update_values: update values in a conductanceMatrix

In josephlewis/leastcostpath: Modelling Pathways and Movement Potential Within a Landscape

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)})

josephlewis/leastcostpath documentation built on Oct. 18, 2023, 2:03 p.m.