gsw_transitions: Calculate Global Surface Water (GSW) Transitions

In mapme.biodiversity: Efficient Monitoring of Global Biodiversity Portfolios

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()

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

Value

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

Examples

## Not run: 
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

## End(Not run)

mapme.biodiversity documentation built on Nov. 5, 2025, 7:32 p.m.