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Clip the first and last n metres of SpatialLines

Source: R/toptail.R
geo_toptail.Rd

Takes lines and removes the start and end point, to a distance determined by the user.

Usage

geo_toptail(l, toptail_dist, ...)

Arguments

l

An sf object representing lines

toptail_dist

The distance (in metres) to top and tail the line by. Can either be a single value or a vector of the same length as the SpatialLines object.

...

Arguments passed to sf::st_buffer()

Details

Note: see the function toptailgs() in stplanr v0.8.5 for an implementation that uses the geosphere package.

See also

Other lines: angle_diff(), is_linepoint(), line2df(), line2points(), line_bearing(), line_breakup(), line_midpoint(), line_segment(), line_segment1(), line_via(), mats2line(), n_segments(), n_vertices(), onewaygeo(), points2line(), toptail_buff()

Examples

lib_versions <- sf::sf_extSoftVersion()
lib_versions
#>           GEOS           GDAL         proj.4 GDAL_with_GEOS     USE_PROJ_H 
#>       "3.12.1"        "3.8.4"        "9.4.0"         "true"         "true" 
#>           PROJ 
#>        "9.4.0" 
# dont test due to issues with sp classes on some set-ups
if (lib_versions[3] >= "6.3.1") {
  l <- routes_fast_sf[2:4, ]
  l_top_tail <- geo_toptail(l, 300)
  l_top_tail
  plot(sf::st_geometry(l_top_tail))
  plot(sf::st_geometry(geo_toptail(l, 600)), lwd = 9, add = TRUE)
}