OD matrices often contain 'intrazonal' flows, where the origin is the same point as the
destination. This function can help identify such intrazonal OD pairs, using 2 criteria:
the total number of vertices (2 or fewer) and whether the origin and destination are the same.
Arguments
- l
A spatial lines object
Details
Returns a boolean vector. TRUE means that the associated line is in fact a point
(has no distance). This can be useful for removing data that will not be plotted.
See also
Other lines:
angle_diff(),
geo_toptail(),
line2df(),
line2points(),
line_bearing(),
line_breakup(),
line_midpoint(),
line_segment(),
line_segment1(),
line_via(),
mats2line(),
n_segments(),
n_vertices(),
onewaygeo(),
points2line(),
toptail_buff()
Examples
islp <- is_linepoint(flowlines_sf)
nrow(flowlines_sf)
#> [1] 42
sum(islp)
#> [1] 0
# Remove invisible 'linepoints'
nrow(flowlines_sf[!islp, ])
#> [1] 42
