Build an 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.

Usage

adjacency(shp, epsg = 3857)

Arguments

shp

sf dataframe.

epsg

numeric EPSG code to planarize to. Default is 3857.

Value

Zero-indexed adjacency list with nrow(shp) entries.

Examples

data(precincts)
adj <- adjacency(precincts)