patch_areas {graph4lg} | R Documentation |
Extract patch areas from a categorical raster
Description
The function extracts patch areas from a categorical raster
Usage
patch_areas(raster, class, edge_size = 0, neighborhood = 8, surf_min = 0)
Arguments
raster |
A RasterLayer object corresponding to a categorical raster layer |
class |
An integer value or vector with the value(s) corresponding to the code values of the raster layer within which points will be sampled. are computed. |
edge_size |
An integer value indicating the width of the edge (in meters) of the raster layer which is ignored during the sampling (default = 0). It prevents from sampling in the margins of the study area. |
neighborhood |
An integer value indicating which cells are considered
adjacent when contiguous patches are delineated (it should be 8
(default, Queen's case) or 4 (Rook's case)). This parameter is ignored
when |
surf_min |
An integer value indicating the minimum surface of a patch
considered for the sampling in number of raster cells. This parameter is used
whatever the |
Value
A data.frame with the areas of the patches
Author(s)
P. Savary