strata_centroids: Partition coordinates by strata and find mean coordinates
In dyerlab/scape: Convienence Functions for Geospatial Data Analysis (Title Case)

This function partitions the data.frame or tibble into subgroups and returns the names and centroids of the strata.

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strata_centroids(data, stratum = "Population", longitude = "Longitude",
  latitude = "Latitude", mode = c("data.frame", "SpatialPoints",
  "sf")[1])

`data`	A data frame object with coordinates and a column to be used as stratum designations.
`stratum`	The name of the column to use as the partition.
`longitude`	The name of the column with the X-coordinate (default = Longitude)
`latitude`	The name of the column with the Y-coordinate (default = Latitude)
`mode`	The format of the returned object as a data.frame (default), spatialPoints or sf object.