spatial_edge_measures  R Documentation 
These functions are a collection of specific spatial edge measures, that
form a spatial extension to edge measures in
tidygraph
.
edge_azimuth() edge_circuity(Inf_as_NaN = FALSE) edge_length() edge_displacement()
Inf_as_NaN 
Should the circuity values of loop edges be stored as

Just as with all query functions in tidygraph, spatial edge
measures are meant to be called inside tidygraph verbs such as
mutate
or filter
, where
the network that is currently being worked on is known and thus not needed
as an argument to the function. If you want to use an algorithm outside of
the tidygraph framework you can use with_graph
to
set the context temporarily while the algorithm is being evaluated.
A numeric vector of the same length as the number of edges in the graph.
edge_azimuth
: The angle in radians between a straight
line from the edge startpoint pointing north, and the straight line from
the edge startpoint and the edge endpoint. Calculated with
st_geod_azimuth
. Requires a geographic CRS.
edge_circuity
: The ratio of the length of an edge
linestring geometry versus the straightline distance between its boundary
nodes, as described in Giacomin &
Levinson, 2015. DOI: 10.1068/b130131p.
edge_length
: The length of an edge linestring geometry
as calculated by st_length
.
edge_displacement
: The straightline distance between the two
boundary nodes of an edge, as calculated by st_distance
.
library(sf, quietly = TRUE) library(tidygraph, quietly = TRUE) net = as_sfnetwork(roxel) net %>% activate("edges") %>% mutate(azimuth = edge_azimuth()) net %>% activate("edges") %>% mutate(circuity = edge_circuity()) net %>% activate("edges") %>% mutate(length = edge_length()) net %>% activate("edges") %>% mutate(displacement = edge_displacement())
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