mean_center: Mean Center

In centr: Weighted and Unweighted Spatial Centers

Mean Center

Description

Mean center calculates the geographic average center. One can specify the groups to calculate individual centers for groups and weights for each individual point. It is analagous to the ArcGIS Pro Mean Center tool.

If st_is_longlat(x), mean center is calculated assuming a spherical Earth. Projected data is calculated assuming a "flat" Earth.

Usage

mean_center(x, group, weight, ...)

Arguments

x	Input POINT or POLYGON simple features
group	column name(s) specifying groups to calculate individual mean centers for
weight	name of numeric weight column specifying an individual point's contribution to the mean center
...	expressions passed to dplyr::summarise()

Value

An sf object with a mean center for each group

Examples

df <- data.frame(
  lon = c(20, 50, 30, 80, 10),
  lat = c(25, 70, 30, 50, 30),
  grp = c("a", "b", "a", "b", "a"),
  wt = c(1, 5, 1, 3, 2)
)
x <- sf::st_as_sf(df, coords = c("lon", "lat"), crs = 4326)
mean_center(x, group = "grp", weight = "wt")

x |>
  dplyr::group_by(grp) |>
  mean_center(weight = "wt")

centr documentation built on June 8, 2025, 11:36 a.m.