window_lsm

Moving window

Usage

window_lsm(
  landscape,
  window,
  level = "landscape",
  metric = NULL,
  name = NULL,
  type = NULL,
  what = NULL,
  progress = FALSE,
  ...
)

Arguments

landscape: A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.
window: Moving window matrix.
level: Level of metrics. Either 'patch', 'class' or 'landscape' (or vector with combination).
metric: Abbreviation of metrics (e.g. 'area').
name: Full name of metrics (e.g. 'core area')
type: Type according to FRAGSTATS grouping (e.g. 'aggregation metrics').
what: Selected level of metrics: either "patch", "class" or "landscape". It is also possible to specify functions as a vector of strings, e.g. what = c("lsm_c_ca", "lsm_l_ta").
progress: Print progress report.
...: Arguments passed on to calculate_lsm().

Value

list

Details

The function calculates for each focal cell the selected landscape metrics (currently only landscape level metrics are allowed) for a local neighbourhood. The neighbourhood can be specified using a matrix. For more details, see ?terra::focal(). The result will be a RasterLayer in which each focal cell includes the value of its neighbourhood and thereby allows to show gradients and variability in the landscape (Hagen-Zanker 2016). To be type stable, the actual result is always a nested list (first level for RasterStack layers, second level for selected landscape metrics).

Note, that in situations when the moving window does not contain any patches, the result is NA.

References

Fletcher, R., Fortin, M.-J. 2018. Spatial Ecology and Conservation Modeling: Applications with R. Springer International Publishing. 523 pages

Hagen-Zanker, A. (2016). A computational framework for generalized moving windows and its application to landscape pattern analysis. International journal of applied earth observation and geoinformation, 44, 205-216.

McGarigal K., SA Cushman, and E Ene. 2023. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical Maps. Computer software program produced by the authors; available at the following web site: https://www.fragstats.org

Examples

if (FALSE) { # \dontrun{
landscape <- terra::rast(landscapemetrics::landscape)
landscape_stack <- c(landscape, landscape)
window <- matrix(1, nrow = 5,ncol = 5)
window_lsm(landscape, window = window, what = c("lsm_l_pr", "lsm_l_joinent"))
window_lsm(landscape_stack, window = window, what = c("lsm_l_pr", "lsm_l_joinent"))

window_circular <- matrix(c(NA, 1, NA, 1, 1, 1, NA, 1, NA), nrow = 3, ncol = 3)
window_lsm(landscape, window = window_circular, what = c("lsm_l_pr", "lsm_l_joinent"))
} # }