Calculate Flow Distance and Dissimilarity — flow

This function calculates flow distance and dissimilarity measures between all pairs of flows based on the method described in @tao2016spatial.

Usage

flow_distance(x, alpha = 1, beta = 1)

Arguments

x: tibble with flow_ID, x, y, u, v, length_m
alpha: numeric, origin weight
beta: numeric, destination weight

Value

tibble of all OD pairs with fd, fds columns

References

Tao, R., Thill, J.-C., 2016. Spatial cluster detection in spatial flow data. Geographical Analysis 48, 355–372. https://doi.org/10.1111/gean.12100

Examples

flows <- sf::st_transform(flows_leeds, 3857)
flows <- head(flows, 100) # for testing
# Add flow lengths and coordinates
flows <- add_flow_length(flows)
flows <- add_xyuv(flows)
#> Extracting start and end coordinates from flow geometries...
#> Adding x, y, u, v columns to flow data...
#> Assigning unique flow IDs...
# Calculate distances
distances <- flow_distance(flows, alpha = 1.5, beta = 0.5)
#> Adding coordinates data back onto the unique pairs ...