Build Adjacency List

This mimics redist's redist.adjacency using GEOS to create the patterns, rather than sf. This is faster than that version, but forces projections.

adjacency(shp, epsg = 3857)

Arguments

shp

sf dataframe

epsg

numeric EPSG code to planarize to. Default is 3857.

Value

list with nrow(shp) entries

Examples

data(precincts)
adj <- adjacency(precincts)