Identify lines that are points

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.

Usage

is_linepoint(l)

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_segment1(), line_segment(), 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