check_polygon_contiguity {geomander}

Check Polygon Contiguity

Description

Cast shp to component polygons, build the adjacency, and check the contiguity. Avoids issues where a precinct is actually a multipolygon

Usage

check_polygon_contiguity(shp, group, epsg = 3857)

Arguments

shp

An sf data frame

group

unquoted name of group identifier in shp. Typically, this is district assignment. If you're looking for dis-contiguous precincts, this should be a row number.

epsg

numeric EPSG code to planarize to. Default is 3857.

Value

tibble with a column for each of inputted group, created group number, and the identified connected component number

Examples

data(checkerboard)
check_polygon_contiguity(checkerboard, i)