dodgr_to_sfc
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.
dodgr_to_sfc(graph)
graph |
A |
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.
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.
Other conversion:
dodgr_to_igraph(),
dodgr_to_sf(),
dodgr_to_tidygraph(),
igraph_to_dodgr()
hw <- weight_streetnet (hampi) nrow(hw) xy <- dodgr_to_sfc (hw) dim (hw) # 5.845 edges length (xy$geometry) # more linestrings aggregated from those edges nrow (hampi) # than the 191 linestrings in original sf object dim (xy$dat) # same number of rows as there are geometries # The dodgr_to_sf function then just implements this final conversion: # sf::st_sf (xy$dat, geometry = xy$geometry, crs = 4326)
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