
Calculate mangrove extent based on Global Mangrove Watch (GMW)
Source:R/calc_mangroves_area.R
mangroves_area.Rd
This function allows to efficiently calculate area of mangrove from Global Mangrove Watch - World Conservation Monitoring Centre (WCMC) for polygons. For each polygon, the area of the mangrove (in hectare) for desired year is returned. The required resources for this indicator are:
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 = c(1996, 2016),
outdir = outdir,
tmpdir = tempdir(),
add_resources = FALSE,
verbose = FALSE
) %>%
get_resources("gmw") %>%
calc_indicators("mangroves_area") %>%
tidyr::unnest(mangroves_area)
#> Skipping existing files in output directory.
#> Translating shapefiles to GeoPackages. This may take a while....
aoi
#> Simple feature collection with 2 features and 7 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 × 8
#> WDPAID NAME DESIG_ENG ISO3 assetid mangrove_extent year
#> <dbl> <chr> <chr> <chr> <int> <dbl> <chr>
#> 1 478140 Sierra de Neiba National Park DOM 1 0 1996
#> 2 478140 Sierra de Neiba National Park DOM 1 0 2016
#> # ℹ 1 more variable: geom <POLYGON [°]>
# }