Calculate neighbor distances

From an nb list and point geometry, return a list of distances for each observation's neighbors list.

Usage

st_nb_dists(x, nb, longlat = NULL)

Arguments

x

an object of class sfc.

nb

a neighbor list for example created by st_contiguity()

longlat

TRUE if point coordinates are longitude-latitude decimal degrees, in which case distances are measured in kilometers. See ?spdep::nbdists() for more.

Value

a list where each element is a numeric vector.

Details

Utilizes spdep::nbdists() for distance calculation.

See also

Other weights: st_inverse_distance(), st_kernel_weights(), st_weights()

Examples

geo <- sf::st_geometry(guerry)
nb <- st_contiguity(geo)
dists <- st_nb_dists(geo, nb)
#> ! Polygon provided. Using point on surface.

head(dists)
#> [[1]]
#> [1] 90030.63 87399.28 55587.69 85693.43
#> 
#> [[2]]
#> [1]  85221.38  75937.49 125737.35  86797.26 102272.51 105519.50
#> 
#> [[3]]
#> [1]  85460.95  92562.86  96614.50  88010.48  66400.10 111763.74
#> 
#> [[4]]
#> [1] 53294.18 98250.20 83762.06 83973.87
#> 
#> [[5]]
#> [1] 53294.18 86812.56 91755.83
#> 
#> [[6]]
#> [1]  67062.90  96221.69 107959.75 108017.90  54530.02  75976.27 110723.87
#>