stplanr (version 0.4.1)

line_match: Match two sets of lines based on similarity

Description

This function is a wrapper around gDistance that matches lines based on the Hausdorff distance

Usage

line_match(l1, l2, threshold = 0.01, return_sp = FALSE)

Arguments

l1

A spatial object

l2

A spatial object

threshold

The threshold for a match - distances greater than this will not count as matches

return_sp

Should the function return a spatial result (FALSE by default)

See Also

Other lines: angle_diff(), geo_toptail(), is_linepoint(), line2df(), line2points(), line_bearing(), line_midpoint(), line_sample(), line_segment(), line_via(), mats2line(), n_sample_length(), n_vertices(), onewaygeo(), onewayid(), points2line(), toptail_buff(), toptailgs(), update_line_geometry()

Examples

# NOT RUN {
x1 <- 2:4
x2 <- 3:5
match(x1, x2) # how the base function works
l1 <- flowlines[2:4, ]
l2 <- routes_fast[3:5, ]
(lmatches <- line_match(l1, l2)) # how the stplanr version works
l2matched <- l2[lmatches[!is.na(lmatches)], ]
plot(l1)
plot(l2, add = TRUE)
plot(l2matched, add = TRUE, col = "red") # showing matched routes
l2matched2 <- line_match(l1, l2, return_sp = TRUE)
identical(l2matched, l2matched2)
# decreasing the match likelihood via the threshold
line_match(l1, l2, threshold = 0.003)
# }