Convert to a node point object

Given geometry and a neighbor list, creates an sf object to be used as nodes in an sfnetworks::sfnetwork(). If the provided geometry is a polygon, sf::st_point_on_surface() will be used to create the node point.

Usage

st_as_nodes(x, nb)

# S3 method for class 'sf'
st_as_nodes(x, nb)

# S3 method for class 'sfc'
st_as_nodes(x, nb)

Arguments

x

object of class sf or sfc.

nb

a neighbor list. If x is class sf, the unquote named of the column. If x is class sfc, an object of class nb as created from st_contiguity().

Value

An object of class sf with POINT geometry.

Details

st_as_node() adds a row i based on the attribute "region.id" in the nb object. If the nb object is created with sfdep, then the values will always be row indexes.

Examples

if (requireNamespace("dplyr", quitly = TRUE)) {
library(magrittr)
guerry %>%
  dplyr::transmute(nb = st_contiguity(geometry)) %>%
  st_as_nodes(nb)
 }