nbmatrix: Construct Neighbourhood Matrix from Polygons
In swash: Swash-Backwash Model for the Single Epidemic Wave

nbmatrix

R Documentation

Construct Neighbourhood Matrix from Polygons

Description

Building a neighbourhood matrix based on regions (polygons) with contiguous boundaries and resulting a data frame

Usage

nbmatrix(
  polygon_sf, 
  ID_col,
  row.names = NULL
  )

Arguments

`polygon_sf`	`sf` object with polygons
`ID_col`	Column of `polygon_sf` with unique ID of each polygon
`row.names`	row.names for the `sf` object

Details

The function is based on spdep::poly2nb, which creates neighbours lists. The input is a sf object (spatial data frame) and the results are 1) a nb list (poly2nb result) and 2) a data.frame.

Value

list with two entries:

`nb`:	Object of class `"sb"` Neighbours list; see the `spdep:poly2nb` documentation
`nbmat`:	Object of class `"data.frame"` Dataset neighbouring regions

Author(s)

Thomas Wieland

References

Wieland T (2020) Flatten the Curve! Modeling SARS-CoV-2/COVID-19 Growth in Germany at the County Level. REGION 7(2), 43–83. \Sexpr[results=rd]{tools:::Rd_expr_doi("https://doi.org/10.18335/region.v7i2.324")}

Wieland T (2022) Spatial patterns of excess mortality in the first year of the COVID-19 pandemic in Germany. European Journal of Geography 13(4), 18-33. \Sexpr[results=rd]{tools:::Rd_expr_doi("https://doi.org/10.48088/ejg.t.wie.13.4.018.033")}

Examples

data(RKI_Corona_counties)
# German counties (Source: Robert Koch Institute)

Corona_nbmat <- 
  nbmatrix (
    RKI_Corona_counties, 
    ID_col="AGS"
  )
# Creating neighborhood matrix

swash documentation built on Aug. 8, 2025, 7:14 p.m.