update_values {leastcostpath}

update values in a conductanceMatrix

Description

Apply a function to values in the conductanceMatrix that coincide with the supplied sf object

Usage

update_values(x, sf, FUN)

Arguments

x

conductanceMatrix

sf

sf

FUN

function

Details

An updated conductanceMatrix is produced by assessing which areas of the conductanceMatrix coincide with the supplied sf object. The values within the areas that coincide with the sf object are modified based on the supplied function

Value

conductanceMatrix

Author(s)

Joseph Lewis

Examples

r <- terra::rast(system.file("extdata/SICILY_1000m.tif", package="leastcostpath"))

slope_cs <- create_slope_cs(x = r, cost_function = "tobler", neighbours = 4)

locs <- sf::st_sf(geometry = sf::st_sfc(
sf::st_point(c(960745, 4166836)),
crs = terra::crs(r)))

locs <- sf::st_buffer(x = locs, dist = 25000)

slope_cs2 <- update_values(x = slope_cs, sf = locs, 
FUN = function(j) { j * 0.6})

slope_cs3 <- update_values(x = slope_cs, sf = locs, 
FUN = function(j) { j + 10})

slope_cs4 <- update_values(x = slope_cs, sf = locs, 
FUN = function(j) { replace(x = j, values = 0)})