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This is a function required in overline(). It identifies whether sets of lines overlap (beyond shared points) or not.
overline()
islines(g1, g2)
A spatial object
Other rnet: gsection(), overline(), rnet_breakup_vertices(), rnet_group()
gsection()
rnet_breakup_vertices()
rnet_group()
if (FALSE) { # sf implementation islines(routes_fast_sf[2, ], routes_fast_sf[3, ]) islines(routes_fast_sf[2, ], routes_fast_sf[22, ]) }
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