Project Points to Line Geometry — gProject • rgeos

Return distances along geometry to points nearest the specified points.

gProject(spgeom, sppoint, normalized = FALSE)

Arguments

spgeom: SpatialLines or SpatialLinesDataFrame object
sppoint: SpatialPoints or SpatialPointsDataFrame object
normalized: Logical determining if normalized distances should be used

Value

a numeric vector containing the distances along the line to points nearest to the specified points

Details

If normalized=TRUE, distances normalized to the length of the geometry are returned, i.e., values between 0 and 1.

See also

gInterpolate

Author

Rainer Stuetz

Examples

l <- readWKT("LINESTRING(0 1, 3 4, 5 6)")
p1 <- readWKT("MULTIPOINT(3 2, 3 5)")
frac <- gProject(l, p1)
p2 <- gInterpolate(l, frac)
plot(l, axes=TRUE)
plot(p1, col = "blue", add = TRUE)
plot(p2, col = "red", add = TRUE)