spdep_contiguity_swm: constructs spatial weight matrices based on contiguity

In sdsfun: Spatial Data Science Complementary Features

constructs spatial weight matrices based on contiguity

Description

Constructs spatial weight matrices based on contiguity via spdep package.

Usage

spdep_contiguity_swm(
  sfj,
  queen = TRUE,
  k = NULL,
  order = 1L,
  cumulate = TRUE,
  style = "W",
  zero.policy = TRUE
)

Arguments

sfj	An sf object or can be converted to sf by sf::st_as_sf().
queen	(optional) if TRUE, using queen contiguity, otherwise rook contiguity. Default is TRUE.
k	(optional) The number of nearest neighbours. Ignore this parameter when not using distance based neighbours to construct spatial weight matrices.
order	(optional) The order of the adjacency object. Default is 1.
cumulate	(optional) Whether to accumulate adjacency objects. Default is TRUE.
style	(optional) style can take values W, B, C, and S. More to see spdep::nb2mat(). Default is W.
zero.policy	(optional) if FALSE stop with error for any empty neighbour sets, if TRUE permit the weights list to be formed with zero-length weights vectors. Default is TRUE.

Value

A matrix

Note

When k is set to a positive value, using K-Nearest Neighbor Weights.

Examples

gzma = sf::read_sf(system.file('extdata/gzma.gpkg',package = 'sdsfun'))
wt1 = spdep_contiguity_swm(gzma, k = 6, style = 'B')
wt2 = spdep_contiguity_swm(gzma, queen = TRUE, style = 'B')
wt3 = spdep_contiguity_swm(gzma, queen = FALSE, order = 2, style = 'B')

sdsfun documentation built on April 3, 2025, 8:39 p.m.