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.

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

Examples

data(flowlines) islp <- is_linepoint(flowlines) nrow(flowlines)
#> [1] 49
sum(islp)
#> [1] 7
# Remove invisible 'linepoints' nrow(flowlines[!islp, ])
#> [1] 42