This function returns the bearing (in degrees relative to north) of lines.
Arguments
- l
A spatial lines object
- bidirectional
Should the result be returned in a bidirectional format? Default is FALSE. If TRUE, the same line in the oposite direction would have the same bearing
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(),
is_linepoint(),
line2df(),
line2points(),
line_breakup(),
line_midpoint(),
line_segment(),
line_via(),
mats2line(),
n_vertices(),
onewaygeo(),
points2line(),
toptail_buff()
Examples
lib_versions <- sf::sf_extSoftVersion()
lib_versions
#> GEOS GDAL proj.4 GDAL_with_GEOS USE_PROJ_H
#> "3.10.2" "3.4.1" "8.2.1" "true" "true"
#> PROJ
#> "8.2.1"
# fails on some systems (with early versions of PROJ)
if (lib_versions[3] >= "6.3.1") {
bearings_sf_1_9 <- line_bearing(flowlines_sf[1:5, ])
bearings_sf_1_9 # lines of 0 length have NaN bearing
line_bearing(flowlines_sf[1:5, ], bidirectional = TRUE)
}
#> [1] NaN 87.950582 77.554344 36.163396 6.668455