swash (version 1.2.2)

nbmatrix: 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
  )

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

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

Author

Thomas Wieland

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.

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. 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. tools:::Rd_expr_doi("https://doi.org/10.48088/ejg.t.wie.13.4.018.033")

See Also

nbstat

Examples

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

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