Get distance matrix for two different set of coordinates

Source: R/utils.R

Takes XY coordinates of two sets of locations and returns cross distance for all entries.

get_crossdist(xy1, xy2, id1 = NULL, id2 = NULL)

Arguments

xy1

two column matrix of XY coordinates for first group
xy2

two column matrix of XY coordinates for second group
id1

optional names for first group
id2

optional names for second group

Value

numeric scalar or vector

See also

Other data synthesis: get_distance_matrix(), get_mob_matrix(), get_stay_data()

Author

John Giles

Examples

# Some XY coords in decimal degrees
xy1 <- data.frame(x=rnorm(3, -90, 1),
                  y=rnorm(3, 30, 1),
                  id=LETTERS[1:3])

xy2 <- data.frame(x=rnorm(5, -90, 1),
                  y=rnorm(5, 35, 1),
                  id=LETTERS[4:8])

D <- get_crossdist(xy1=xy1[,1:2],
                   xy2=xy2[,1:2],
                   id1=xy1[,3],
                   id2=xy2[,3])
D

#>       destination
#> origin        D        E        F        G        H
#>      A 5.816628 4.685571 7.208011 6.189143 6.928941
#>      B 5.366823 4.439471 6.869588 5.842702 6.498575
#>      C 6.388676 6.123250 8.288208 7.260867 7.579013