traveltime function

Calculate accessibility statistics

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.

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

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".

Returns

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

Details

The required resources for this indicator are:

• nelson_et_al

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_nelson_et_al(ranges = "100k_200k")) %>%
  calc_indicators(
    calc_traveltime(engine = "extract", stats = c("min", "max"))
  ) %>%
  portfolio_long()

aoi
## End(Not run)