treecover_area {mapme.biodiversity}

Calculate treecover statistics

Description

This functions allows to efficiently calculate treecover statistics for polygons. For each year in the analysis timeframe, the forest losses in preceding and the current years are subtracted from the treecover in the year 2000 and actual treecover figures within the polygon are returned.

Usage

calc_treecover_area(years = 2000:2020, min_size = 10, min_cover = 35)

Arguments

years

A numeric vector with the years for which to calculate treecover area.

min_size

The minimum size of a forest patch to be considered as forest in ha.

min_cover

The minimum cover percentage per pixel to be considered as forest.

Details

The required resources for this indicator are:

• gfw_treecover

• gfw_lossyear

Value

A function that returns a tibble with a column for years and treecover (in ha).

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", "sierra_de_neiba_478140_2.gpkg",
  package = "mapme.biodiversity"
) %>%
  read_sf() %>%
  get_resources(
    get_gfw_treecover(version = "GFC-2022-v1.10"),
    get_gfw_lossyear(version = "GFC-2022-v1.10")
  ) %>%
  calc_indicators(calc_treecover_area(years = 2016:2017, min_size = 1, min_cover = 30)) %>%
  tidyr::unnest(treecover_area)

aoi

## End(Not run)