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,
message = TRUE,
...
)
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
|
message |
Should informational messages (those messages that are
neither warnings nor errors) be printed when constructing the network?
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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