Value
a [tmap::tmap-element], supposed to be stacked after [tmap::tm_shape()] using the `+` operator. The `opt_<layer_function>` function returns a list that should be passed on to the `options` argument.
Examples
library(tmap)
library(sfnetworks)
sfn = as_sfnetwork(roxel)
tm_shape(sfn) +
tm_network()
tm_shape(sfn) +
tm_edges(col = "type", lwd = 4) +
tm_nodes()