get_distance_matrix: Build distance matrix from XY coordinates
In COVID-19-Mobility-Data-Network/mobility: Tools for Analyzing Human Mobility Data

Description Usage Arguments Value Author(s) See Also Examples

This function builds the pairwise distance matrix from vectors of XY coordinates and associated names.

1	get_distance_matrix(x, y, id)

`x`	vector giving X coordinates
`y`	vector giving Y coordinates
`id`	vector of names for each location

a named matrix of pairwise distances among locations

John Giles

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

n <- 5

xy <- data.frame(x=rnorm(n, -90, 1),
                 y=rnorm(n, 30, 1),
                 id=LETTERS[1:n])

D <- get_distance_matrix(x=xy[,1],
                         y=xy[,2],
                         id=xy[,3])


# From simulated travel data
xy <- get_unique_coords(travel_data_sim)
D <- get_distance_matrix(x=xy[,1],
                         y=xy[,2],
                         id=xy[,3])

D*111.35 # decimal degrees to km