points_within_radius: Find points within radius around one or more centre...

In spatialrisk: Spatial Concentration and Radius-Based Risk Calculations

Find points within radius around one or more centre coordinates

Description

This function selects rows from a data frame whose longitude/latitude coordinates fall within a given radius (in meters) from one or more specified centre points. It also calculates the distance of each point to the centre.

Usage

points_within_radius(
  data,
  lon_center,
  lat_center,
  lon = "lon",
  lat = "lat",
  radius = 200,
  sort = TRUE
)

Arguments

data	A data frame containing at least longitude and latitude columns.
lon_center	Numeric scalar or vector, longitude(s) of the circle centre(s).
lat_center	Numeric scalar or vector, latitude(s) of the circle centre(s).
lon	A string with the name of the longitude column in 'data'.
lat	A string with the name of the latitude column in 'data'.
radius	Numeric, circle radius in meters. Default is 200.
sort	Logical, if 'TRUE' results are sorted by distance within each centre.

Value

A data frame subset of 'data' with an extra column 'distance_m' and if multiple centres are provided, also a column 'center_index'.

spatialrisk documentation built on Oct. 16, 2026, 5:09 p.m.