mapme.biodiversity (version 0.9.1)

traveltime: Calculate accessibility statistics

Description

Accessibility is the ease with which larger cities can be reached from a certain location. This function allows to efficiently calculate accessibility statistics (i.e. travel time to nearby major cities) for polygons. For each polygon, the desired statistic/s (mean, median or sd) is/are returned.

Usage

calc_traveltime(engine = "extract", stats = "mean")

Value

A function that returns an indicator tibble with city ranges and statisics as variable and corresponding values (in minutes) as value.

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 single or multiple inputs as character. Supported statistics are: "mean", "median", "sd", "min", "max", "sum" "var".

Details

The required resources for this indicator are:

• nelson_et_al

Examples

# \dontshow{
mapme.biodiversity:::.copy_resource_dir(file.path(tempdir(), "mapme-data"))
# }
if (FALSE) {
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_nelson_et_al(ranges = "100k_200k")) %>%
  calc_indicators(
    calc_traveltime(engine = "extract", stats = c("min", "max"))
  ) %>%
  portfolio_long()

aoi
}