Find points within a circle around a center coordinate — points_in

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

Usage

points_in_circle(
  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, longitude of the circle center.
lat_center: Numeric scalar, latitude of the circle center.
lon: Name of the longitude column in data.
lat: Name of the latitude column in data.
radius: Numeric, circle radius in meters. Default is 200.
sort: Logical, if TRUE (default) results are sorted by distance from the center (closest first). If FALSE, the order of data is preserved.

Value

A data frame subset of data with an extra column distance_m giving the distance to the center point.

Author

Martin Haringa

Examples

points_in_circle(Groningen, lon_center = 6.571561, lat_center = 53.21326,
radius = 60)
#> # A tibble: 3 × 10
#>   street    number letter suffix postal_code city    lon   lat amount distance_m
#>   <chr>      <int> <chr>  <chr>  <chr>       <chr> <dbl> <dbl>  <dbl>      <dbl>
#> 1 Heresing…      5 NA     NA     9711EP      Gron…  6.57  53.2      5       31.4
#> 2 Heresing…     11 NA     NA     9711ER      Gron…  6.57  53.2     11       47.8
#> 3 Zuiderpa…   1003 NA     NA     9724AK      Gron…  6.57  53.2   1003       57.6