Aggregate Values Up to a Larger Geography — geo_estimate

Aggregate values from a smaller geography to a larger geography after matching each row of from to a row of to. This is commonly used to roll block-level counts up to precincts or districts.

Usage

geo_estimate_up(from, to, value, method = "center", epsg = 3857)

Arguments

from: Smaller geography level.
to: Larger geography level.
value: Numeric vector of length nrow(from) to aggregate. Defaults to 1.
method: Matching method passed to geo_match().
epsg: numeric EPSG code to planarize to. Default is 3857.

Value

numeric vector of length nrow(to) with values aggregated by group

Details

Groups in to with no matched rows are included in the output and receive 0.

Examples

library(dplyr)
set.seed(1)
data(checkerboard)
counties <- checkerboard |>
  group_by(id <= 32) |>
  summarize(geometry = sf::st_union(geometry)) |>
  mutate(pop = c(100, 200))
geo_estimate_up(from = checkerboard, to = counties, value = checkerboard$i)
#> Warning: Planarizing skipped. `x` missing CRS.
#> Warning: Planarizing skipped. `x` missing CRS.
#> [1] 176  48