Concentration calculation

Calculates the concentration, which is the sum of all observations within a circle of a certain radius.

concentration(
  sub,
  full,
  value,
  lon_sub = lon,
  lat_sub = lat,
  lon_full = lon,
  lat_full = lat,
  radius = 200,
  display_progress = TRUE
)

Arguments

sub

data.frame of target points to calculate concentration risk for, including at least columns for longitude and latitude.

full

data.frame containing reference points, where the function finds locations within a radius from the target points. Should include at least columns for longitude, latitude, and the value of interest to summarize.

value

column name with value of interest to summarize in full.

lon_sub

column name in sub for longitude (default is lon).

lat_sub

column name in sub for latitude (default is lat).

lon_full

column name in full for longitude in full (default is lon).

lat_full

column name in full for latitude in full (default is lat).

radius

numeric. Radius of the circle in meters (default is 200).

display_progress

boolean indicating whether to show progress bar (TRUE/FALSE). Defaults to TRUE.

Value

A data.frame equal to sub including an additional column concentration.

Author

Martin Haringa

Examples

df <- data.frame(location = c("p1", "p2"), lon = c(6.561561, 6.561398),
 lat = c(53.21369, 53.21326))
concentration(df, Groningen, value = amount, radius = 100)
#>   location      lon      lat concentration
#> 1       p1 6.561561 53.21369           775
#> 2       p2 6.561398 53.21326          2271