mapme.biodiversity (version 0.9.2)

gsw_transitions: Calculate Global Surface Water (GSW) Transitions

Description

GSW transition data contains information about the type of surface water change for each pixel. The raster files have integer cell values between [0, 10] that code for different transition classes:

Usage

calc_gsw_transitions()

Value

A function that returns an indicator tibble with transition classes as variable and corresponding areas (in ha) as value.

Details

Value	Transition Class
1	Permanent
2	New Permanent
3	Lost Permanent
4	Seasonal
5	New Seasonal
6	Lost Seasonal
7	Seasonal to Permanent
8	Permanent to Seasonal
9	Ephemeral Permanent
10	Ephemeral Seasonal

To aggregate, we sum up the area of each transition class for a given region.

The required resources for this indicator are:

• global_surface_water_transitions

Examples

# \dontshow{
mapme.biodiversity:::.copy_resource_dir(file.path(tempdir(), "mapme-data"))
# }
if (FALSE) {
library(sf)
library(mapme.biodiversity)

outdir <- file.path(tempdir(), "mapme-data")
dir.create(outdir, showWarnings = FALSE)

mapme_options(
  outdir = outdir,
  verbose = FALSE
)

aoi <- system.file("extdata", "shell_beach_protected_area_41057_B.gpkg",
  package = "mapme.biodiversity"
) %>%
  read_sf() %>%
  get_resources(get_global_surface_water_transitions()) %>%
  calc_indicators(calc_gsw_transitions()) %>%
  portfolio_long()

aoi
}