sfnetwork  R Documentation 
sfnetwork
is a tidy data structure for geospatial networks. It
extends the tbl_graph
data structure for
relational data into the domain of geospatial networks, with nodes and
edges embedded in geographical space, and offers smooth integration with
sf
for spatial data analysis.
sfnetwork( nodes, edges = NULL, directed = TRUE, node_key = "name", edges_as_lines = NULL, length_as_weight = FALSE, force = FALSE, ... )
nodes 
The nodes of the network. Should be an object of class

edges 
The edges of the network. May be an object of class

directed 
Should the constructed network be directed? Defaults to

node_key 
The name of the column in the nodes table that character
represented 
edges_as_lines 
Should the edges be spatially explicit, i.e. have

length_as_weight 
Should the length of the edges be stored in a column
named 
force 
Should network validity checks be skipped? Defaults to

... 
Arguments passed on to 
An object of class sfnetwork
.
library(sf, quietly = TRUE) ## Create sfnetwork from sf objects p1 = st_point(c(7, 51)) p2 = st_point(c(7, 52)) p3 = st_point(c(8, 52)) nodes = st_as_sf(st_sfc(p1, p2, p3, crs = 4326)) e1 = st_cast(st_union(p1, p2), "LINESTRING") e2 = st_cast(st_union(p1, p3), "LINESTRING") e3 = st_cast(st_union(p3, p2), "LINESTRING") edges = st_as_sf(st_sfc(e1, e2, e3, crs = 4326)) edges$from = c(1, 1, 3) edges$to = c(2, 3, 2) # Default. sfnetwork(nodes, edges) # Undirected network. sfnetwork(nodes, edges, directed = FALSE) # Using character encoded from and to columns. nodes$name = c("city", "village", "farm") edges$from = c("city", "city", "farm") edges$to = c("village", "farm", "village") sfnetwork(nodes, edges, node_key = "name") # Spatially implicit edges. sfnetwork(nodes, edges, edges_as_lines = FALSE) # Store edge lenghts in a weight column. sfnetwork(nodes, edges, length_as_weight = TRUE) # Adjust the number of features printed by active and inactive components oldoptions = options(sfn_max_print_active = 1, sfn_max_print_inactive = 2) sfnetwork(nodes, edges) options(oldoptions)
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