Line midpoints
The function onverts SpatialLinesDataFrame to SpatialPointsDataFrame with points at the midpoints of the line segments.
SpatialLinesMidPoints(sldf)
sldf |
A SpatialLines or SpatialLinesDataFrame object |
The function builds a SpatialPointsDataFrame from the midpoints of Line objects belonging to Lines objects in an object inheriting from a Spatial Lines object. The output data slot contains an index variable showing which Lines object the midpoints belong to.
A SpatialPointsDataFrame object created from the input object.
Jonathan Callahan, modified by Roger Bivand
xx <- readShapeLines(system.file("shapes/fylk-val.shp", package="maptools")[1],
proj4string=CRS("+proj=utm +zone=33 +datum=WGS84"))
plot(xx, col="blue")
spdf <- SpatialLinesMidPoints(xx)
plot(spdf, col="orange", add=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.