Query sf attributes from the active element of a sfnetwork — sf_attr • sfnetworks

Query sf attributes from the active element of a sfnetwork

sf_attr(x, name, active = NULL)

Arguments

x: An object of class sfnetwork.
name: Name of the attribute to query. Either 'sf_column' or 'agr'.
active: Which network element (i.e. nodes or edges) to activate before extracting. If NULL, it will be set to the current active element of the given network. Defaults to NULL.

Value

The value of the attribute matched, or NULL if no exact match is found.

Details

sf attributes include sf_column (the name of the sf column) and agr (the attribute-geometry-relationships).

Examples

net = as_sfnetwork(roxel)
sf_attr(net, "agr", active = "edges")
#> from   to name type 
#> <NA> <NA> <NA> <NA> 
#> Levels: constant aggregate identity
sf_attr(net, "sf_column", active = "nodes")
#> [1] "geometry"