0)", "POINT (5 5)")))
st_line_project(st_as_sfc("LINESTRING (0 0, 10 10)"), st_as_sfc("POINT (5 5)"), TRUE)
st_line_interpolate(st_as_sfc("LINESTRING (0 0, 1 1)"), 1)
st_line_interpolate(st_as_sfc("LINESTRING (0 0, 1 1)"), 1, TRUE)