Calculate treeloss statistics — treecover_area_and

This functions allows to efficiently calculate the treecover and emissions indicators in a single function call together. Since most of the pre-processing operations for treecover and emissions are the same, it is more efficient to calculate them in one run if users are actually interested in both statistics. Otherwise users are advised to use the respective single indicator functions. The required resources for this indicator are:

Format

A tibble with a column for years, treecover (in ha), and emissions (in Mg CO2)

Details

The following arguments can be set:

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.

Examples

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

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

aoi <- system.file("extdata", "sierra_de_neiba_478140_2.gpkg",
  package = "mapme.biodiversity"
) %>%
  read_sf() %>%
  init_portfolio(
    years = 2016:2017,
    outdir = outdir,
    tmpdir = tempdir(),
    add_resources = FALSE,
    verbose = FALSE
  ) %>%
  get_resources(
    resources = c("gfw_treecover", "gfw_lossyear", "gfw_emissions"),
    vers_treecover = "GFC-2021-v1.9", vers_lossyear = "GFC-2021-v1.9"
  ) %>%
  calc_indicators("treecover_area_and_emissions", min_size = 1, min_cover = 30) %>%
  tidyr::unnest(treecover_area_and_emissions)

aoi
#> Simple feature collection with 2 features and 8 fields
#> Geometry type: POLYGON
#> Dimension:     XY
#> Bounding box:  xmin: -71.80933 ymin: 18.57668 xmax: -71.33201 ymax: 18.69931
#> Geodetic CRS:  WGS 84
#> # A tibble: 2 × 9
#>   WDPAID NAME            DESIG_ENG     ISO3  assetid years emissions treecover
#>    <dbl> <chr>           <chr>         <chr>   <int> <int>     <dbl>     <dbl>
#> 1 478140 Sierra de Neiba National Park DOM         1  2016     2832.    12011.
#> 2 478140 Sierra de Neiba National Park DOM         1  2017     3468.    11939.
#> # ℹ 1 more variable: geom <POLYGON [°]>
# }