st_as_nodes {sfdep}

Convert to a node point object

Description

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().

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.

Value

An object of class sf with POINT geometry.

Examples

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