flowdist {cartograflow}

Builds a continuous distance matrices from a spatial features background

Description

From a layer of areal spatial features, compute and threshold a continuous distance matrix. The result is either a matrice of distances between ODs, or a flow matrix based on the distance travelled between ODs ; both can be used for filtering flow before flow mapping (flowmap)

Usage

flowdist(tab, dist.method, result)

Arguments

tab

the input flow dataset

dist.method

distance calculation algorithm, default is euclidian calculation

result

Choose Building a "flowdist" or a simple "dist" matrice. See Details

Details

– result = "dist" is the simple resulting distance matrice.
– result = "flowdist" is the resulting distance matrice with additional calculated parameters.
– It is also possible to filter flow by a level of distance travelled.

Value

(1) A flowdata set with continuous distances calculations. See dist.method parameter

(2) A flowdata set with movement from euclidian distances calculations

Examples

library(cartograflow)
library(sf)
data(flowdata)
map <- st_read(system.file("shape/MGP_TER.shp", package = "cartograflow"))
tabflow <- flowjointure(
  geom = "area", bkg = map, DF.flow = flows, origin = "i",
  destination = "j", id = "EPT_NUM", x = "X", y = "Y"
)

# Format long with only origin, destination and distance parameters:
tab.distance <- flowdist(tabflow, dist.method = "euclidian", result = "dist")
# Format long with with all parameters: coordinates, distance, mouvement
tab.distance <- flowdist(tabflow, dist.method = "euclidian", result = "flowdist")