Match Across Geographic Layers

geo_match(from, to, method = "center", tiebreaker = TRUE, epsg = 3857)

Arguments

from: smaller geographic level to match up from
to: larger geographic level to be matched to
method: string from center, centroid, point, or area for matching method
tiebreaker: Should ties be broken? boolean. If FALSE, precincts with no matches get value -1 and precincts with multiple matches get value -2.
epsg: numeric EPSG code to planarize to. Default is 3857.

Value

Integer Vector of matches length(to) with values in 1:nrow(from)

Examples

library(dplyr)
data(checkerboard)
counties <- sf::st_as_sf(as.data.frame(rbind(
  sf::st_union(checkerboard %>% filter(i < 4)),
  sf::st_union(checkerboard %>% filter(i >= 4))
)))

geo_match(from = checkerboard, to = counties)
#> Warning: Planarizing skipped. `x` missing CRS.
#> Warning: Planarizing skipped. `x` missing CRS.
#>  [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2
#> [39] 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
geo_match(from = checkerboard, to = counties, method = 'area')
#> Warning: Planarizing skipped. `x` missing CRS.
#>  [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2
#> [39] 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2