hf_accCost: Accumulated cost-distance

In kbvernon/rHike: Functions for Computing Hiking Efficiency and Velocity

Description

Calculates the accumulated cost of travel from one or more points.

Usage

hf_accCost(x, points, fun = function(x) 1/mean(x))

Arguments

x	A RasterLayer with velocity or efficiency values.
points	A POINT object from package sf specifying locations from which to calculate accumulated cost distance.
fun	A function to calculate transition weights from the raster.

Value

A RasterLayer with accumulated travel costs.

Examples

## Not run: 

library(raster)
library(rHike)
library(sf)

dem <- raster(system.file("extdata/slc.tif", package = "rHike"))

slope <- hf_slope(dem)

velocity <- hf_velocity(slope, hf = "campbell", decile = 30)

start_points <- st_sf(id = 1:3,
                      geometry = st_sfc(st_point(c(424350, 4514200)),
                                        st_point(c(426000, 4515000)),
                                        st_point(c(429000, 4516500)),
                                        crs = 26912))

acc_cost <- hf_accCost(velocity, start_points)

plot(acc_cost)
plot(st_geometry(start_points), color = "red", add = TRUE)


## End(Not run)

kbvernon/rHike documentation built on May 29, 2020, 7:22 p.m.