leastcostpath (version 2.0.12)

update_values: 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)

Value

conductanceMatrix

Arguments

x

conductanceMatrix

sf

sf

FUN

function

Author

Joseph Lewis

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

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)})