Convert a dodgr graph into an equivalent sf::sfc object.

Convert a dodgr graph into a list composed of two objects: dat, a data.frame; and geometry, an sfc object from the (sf) package. Works by aggregating edges into LINESTRING objects representing longest sequences between all junction nodes. The resultant objects will generally contain more LINESTRING objects than the original sf object, because the former will be bisected at every junction point.

Usage

dodgr_to_sfc(graph)

Arguments

graph

A dodgr graph

Value

A list containing (1) A data.frame of data associated with the sf geometries; and (ii) A Simple Features Collection (sfc) list of LINESTRING objects.

Note

The output of this function corresponds to the edges obtained from dodgr_contract_graph. This function does not require the sf package to be installed; the corresponding function that creates a full sf object - dodgr_to_sf does requires sf to be installed.

See also

Other conversion: dodgr_deduplicate_graph(), dodgr_to_igraph(), dodgr_to_sf(), dodgr_to_tidygraph(), igraph_to_dodgr()

Examples

hw <- weight_streetnet (hampi)
nrow (hw)
#> [1] 6813
xy <- dodgr_to_sfc (hw)
dim (hw) # 5.845 edges
#> [1] 6813   16
length (xy$geometry) # more linestrings aggregated from those edges
#> [1] 744
nrow (hampi) # than the 191 linestrings in original sf object
#> [1] 236
dim (xy$dat) # same number of rows as there are geometries
#> [1] 744  16
# The dodgr_to_sf function then just implements this final conversion:
# sf::st_sf (xy$dat, geometry = xy$geometry, crs = 4326)