This function allows to calculate elevation statistics for polygons. For each polygon, the desired statistic(s) are returned.
Arguments
- engine
The preferred processing functions from either one of "zonal", "extract" or "exactextract" as character.
- stats
Function to be applied to compute statistics for polygons either one or multiple inputs as character "mean", "median" or "sd".
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)
mapme_options(
outdir = outdir,
verbose = FALSE
)
aoi <- system.file("extdata", "sierra_de_neiba_478140_2.gpkg",
package = "mapme.biodiversity"
) %>%
read_sf() %>%
get_resources(get_nasa_srtm()) %>%
calc_indicators(
calc_elevation(engine = "extract", stats = c("mean", "median", "sd", "var"))
) %>%
tidyr::unnest(elevation)
aoi
#> Simple feature collection with 1 feature and 9 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: 1 × 10
#> WDPAID NAME DESIG_ENG ISO3 assetid elevation_mean elevation_median
#> <dbl> <chr> <chr> <chr> <int> <dbl> <dbl>
#> 1 478140 Sierra de Neiba National… DOM 1 1704. 1702
#> # ℹ 3 more variables: elevation_sd <dbl>, elevation_var <dbl>,
#> # geom <POLYGON [°]>
# }